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@@ -1494,3 +1494,13 @@ vllm/lib/python3.10/site-packages/torchvision/image.so filter=lfs diff=lfs merge
 vllm/lib/python3.10/site-packages/torchvision/_C.so filter=lfs diff=lfs merge=lfs -text
 vllm/lib/python3.10/site-packages/tokenizers/tokenizers.abi3.so filter=lfs diff=lfs merge=lfs -text
 vllm/lib/python3.10/site-packages/rpds/rpds.cpython-310-x86_64-linux-gnu.so filter=lfs diff=lfs merge=lfs -text
+vllm/lib/python3.10/site-packages/imageio/plugins/__pycache__/_tifffile.cpython-310.pyc filter=lfs diff=lfs merge=lfs -text
+vllm/lib/python3.10/site-packages/av.libs/libavutil-6eb452c3.so.59.39.100 filter=lfs diff=lfs merge=lfs -text
+vllm/lib/python3.10/site-packages/av.libs/libxml2-c46e7314.so.2.9.13 filter=lfs diff=lfs merge=lfs -text
+vllm/lib/python3.10/site-packages/av.libs/libgssapi_krb5-497db0c6.so.2.2 filter=lfs diff=lfs merge=lfs -text
+vllm/lib/python3.10/site-packages/charset_normalizer/md__mypyc.cpython-310-x86_64-linux-gnu.so filter=lfs diff=lfs merge=lfs -text
+vllm/lib/python3.10/site-packages/av.libs/libmp3lame-3ecc6556.so.0.0.0 filter=lfs diff=lfs merge=lfs -text
+vllm/lib/python3.10/site-packages/av.libs/libopus-21bd4123.so.0.10.1 filter=lfs diff=lfs merge=lfs -text
+parrot/lib/python3.10/site-packages/scipy/fftpack/convolve.cpython-310-x86_64-linux-gnu.so filter=lfs diff=lfs merge=lfs -text
+parrot/lib/python3.10/site-packages/scipy/stats/_stats_pythran.cpython-310-x86_64-linux-gnu.so filter=lfs diff=lfs merge=lfs -text
+parrot/lib/python3.10/site-packages/scipy/stats/tests/__pycache__/test_stats.cpython-310.pyc filter=lfs diff=lfs merge=lfs -text

parrot/lib/python3.10/site-packages/scipy/cluster/__init__.py

@@ -0,0 +1,31 @@
+"""
+=========================================
+Clustering package (:mod:`scipy.cluster`)
+=========================================
+
+.. currentmodule:: scipy.cluster
+
+.. toctree::
+   :hidden:
+
+   cluster.vq
+   cluster.hierarchy
+
+Clustering algorithms are useful in information theory, target detection,
+communications, compression, and other areas. The `vq` module only
+supports vector quantization and the k-means algorithms.
+
+The `hierarchy` module provides functions for hierarchical and
+agglomerative clustering.  Its features include generating hierarchical
+clusters from distance matrices,
+calculating statistics on clusters, cutting linkages
+to generate flat clusters, and visualizing clusters with dendrograms.
+
+"""
+__all__ = ['vq', 'hierarchy']
+
+from . import vq, hierarchy
+
+from scipy._lib._testutils import PytestTester
+test = PytestTester(__name__)
+del PytestTester

parrot/lib/python3.10/site-packages/scipy/cluster/tests/hierarchy_test_data.py

@@ -0,0 +1,145 @@
+from numpy import array
+
+
+Q_X = array([[5.26563660e-01, 3.14160190e-01, 8.00656370e-02],
+             [7.50205180e-01, 4.60299830e-01, 8.98696460e-01],
+             [6.65461230e-01, 6.94011420e-01, 9.10465700e-01],
+             [9.64047590e-01, 1.43082200e-03, 7.39874220e-01],
+             [1.08159060e-01, 5.53028790e-01, 6.63804780e-02],
+             [9.31359130e-01, 8.25424910e-01, 9.52315440e-01],
+             [6.78086960e-01, 3.41903970e-01, 5.61481950e-01],
+             [9.82730940e-01, 7.04605210e-01, 8.70978630e-02],
+             [6.14691610e-01, 4.69989230e-02, 6.02406450e-01],
+             [5.80161260e-01, 9.17354970e-01, 5.88163850e-01],
+             [1.38246310e+00, 1.96358160e+00, 1.94437880e+00],
+             [2.10675860e+00, 1.67148730e+00, 1.34854480e+00],
+             [1.39880070e+00, 1.66142050e+00, 1.32224550e+00],
+             [1.71410460e+00, 1.49176380e+00, 1.45432170e+00],
+             [1.54102340e+00, 1.84374950e+00, 1.64658950e+00],
+             [2.08512480e+00, 1.84524350e+00, 2.17340850e+00],
+             [1.30748740e+00, 1.53801650e+00, 2.16007740e+00],
+             [1.41447700e+00, 1.99329070e+00, 1.99107420e+00],
+             [1.61943490e+00, 1.47703280e+00, 1.89788160e+00],
+             [1.59880600e+00, 1.54988980e+00, 1.57563350e+00],
+             [3.37247380e+00, 2.69635310e+00, 3.39981700e+00],
+             [3.13705120e+00, 3.36528090e+00, 3.06089070e+00],
+             [3.29413250e+00, 3.19619500e+00, 2.90700170e+00],
+             [2.65510510e+00, 3.06785900e+00, 2.97198540e+00],
+             [3.30941040e+00, 2.59283970e+00, 2.57714110e+00],
+             [2.59557220e+00, 3.33477370e+00, 3.08793190e+00],
+             [2.58206180e+00, 3.41615670e+00, 3.26441990e+00],
+             [2.71127000e+00, 2.77032450e+00, 2.63466500e+00],
+             [2.79617850e+00, 3.25473720e+00, 3.41801560e+00],
+             [2.64741750e+00, 2.54538040e+00, 3.25354110e+00]])
+
+ytdist = array([662., 877., 255., 412., 996., 295., 468., 268., 400., 754.,
+                564., 138., 219., 869., 669.])
+
+linkage_ytdist_single = array([[2., 5., 138., 2.],
+                               [3., 4., 219., 2.],
+                               [0., 7., 255., 3.],
+                               [1., 8., 268., 4.],
+                               [6., 9., 295., 6.]])
+
+linkage_ytdist_complete = array([[2., 5., 138., 2.],
+                                 [3., 4., 219., 2.],
+                                 [1., 6., 400., 3.],
+                                 [0., 7., 412., 3.],
+                                 [8., 9., 996., 6.]])
+
+linkage_ytdist_average = array([[2., 5., 138., 2.],
+                                [3., 4., 219., 2.],
+                                [0., 7., 333.5, 3.],
+                                [1., 6., 347.5, 3.],
+                                [8., 9., 680.77777778, 6.]])
+
+linkage_ytdist_weighted = array([[2., 5., 138., 2.],
+                                 [3., 4., 219., 2.],
+                                 [0., 7., 333.5, 3.],
+                                 [1., 6., 347.5, 3.],
+                                 [8., 9., 670.125, 6.]])
+
+# the optimal leaf ordering of linkage_ytdist_single
+linkage_ytdist_single_olo = array([[5., 2., 138., 2.],
+                                   [4., 3., 219., 2.],
+                                   [7., 0., 255., 3.],
+                                   [1., 8., 268., 4.],
+                                   [6., 9., 295., 6.]])
+
+X = array([[1.43054825, -7.5693489],
+           [6.95887839, 6.82293382],
+           [2.87137846, -9.68248579],
+           [7.87974764, -6.05485803],
+           [8.24018364, -6.09495602],
+           [7.39020262, 8.54004355]])
+ 
+linkage_X_centroid = array([[3., 4., 0.36265956, 2.],
+                            [1., 5., 1.77045373, 2.],
+                            [0., 2., 2.55760419, 2.],
+                            [6., 8., 6.43614494, 4.],
+                            [7., 9., 15.17363237, 6.]])
+
+linkage_X_median = array([[3., 4., 0.36265956, 2.],
+                          [1., 5., 1.77045373, 2.],
+                          [0., 2., 2.55760419, 2.],
+                          [6., 8., 6.43614494, 4.],
+                          [7., 9., 15.17363237, 6.]])
+
+linkage_X_ward = array([[3., 4., 0.36265956, 2.],
+                        [1., 5., 1.77045373, 2.],
+                        [0., 2., 2.55760419, 2.],
+                        [6., 8., 9.10208346, 4.],
+                        [7., 9., 24.7784379, 6.]])
+
+# the optimal leaf ordering of linkage_X_ward
+linkage_X_ward_olo = array([[4., 3., 0.36265956, 2.],
+                            [5., 1., 1.77045373, 2.],
+                            [2., 0., 2.55760419, 2.],
+                            [6., 8., 9.10208346, 4.],
+                            [7., 9., 24.7784379, 6.]])
+
+inconsistent_ytdist = {
+    1: array([[138., 0., 1., 0.],
+              [219., 0., 1., 0.],
+              [255., 0., 1., 0.],
+              [268., 0., 1., 0.],
+              [295., 0., 1., 0.]]),
+    2: array([[138., 0., 1., 0.],
+              [219., 0., 1., 0.],
+              [237., 25.45584412, 2., 0.70710678],
+              [261.5, 9.19238816, 2., 0.70710678],
+              [233.66666667, 83.9424406, 3., 0.7306594]]),
+    3: array([[138., 0., 1., 0.],
+              [219., 0., 1., 0.],
+              [237., 25.45584412, 2., 0.70710678],
+              [247.33333333, 25.38372182, 3., 0.81417007],
+              [239., 69.36377537, 4., 0.80733783]]),
+    4: array([[138., 0., 1., 0.],
+              [219., 0., 1., 0.],
+              [237., 25.45584412, 2., 0.70710678],
+              [247.33333333, 25.38372182, 3., 0.81417007],
+              [235., 60.73302232, 5., 0.98793042]])}
+
+fcluster_inconsistent = {
+    0.8: array([6, 2, 2, 4, 6, 2, 3, 7, 3, 5, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1,
+                1, 1, 1, 1, 1, 1, 1, 1, 1]),
+    1.0: array([6, 2, 2, 4, 6, 2, 3, 7, 3, 5, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1,
+                1, 1, 1, 1, 1, 1, 1, 1, 1]),
+    2.0: array([1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+                1, 1, 1, 1, 1, 1, 1, 1, 1])}
+
+fcluster_distance = {
+    0.6: array([4, 4, 4, 4, 4, 4, 4, 5, 4, 4, 6, 6, 6, 6, 6, 7, 6, 6, 6, 6, 3,
+                1, 1, 1, 2, 1, 1, 1, 1, 1]),
+    1.0: array([2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1,
+                1, 1, 1, 1, 1, 1, 1, 1, 1]),
+    2.0: array([1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+                1, 1, 1, 1, 1, 1, 1, 1, 1])}
+
+fcluster_maxclust = {
+    8.0: array([5, 5, 5, 5, 5, 5, 5, 6, 5, 5, 7, 7, 7, 7, 7, 8, 7, 7, 7, 7, 4,
+                1, 1, 1, 3, 1, 1, 1, 1, 2]),
+    4.0: array([3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2,
+                1, 1, 1, 1, 1, 1, 1, 1, 1]),
+    1.0: array([1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+                1, 1, 1, 1, 1, 1, 1, 1, 1])}

parrot/lib/python3.10/site-packages/scipy/cluster/tests/test_disjoint_set.py

@@ -0,0 +1,202 @@
+import pytest
+from pytest import raises as assert_raises
+import numpy as np
+from scipy.cluster.hierarchy import DisjointSet
+import string
+
+
+def generate_random_token():
+    k = len(string.ascii_letters)
+    tokens = list(np.arange(k, dtype=int))
+    tokens += list(np.arange(k, dtype=float))
+    tokens += list(string.ascii_letters)
+    tokens += [None for i in range(k)]
+    tokens = np.array(tokens, dtype=object)
+    rng = np.random.RandomState(seed=0)
+
+    while 1:
+        size = rng.randint(1, 3)
+        element = rng.choice(tokens, size)
+        if size == 1:
+            yield element[0]
+        else:
+            yield tuple(element)
+
+
+def get_elements(n):
+    # dict is deterministic without difficulty of comparing numpy ints
+    elements = {}
+    for element in generate_random_token():
+        if element not in elements:
+            elements[element] = len(elements)
+            if len(elements) >= n:
+                break
+    return list(elements.keys())
+
+
+def test_init():
+    n = 10
+    elements = get_elements(n)
+    dis = DisjointSet(elements)
+    assert dis.n_subsets == n
+    assert list(dis) == elements
+
+
+def test_len():
+    n = 10
+    elements = get_elements(n)
+    dis = DisjointSet(elements)
+    assert len(dis) == n
+
+    dis.add("dummy")
+    assert len(dis) == n + 1
+
+
+@pytest.mark.parametrize("n", [10, 100])
+def test_contains(n):
+    elements = get_elements(n)
+    dis = DisjointSet(elements)
+    for x in elements:
+        assert x in dis
+
+    assert "dummy" not in dis
+
+
+@pytest.mark.parametrize("n", [10, 100])
+def test_add(n):
+    elements = get_elements(n)
+    dis1 = DisjointSet(elements)
+
+    dis2 = DisjointSet()
+    for i, x in enumerate(elements):
+        dis2.add(x)
+        assert len(dis2) == i + 1
+
+        # test idempotency by adding element again
+        dis2.add(x)
+        assert len(dis2) == i + 1
+
+    assert list(dis1) == list(dis2)
+
+
+def test_element_not_present():
+    elements = get_elements(n=10)
+    dis = DisjointSet(elements)
+
+    with assert_raises(KeyError):
+        dis["dummy"]
+
+    with assert_raises(KeyError):
+        dis.merge(elements[0], "dummy")
+
+    with assert_raises(KeyError):
+        dis.connected(elements[0], "dummy")
+
+
+@pytest.mark.parametrize("direction", ["forwards", "backwards"])
+@pytest.mark.parametrize("n", [10, 100])
+def test_linear_union_sequence(n, direction):
+    elements = get_elements(n)
+    dis = DisjointSet(elements)
+    assert elements == list(dis)
+
+    indices = list(range(n - 1))
+    if direction == "backwards":
+        indices = indices[::-1]
+
+    for it, i in enumerate(indices):
+        assert not dis.connected(elements[i], elements[i + 1])
+        assert dis.merge(elements[i], elements[i + 1])
+        assert dis.connected(elements[i], elements[i + 1])
+        assert dis.n_subsets == n - 1 - it
+
+    roots = [dis[i] for i in elements]
+    if direction == "forwards":
+        assert all(elements[0] == r for r in roots)
+    else:
+        assert all(elements[-2] == r for r in roots)
+    assert not dis.merge(elements[0], elements[-1])
+
+
+@pytest.mark.parametrize("n", [10, 100])
+def test_self_unions(n):
+    elements = get_elements(n)
+    dis = DisjointSet(elements)
+
+    for x in elements:
+        assert dis.connected(x, x)
+        assert not dis.merge(x, x)
+        assert dis.connected(x, x)
+    assert dis.n_subsets == len(elements)
+
+    assert elements == list(dis)
+    roots = [dis[x] for x in elements]
+    assert elements == roots
+
+
+@pytest.mark.parametrize("order", ["ab", "ba"])
+@pytest.mark.parametrize("n", [10, 100])
+def test_equal_size_ordering(n, order):
+    elements = get_elements(n)
+    dis = DisjointSet(elements)
+
+    rng = np.random.RandomState(seed=0)
+    indices = np.arange(n)
+    rng.shuffle(indices)
+
+    for i in range(0, len(indices), 2):
+        a, b = elements[indices[i]], elements[indices[i + 1]]
+        if order == "ab":
+            assert dis.merge(a, b)
+        else:
+            assert dis.merge(b, a)
+
+        expected = elements[min(indices[i], indices[i + 1])]
+        assert dis[a] == expected
+        assert dis[b] == expected
+
+
+@pytest.mark.parametrize("kmax", [5, 10])
+def test_binary_tree(kmax):
+    n = 2**kmax
+    elements = get_elements(n)
+    dis = DisjointSet(elements)
+    rng = np.random.RandomState(seed=0)
+
+    for k in 2**np.arange(kmax):
+        for i in range(0, n, 2 * k):
+            r1, r2 = rng.randint(0, k, size=2)
+            a, b = elements[i + r1], elements[i + k + r2]
+            assert not dis.connected(a, b)
+            assert dis.merge(a, b)
+            assert dis.connected(a, b)
+
+        assert elements == list(dis)
+        roots = [dis[i] for i in elements]
+        expected_indices = np.arange(n) - np.arange(n) % (2 * k)
+        expected = [elements[i] for i in expected_indices]
+        assert roots == expected
+
+
+@pytest.mark.parametrize("n", [10, 100])
+def test_subsets(n):
+    elements = get_elements(n)
+    dis = DisjointSet(elements)
+
+    rng = np.random.RandomState(seed=0)
+    for i, j in rng.randint(0, n, (n, 2)):
+        x = elements[i]
+        y = elements[j]
+
+        expected = {element for element in dis if {dis[element]} == {dis[x]}}
+        assert dis.subset_size(x) == len(dis.subset(x))
+        assert expected == dis.subset(x)
+
+        expected = {dis[element]: set() for element in dis}
+        for element in dis:
+            expected[dis[element]].add(element)
+        expected = list(expected.values())
+        assert expected == dis.subsets()
+
+        dis.merge(x, y)
+        assert dis.subset(x) == dis.subset(y)

parrot/lib/python3.10/site-packages/scipy/cluster/tests/test_hierarchy.py

@@ -0,0 +1,1262 @@
+#
+# Author: Damian Eads
+# Date: April 17, 2008
+#
+# Copyright (C) 2008 Damian Eads
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above
+#    copyright notice, this list of conditions and the following
+#    disclaimer in the documentation and/or other materials provided
+#    with the distribution.
+#
+# 3. The name of the author may not be used to endorse or promote
+#    products derived from this software without specific prior
+#    written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
+# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+# GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+import numpy as np
+from numpy.testing import assert_allclose, assert_equal, assert_, assert_warns
+import pytest
+from pytest import raises as assert_raises
+
+import scipy.cluster.hierarchy
+from scipy.cluster.hierarchy import (
+    ClusterWarning, linkage, from_mlab_linkage, to_mlab_linkage,
+    num_obs_linkage, inconsistent, cophenet, fclusterdata, fcluster,
+    is_isomorphic, single, leaders,
+    correspond, is_monotonic, maxdists, maxinconsts, maxRstat,
+    is_valid_linkage, is_valid_im, to_tree, leaves_list, dendrogram,
+    set_link_color_palette, cut_tree, optimal_leaf_ordering,
+    _order_cluster_tree, _hierarchy, _LINKAGE_METHODS)
+from scipy.spatial.distance import pdist
+from scipy.cluster._hierarchy import Heap
+from scipy.conftest import array_api_compatible
+from scipy._lib._array_api import xp_assert_close, xp_assert_equal
+
+from . import hierarchy_test_data
+
+
+# Matplotlib is not a scipy dependency but is optionally used in dendrogram, so
+# check if it's available
+try:
+    import matplotlib
+    # and set the backend to be Agg (no gui)
+    matplotlib.use('Agg')
+    # before importing pyplot
+    import matplotlib.pyplot as plt
+    have_matplotlib = True
+except Exception:
+    have_matplotlib = False
+
+
+pytestmark = [array_api_compatible, pytest.mark.usefixtures("skip_xp_backends")]
+skip_xp_backends = pytest.mark.skip_xp_backends
+
+
+class TestLinkage:
+
+    @skip_xp_backends(cpu_only=True)
+    def test_linkage_non_finite_elements_in_distance_matrix(self, xp):
+        # Tests linkage(Y) where Y contains a non-finite element (e.g. NaN or Inf).
+        # Exception expected.
+        y = xp.asarray([xp.nan] + [0.0]*5)
+        assert_raises(ValueError, linkage, y)
+
+    @skip_xp_backends(cpu_only=True)
+    def test_linkage_empty_distance_matrix(self, xp):
+        # Tests linkage(Y) where Y is a 0x4 linkage matrix. Exception expected.
+        y = xp.zeros((0,))
+        assert_raises(ValueError, linkage, y)
+
+    @skip_xp_backends(cpu_only=True)
+    def test_linkage_tdist(self, xp):
+        for method in ['single', 'complete', 'average', 'weighted']:
+            self.check_linkage_tdist(method, xp)
+
+    def check_linkage_tdist(self, method, xp):
+        # Tests linkage(Y, method) on the tdist data set.
+        Z = linkage(xp.asarray(hierarchy_test_data.ytdist), method)
+        expectedZ = getattr(hierarchy_test_data, 'linkage_ytdist_' + method)
+        xp_assert_close(Z, xp.asarray(expectedZ), atol=1e-10)
+
+    @skip_xp_backends(cpu_only=True)
+    def test_linkage_X(self, xp):
+        for method in ['centroid', 'median', 'ward']:
+            self.check_linkage_q(method, xp)
+
+    def check_linkage_q(self, method, xp):
+        # Tests linkage(Y, method) on the Q data set.
+        Z = linkage(xp.asarray(hierarchy_test_data.X), method)
+        expectedZ = getattr(hierarchy_test_data, 'linkage_X_' + method)
+        xp_assert_close(Z, xp.asarray(expectedZ), atol=1e-06)
+
+        y = scipy.spatial.distance.pdist(hierarchy_test_data.X,
+                                         metric="euclidean")
+        Z = linkage(xp.asarray(y), method)
+        xp_assert_close(Z, xp.asarray(expectedZ), atol=1e-06)
+
+    @skip_xp_backends(cpu_only=True)
+    def test_compare_with_trivial(self, xp):
+        rng = np.random.RandomState(0)
+        n = 20
+        X = rng.rand(n, 2)
+        d = pdist(X)
+
+        for method, code in _LINKAGE_METHODS.items():
+            Z_trivial = _hierarchy.linkage(d, n, code)
+            Z = linkage(xp.asarray(d), method)
+            xp_assert_close(Z, xp.asarray(Z_trivial), rtol=1e-14, atol=1e-15)
+
+    @skip_xp_backends(cpu_only=True)
+    def test_optimal_leaf_ordering(self, xp):
+        Z = linkage(xp.asarray(hierarchy_test_data.ytdist), optimal_ordering=True)
+        expectedZ = getattr(hierarchy_test_data, 'linkage_ytdist_single_olo')
+        xp_assert_close(Z, xp.asarray(expectedZ), atol=1e-10)
+
+
+@skip_xp_backends(cpu_only=True)
+class TestLinkageTies:
+
+    _expectations = {
+        'single': np.array([[0, 1, 1.41421356, 2],
+                            [2, 3, 1.41421356, 3]]),
+        'complete': np.array([[0, 1, 1.41421356, 2],
+                              [2, 3, 2.82842712, 3]]),
+        'average': np.array([[0, 1, 1.41421356, 2],
+                             [2, 3, 2.12132034, 3]]),
+        'weighted': np.array([[0, 1, 1.41421356, 2],
+                              [2, 3, 2.12132034, 3]]),
+        'centroid': np.array([[0, 1, 1.41421356, 2],
+                              [2, 3, 2.12132034, 3]]),
+        'median': np.array([[0, 1, 1.41421356, 2],
+                            [2, 3, 2.12132034, 3]]),
+        'ward': np.array([[0, 1, 1.41421356, 2],
+                          [2, 3, 2.44948974, 3]]),
+    }
+
+    def test_linkage_ties(self, xp):
+        for method in ['single', 'complete', 'average', 'weighted',
+                       'centroid', 'median', 'ward']:
+            self.check_linkage_ties(method, xp)
+
+    def check_linkage_ties(self, method, xp):
+        X = xp.asarray([[-1, -1], [0, 0], [1, 1]])
+        Z = linkage(X, method=method)
+        expectedZ = self._expectations[method]
+        xp_assert_close(Z, xp.asarray(expectedZ), atol=1e-06)
+
+
+@skip_xp_backends(cpu_only=True)
+class TestInconsistent:
+
+    def test_inconsistent_tdist(self, xp):
+        for depth in hierarchy_test_data.inconsistent_ytdist:
+            self.check_inconsistent_tdist(depth, xp)
+
+    def check_inconsistent_tdist(self, depth, xp):
+        Z = xp.asarray(hierarchy_test_data.linkage_ytdist_single)
+        xp_assert_close(inconsistent(Z, depth),
+                        xp.asarray(hierarchy_test_data.inconsistent_ytdist[depth]))
+
+
+@skip_xp_backends(cpu_only=True)
+class TestCopheneticDistance:
+
+    def test_linkage_cophenet_tdist_Z(self, xp):
+        # Tests cophenet(Z) on tdist data set.
+        expectedM = xp.asarray([268, 295, 255, 255, 295, 295, 268, 268, 295, 295,
+                                295, 138, 219, 295, 295])
+        Z = xp.asarray(hierarchy_test_data.linkage_ytdist_single)
+        M = cophenet(Z)
+        xp_assert_close(M, xp.asarray(expectedM, dtype=xp.float64), atol=1e-10)
+
+    def test_linkage_cophenet_tdist_Z_Y(self, xp):
+        # Tests cophenet(Z, Y) on tdist data set.
+        Z = xp.asarray(hierarchy_test_data.linkage_ytdist_single)
+        (c, M) = cophenet(Z, xp.asarray(hierarchy_test_data.ytdist))
+        expectedM = xp.asarray([268, 295, 255, 255, 295, 295, 268, 268, 295, 295,
+                                295, 138, 219, 295, 295], dtype=xp.float64)
+        expectedc = xp.asarray(0.639931296433393415057366837573, dtype=xp.float64)[()]
+        xp_assert_close(c, expectedc, atol=1e-10)
+        xp_assert_close(M, expectedM, atol=1e-10)
+
+
+class TestMLabLinkageConversion:
+
+    def test_mlab_linkage_conversion_empty(self, xp):
+        # Tests from/to_mlab_linkage on empty linkage array.
+        X = xp.asarray([], dtype=xp.float64)
+        xp_assert_equal(from_mlab_linkage(X), X)
+        xp_assert_equal(to_mlab_linkage(X), X)
+
+    @skip_xp_backends(cpu_only=True)
+    def test_mlab_linkage_conversion_single_row(self, xp):
+        # Tests from/to_mlab_linkage on linkage array with single row.
+        Z = xp.asarray([[0., 1., 3., 2.]])
+        Zm = xp.asarray([[1, 2, 3]])
+        xp_assert_close(from_mlab_linkage(Zm), xp.asarray(Z, dtype=xp.float64),
+                        rtol=1e-15)
+        xp_assert_close(to_mlab_linkage(Z), xp.asarray(Zm, dtype=xp.float64),
+                        rtol=1e-15)
+
+    @skip_xp_backends(cpu_only=True)
+    def test_mlab_linkage_conversion_multiple_rows(self, xp):
+        # Tests from/to_mlab_linkage on linkage array with multiple rows.
+        Zm = xp.asarray([[3, 6, 138], [4, 5, 219],
+                         [1, 8, 255], [2, 9, 268], [7, 10, 295]])
+        Z = xp.asarray([[2., 5., 138., 2.],
+                        [3., 4., 219., 2.],
+                        [0., 7., 255., 3.],
+                        [1., 8., 268., 4.],
+                        [6., 9., 295., 6.]],
+                       dtype=xp.float64)
+        xp_assert_close(from_mlab_linkage(Zm), Z, rtol=1e-15)
+        xp_assert_close(to_mlab_linkage(Z), xp.asarray(Zm, dtype=xp.float64),
+                        rtol=1e-15)
+
+
+@skip_xp_backends(cpu_only=True)
+class TestFcluster:
+
+    def test_fclusterdata(self, xp):
+        for t in hierarchy_test_data.fcluster_inconsistent:
+            self.check_fclusterdata(t, 'inconsistent', xp)
+        for t in hierarchy_test_data.fcluster_distance:
+            self.check_fclusterdata(t, 'distance', xp)
+        for t in hierarchy_test_data.fcluster_maxclust:
+            self.check_fclusterdata(t, 'maxclust', xp)
+
+    def check_fclusterdata(self, t, criterion, xp):
+        # Tests fclusterdata(X, criterion=criterion, t=t) on a random 3-cluster data set
+        expectedT = xp.asarray(getattr(hierarchy_test_data, 'fcluster_' + criterion)[t])
+        X = xp.asarray(hierarchy_test_data.Q_X)
+        T = fclusterdata(X, criterion=criterion, t=t)
+        assert_(is_isomorphic(T, expectedT))
+
+    def test_fcluster(self, xp):
+        for t in hierarchy_test_data.fcluster_inconsistent:
+            self.check_fcluster(t, 'inconsistent', xp)
+        for t in hierarchy_test_data.fcluster_distance:
+            self.check_fcluster(t, 'distance', xp)
+        for t in hierarchy_test_data.fcluster_maxclust:
+            self.check_fcluster(t, 'maxclust', xp)
+
+    def check_fcluster(self, t, criterion, xp):
+        # Tests fcluster(Z, criterion=criterion, t=t) on a random 3-cluster data set.
+        expectedT = xp.asarray(getattr(hierarchy_test_data, 'fcluster_' + criterion)[t])
+        Z = single(xp.asarray(hierarchy_test_data.Q_X))
+        T = fcluster(Z, criterion=criterion, t=t)
+        assert_(is_isomorphic(T, expectedT))
+
+    def test_fcluster_monocrit(self, xp):
+        for t in hierarchy_test_data.fcluster_distance:
+            self.check_fcluster_monocrit(t, xp)
+        for t in hierarchy_test_data.fcluster_maxclust:
+            self.check_fcluster_maxclust_monocrit(t, xp)
+
+    def check_fcluster_monocrit(self, t, xp):
+        expectedT = xp.asarray(hierarchy_test_data.fcluster_distance[t])
+        Z = single(xp.asarray(hierarchy_test_data.Q_X))
+        T = fcluster(Z, t, criterion='monocrit', monocrit=maxdists(Z))
+        assert_(is_isomorphic(T, expectedT))
+
+    def check_fcluster_maxclust_monocrit(self, t, xp):
+        expectedT = xp.asarray(hierarchy_test_data.fcluster_maxclust[t])
+        Z = single(xp.asarray(hierarchy_test_data.Q_X))
+        T = fcluster(Z, t, criterion='maxclust_monocrit', monocrit=maxdists(Z))
+        assert_(is_isomorphic(T, expectedT))
+
+
+@skip_xp_backends(cpu_only=True)
+class TestLeaders:
+
+    def test_leaders_single(self, xp):
+        # Tests leaders using a flat clustering generated by single linkage.
+        X = hierarchy_test_data.Q_X
+        Y = pdist(X)
+        Y = xp.asarray(Y)
+        Z = linkage(Y)
+        T = fcluster(Z, criterion='maxclust', t=3)
+        Lright = (xp.asarray([53, 55, 56]), xp.asarray([2, 3, 1]))
+        T = xp.asarray(T, dtype=xp.int32)
+        L = leaders(Z, T)
+        assert_allclose(np.concatenate(L), np.concatenate(Lright), rtol=1e-15)
+
+
+@skip_xp_backends(np_only=True,
+                   reasons=['`is_isomorphic` only supports NumPy backend'])
+class TestIsIsomorphic:
+
+    @skip_xp_backends(np_only=True,
+                       reasons=['array-likes only supported for NumPy backend'])
+    def test_array_like(self, xp):
+        assert is_isomorphic([1, 1, 1], [2, 2, 2])
+        assert is_isomorphic([], [])
+
+    def test_is_isomorphic_1(self, xp):
+        # Tests is_isomorphic on test case #1 (one flat cluster, different labellings)
+        a = xp.asarray([1, 1, 1])
+        b = xp.asarray([2, 2, 2])
+        assert is_isomorphic(a, b)
+        assert is_isomorphic(b, a)
+
+    def test_is_isomorphic_2(self, xp):
+        # Tests is_isomorphic on test case #2 (two flat clusters, different labelings)
+        a = xp.asarray([1, 7, 1])
+        b = xp.asarray([2, 3, 2])
+        assert is_isomorphic(a, b)
+        assert is_isomorphic(b, a)
+
+    def test_is_isomorphic_3(self, xp):
+        # Tests is_isomorphic on test case #3 (no flat clusters)
+        a = xp.asarray([])
+        b = xp.asarray([])
+        assert is_isomorphic(a, b)
+
+    def test_is_isomorphic_4A(self, xp):
+        # Tests is_isomorphic on test case #4A
+        # (3 flat clusters, different labelings, isomorphic)
+        a = xp.asarray([1, 2, 3])
+        b = xp.asarray([1, 3, 2])
+        assert is_isomorphic(a, b)
+        assert is_isomorphic(b, a)
+
+    def test_is_isomorphic_4B(self, xp):
+        # Tests is_isomorphic on test case #4B
+        # (3 flat clusters, different labelings, nonisomorphic)
+        a = xp.asarray([1, 2, 3, 3])
+        b = xp.asarray([1, 3, 2, 3])
+        assert is_isomorphic(a, b) is False
+        assert is_isomorphic(b, a) is False
+
+    def test_is_isomorphic_4C(self, xp):
+        # Tests is_isomorphic on test case #4C
+        # (3 flat clusters, different labelings, isomorphic)
+        a = xp.asarray([7, 2, 3])
+        b = xp.asarray([6, 3, 2])
+        assert is_isomorphic(a, b)
+        assert is_isomorphic(b, a)
+
+    def test_is_isomorphic_5(self, xp):
+        # Tests is_isomorphic on test case #5 (1000 observations, 2/3/5 random
+        # clusters, random permutation of the labeling).
+        for nc in [2, 3, 5]:
+            self.help_is_isomorphic_randperm(1000, nc, xp=xp)
+
+    def test_is_isomorphic_6(self, xp):
+        # Tests is_isomorphic on test case #5A (1000 observations, 2/3/5 random
+        # clusters, random permutation of the labeling, slightly
+        # nonisomorphic.)
+        for nc in [2, 3, 5]:
+            self.help_is_isomorphic_randperm(1000, nc, True, 5, xp=xp)
+
+    def test_is_isomorphic_7(self, xp):
+        # Regression test for gh-6271
+        a = xp.asarray([1, 2, 3])
+        b = xp.asarray([1, 1, 1])
+        assert not is_isomorphic(a, b)
+
+    def help_is_isomorphic_randperm(self, nobs, nclusters, noniso=False, nerrors=0,
+                                    *, xp):
+        for k in range(3):
+            a = (np.random.rand(nobs) * nclusters).astype(int)
+            b = np.zeros(a.size, dtype=int)
+            P = np.random.permutation(nclusters)
+            for i in range(0, a.shape[0]):
+                b[i] = P[a[i]]
+            if noniso:
+                Q = np.random.permutation(nobs)
+                b[Q[0:nerrors]] += 1
+                b[Q[0:nerrors]] %= nclusters
+            a = xp.asarray(a)
+            b = xp.asarray(b)
+            assert is_isomorphic(a, b) == (not noniso)
+            assert is_isomorphic(b, a) == (not noniso)
+
+
+@skip_xp_backends(cpu_only=True)
+class TestIsValidLinkage:
+
+    def test_is_valid_linkage_various_size(self, xp):
+        for nrow, ncol, valid in [(2, 5, False), (2, 3, False),
+                                  (1, 4, True), (2, 4, True)]:
+            self.check_is_valid_linkage_various_size(nrow, ncol, valid, xp)
+
+    def check_is_valid_linkage_various_size(self, nrow, ncol, valid, xp):
+        # Tests is_valid_linkage(Z) with linkage matrices of various sizes
+        Z = xp.asarray([[0, 1, 3.0, 2, 5],
+                        [3, 2, 4.0, 3, 3]], dtype=xp.float64)
+        Z = Z[:nrow, :ncol]
+        assert_(is_valid_linkage(Z) == valid)
+        if not valid:
+            assert_raises(ValueError, is_valid_linkage, Z, throw=True)
+
+    def test_is_valid_linkage_int_type(self, xp):
+        # Tests is_valid_linkage(Z) with integer type.
+        Z = xp.asarray([[0, 1, 3.0, 2],
+                        [3, 2, 4.0, 3]], dtype=xp.int64)
+        assert_(is_valid_linkage(Z) is False)
+        assert_raises(TypeError, is_valid_linkage, Z, throw=True)
+
+    def test_is_valid_linkage_empty(self, xp):
+        # Tests is_valid_linkage(Z) with empty linkage.
+        Z = xp.zeros((0, 4), dtype=xp.float64)
+        assert_(is_valid_linkage(Z) is False)
+        assert_raises(ValueError, is_valid_linkage, Z, throw=True)
+
+    def test_is_valid_linkage_4_and_up(self, xp):
+        # Tests is_valid_linkage(Z) on linkage on observation sets between
+        # sizes 4 and 15 (step size 3).
+        for i in range(4, 15, 3):
+            y = np.random.rand(i*(i-1)//2)
+            y = xp.asarray(y)
+            Z = linkage(y)
+            assert_(is_valid_linkage(Z) is True)
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_is_valid_linkage_4_and_up_neg_index_left(self, xp):
+        # Tests is_valid_linkage(Z) on linkage on observation sets between
+        # sizes 4 and 15 (step size 3) with negative indices (left).
+        for i in range(4, 15, 3):
+            y = np.random.rand(i*(i-1)//2)
+            y = xp.asarray(y)
+            Z = linkage(y)
+            Z[i//2,0] = -2
+            assert_(is_valid_linkage(Z) is False)
+            assert_raises(ValueError, is_valid_linkage, Z, throw=True)
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_is_valid_linkage_4_and_up_neg_index_right(self, xp):
+        # Tests is_valid_linkage(Z) on linkage on observation sets between
+        # sizes 4 and 15 (step size 3) with negative indices (right).
+        for i in range(4, 15, 3):
+            y = np.random.rand(i*(i-1)//2)
+            y = xp.asarray(y)
+            Z = linkage(y)
+            Z[i//2,1] = -2
+            assert_(is_valid_linkage(Z) is False)
+            assert_raises(ValueError, is_valid_linkage, Z, throw=True)
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_is_valid_linkage_4_and_up_neg_dist(self, xp):
+        # Tests is_valid_linkage(Z) on linkage on observation sets between
+        # sizes 4 and 15 (step size 3) with negative distances.
+        for i in range(4, 15, 3):
+            y = np.random.rand(i*(i-1)//2)
+            y = xp.asarray(y)
+            Z = linkage(y)
+            Z[i//2,2] = -0.5
+            assert_(is_valid_linkage(Z) is False)
+            assert_raises(ValueError, is_valid_linkage, Z, throw=True)
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_is_valid_linkage_4_and_up_neg_counts(self, xp):
+        # Tests is_valid_linkage(Z) on linkage on observation sets between
+        # sizes 4 and 15 (step size 3) with negative counts.
+        for i in range(4, 15, 3):
+            y = np.random.rand(i*(i-1)//2)
+            y = xp.asarray(y)
+            Z = linkage(y)
+            Z[i//2,3] = -2
+            assert_(is_valid_linkage(Z) is False)
+            assert_raises(ValueError, is_valid_linkage, Z, throw=True)
+
+
+@skip_xp_backends(cpu_only=True)
+class TestIsValidInconsistent:
+
+    def test_is_valid_im_int_type(self, xp):
+        # Tests is_valid_im(R) with integer type.
+        R = xp.asarray([[0, 1, 3.0, 2],
+                        [3, 2, 4.0, 3]], dtype=xp.int64)
+        assert_(is_valid_im(R) is False)
+        assert_raises(TypeError, is_valid_im, R, throw=True)
+
+    def test_is_valid_im_various_size(self, xp):
+        for nrow, ncol, valid in [(2, 5, False), (2, 3, False),
+                                  (1, 4, True), (2, 4, True)]:
+            self.check_is_valid_im_various_size(nrow, ncol, valid, xp)
+
+    def check_is_valid_im_various_size(self, nrow, ncol, valid, xp):
+        # Tests is_valid_im(R) with linkage matrices of various sizes
+        R = xp.asarray([[0, 1, 3.0, 2, 5],
+                        [3, 2, 4.0, 3, 3]], dtype=xp.float64)
+        R = R[:nrow, :ncol]
+        assert_(is_valid_im(R) == valid)
+        if not valid:
+            assert_raises(ValueError, is_valid_im, R, throw=True)
+
+    def test_is_valid_im_empty(self, xp):
+        # Tests is_valid_im(R) with empty inconsistency matrix.
+        R = xp.zeros((0, 4), dtype=xp.float64)
+        assert_(is_valid_im(R) is False)
+        assert_raises(ValueError, is_valid_im, R, throw=True)
+
+    def test_is_valid_im_4_and_up(self, xp):
+        # Tests is_valid_im(R) on im on observation sets between sizes 4 and 15
+        # (step size 3).
+        for i in range(4, 15, 3):
+            y = np.random.rand(i*(i-1)//2)
+            y = xp.asarray(y)
+            Z = linkage(y)
+            R = inconsistent(Z)
+            assert_(is_valid_im(R) is True)
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_is_valid_im_4_and_up_neg_index_left(self, xp):
+        # Tests is_valid_im(R) on im on observation sets between sizes 4 and 15
+        # (step size 3) with negative link height means.
+        for i in range(4, 15, 3):
+            y = np.random.rand(i*(i-1)//2)
+            y = xp.asarray(y)
+            Z = linkage(y)
+            R = inconsistent(Z)
+            R[i//2,0] = -2.0
+            assert_(is_valid_im(R) is False)
+            assert_raises(ValueError, is_valid_im, R, throw=True)
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_is_valid_im_4_and_up_neg_index_right(self, xp):
+        # Tests is_valid_im(R) on im on observation sets between sizes 4 and 15
+        # (step size 3) with negative link height standard deviations.
+        for i in range(4, 15, 3):
+            y = np.random.rand(i*(i-1)//2)
+            y = xp.asarray(y)
+            Z = linkage(y)
+            R = inconsistent(Z)
+            R[i//2,1] = -2.0
+            assert_(is_valid_im(R) is False)
+            assert_raises(ValueError, is_valid_im, R, throw=True)
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_is_valid_im_4_and_up_neg_dist(self, xp):
+        # Tests is_valid_im(R) on im on observation sets between sizes 4 and 15
+        # (step size 3) with negative link counts.
+        for i in range(4, 15, 3):
+            y = np.random.rand(i*(i-1)//2)
+            y = xp.asarray(y)
+            Z = linkage(y)
+            R = inconsistent(Z)
+            R[i//2,2] = -0.5
+            assert_(is_valid_im(R) is False)
+            assert_raises(ValueError, is_valid_im, R, throw=True)
+
+
+class TestNumObsLinkage:
+
+    @skip_xp_backends(cpu_only=True)
+    def test_num_obs_linkage_empty(self, xp):
+        # Tests num_obs_linkage(Z) with empty linkage.
+        Z = xp.zeros((0, 4), dtype=xp.float64)
+        assert_raises(ValueError, num_obs_linkage, Z)
+
+    def test_num_obs_linkage_1x4(self, xp):
+        # Tests num_obs_linkage(Z) on linkage over 2 observations.
+        Z = xp.asarray([[0, 1, 3.0, 2]], dtype=xp.float64)
+        assert_equal(num_obs_linkage(Z), 2)
+
+    def test_num_obs_linkage_2x4(self, xp):
+        # Tests num_obs_linkage(Z) on linkage over 3 observations.
+        Z = xp.asarray([[0, 1, 3.0, 2],
+                        [3, 2, 4.0, 3]], dtype=xp.float64)
+        assert_equal(num_obs_linkage(Z), 3)
+
+    @skip_xp_backends(cpu_only=True)
+    def test_num_obs_linkage_4_and_up(self, xp):
+        # Tests num_obs_linkage(Z) on linkage on observation sets between sizes
+        # 4 and 15 (step size 3).
+        for i in range(4, 15, 3):
+            y = np.random.rand(i*(i-1)//2)
+            y = xp.asarray(y)
+            Z = linkage(y)
+            assert_equal(num_obs_linkage(Z), i)
+
+
+@skip_xp_backends(cpu_only=True)
+class TestLeavesList:
+
+    def test_leaves_list_1x4(self, xp):
+        # Tests leaves_list(Z) on a 1x4 linkage.
+        Z = xp.asarray([[0, 1, 3.0, 2]], dtype=xp.float64)
+        to_tree(Z)
+        assert_allclose(leaves_list(Z), [0, 1], rtol=1e-15)
+
+    def test_leaves_list_2x4(self, xp):
+        # Tests leaves_list(Z) on a 2x4 linkage.
+        Z = xp.asarray([[0, 1, 3.0, 2],
+                        [3, 2, 4.0, 3]], dtype=xp.float64)
+        to_tree(Z)
+        assert_allclose(leaves_list(Z), [0, 1, 2], rtol=1e-15)
+
+    def test_leaves_list_Q(self, xp):
+        for method in ['single', 'complete', 'average', 'weighted', 'centroid',
+                       'median', 'ward']:
+            self.check_leaves_list_Q(method, xp)
+
+    def check_leaves_list_Q(self, method, xp):
+        # Tests leaves_list(Z) on the Q data set
+        X = xp.asarray(hierarchy_test_data.Q_X)
+        Z = linkage(X, method)
+        node = to_tree(Z)
+        assert_allclose(node.pre_order(), leaves_list(Z), rtol=1e-15)
+
+    def test_Q_subtree_pre_order(self, xp):
+        # Tests that pre_order() works when called on sub-trees.
+        X = xp.asarray(hierarchy_test_data.Q_X)
+        Z = linkage(X, 'single')
+        node = to_tree(Z)
+        assert_allclose(node.pre_order(), (node.get_left().pre_order()
+                                           + node.get_right().pre_order()),
+                        rtol=1e-15)
+
+
+@skip_xp_backends(cpu_only=True)
+class TestCorrespond:
+
+    def test_correspond_empty(self, xp):
+        # Tests correspond(Z, y) with empty linkage and condensed distance matrix.
+        y = xp.zeros((0,), dtype=xp.float64)
+        Z = xp.zeros((0,4), dtype=xp.float64)
+        assert_raises(ValueError, correspond, Z, y)
+
+    def test_correspond_2_and_up(self, xp):
+        # Tests correspond(Z, y) on linkage and CDMs over observation sets of
+        # different sizes.
+        for i in range(2, 4):
+            y = np.random.rand(i*(i-1)//2)
+            y = xp.asarray(y)
+            Z = linkage(y)
+            assert_(correspond(Z, y))
+        for i in range(4, 15, 3):
+            y = np.random.rand(i*(i-1)//2)
+            y = xp.asarray(y)
+            Z = linkage(y)
+            assert_(correspond(Z, y))
+
+    def test_correspond_4_and_up(self, xp):
+        # Tests correspond(Z, y) on linkage and CDMs over observation sets of
+        # different sizes. Correspondence should be false.
+        for (i, j) in (list(zip(list(range(2, 4)), list(range(3, 5)))) +
+                       list(zip(list(range(3, 5)), list(range(2, 4))))):
+            y = np.random.rand(i*(i-1)//2)
+            y2 = np.random.rand(j*(j-1)//2)
+            y = xp.asarray(y)
+            y2 = xp.asarray(y2)
+            Z = linkage(y)
+            Z2 = linkage(y2)
+            assert not correspond(Z, y2)
+            assert not correspond(Z2, y)
+
+    def test_correspond_4_and_up_2(self, xp):
+        # Tests correspond(Z, y) on linkage and CDMs over observation sets of
+        # different sizes. Correspondence should be false.
+        for (i, j) in (list(zip(list(range(2, 7)), list(range(16, 21)))) +
+                       list(zip(list(range(2, 7)), list(range(16, 21))))):
+            y = np.random.rand(i*(i-1)//2)
+            y2 = np.random.rand(j*(j-1)//2)
+            y = xp.asarray(y)
+            y2 = xp.asarray(y2)
+            Z = linkage(y)
+            Z2 = linkage(y2)
+            assert not correspond(Z, y2)
+            assert not correspond(Z2, y)
+
+    def test_num_obs_linkage_multi_matrix(self, xp):
+        # Tests num_obs_linkage with observation matrices of multiple sizes.
+        for n in range(2, 10):
+            X = np.random.rand(n, 4)
+            Y = pdist(X)
+            Y = xp.asarray(Y)
+            Z = linkage(Y)
+            assert_equal(num_obs_linkage(Z), n)
+
+
+@skip_xp_backends(cpu_only=True)
+class TestIsMonotonic:
+
+    def test_is_monotonic_empty(self, xp):
+        # Tests is_monotonic(Z) on an empty linkage.
+        Z = xp.zeros((0, 4), dtype=xp.float64)
+        assert_raises(ValueError, is_monotonic, Z)
+
+    def test_is_monotonic_1x4(self, xp):
+        # Tests is_monotonic(Z) on 1x4 linkage. Expecting True.
+        Z = xp.asarray([[0, 1, 0.3, 2]], dtype=xp.float64)
+        assert is_monotonic(Z)
+
+    def test_is_monotonic_2x4_T(self, xp):
+        # Tests is_monotonic(Z) on 2x4 linkage. Expecting True.
+        Z = xp.asarray([[0, 1, 0.3, 2],
+                        [2, 3, 0.4, 3]], dtype=xp.float64)
+        assert is_monotonic(Z)
+
+    def test_is_monotonic_2x4_F(self, xp):
+        # Tests is_monotonic(Z) on 2x4 linkage. Expecting False.
+        Z = xp.asarray([[0, 1, 0.4, 2],
+                        [2, 3, 0.3, 3]], dtype=xp.float64)
+        assert not is_monotonic(Z)
+
+    def test_is_monotonic_3x4_T(self, xp):
+        # Tests is_monotonic(Z) on 3x4 linkage. Expecting True.
+        Z = xp.asarray([[0, 1, 0.3, 2],
+                        [2, 3, 0.4, 2],
+                        [4, 5, 0.6, 4]], dtype=xp.float64)
+        assert is_monotonic(Z)
+
+    def test_is_monotonic_3x4_F1(self, xp):
+        # Tests is_monotonic(Z) on 3x4 linkage (case 1). Expecting False.
+        Z = xp.asarray([[0, 1, 0.3, 2],
+                        [2, 3, 0.2, 2],
+                        [4, 5, 0.6, 4]], dtype=xp.float64)
+        assert not is_monotonic(Z)
+
+    def test_is_monotonic_3x4_F2(self, xp):
+        # Tests is_monotonic(Z) on 3x4 linkage (case 2). Expecting False.
+        Z = xp.asarray([[0, 1, 0.8, 2],
+                        [2, 3, 0.4, 2],
+                        [4, 5, 0.6, 4]], dtype=xp.float64)
+        assert not is_monotonic(Z)
+
+    def test_is_monotonic_3x4_F3(self, xp):
+        # Tests is_monotonic(Z) on 3x4 linkage (case 3). Expecting False
+        Z = xp.asarray([[0, 1, 0.3, 2],
+                        [2, 3, 0.4, 2],
+                        [4, 5, 0.2, 4]], dtype=xp.float64)
+        assert not is_monotonic(Z)
+
+    def test_is_monotonic_tdist_linkage1(self, xp):
+        # Tests is_monotonic(Z) on clustering generated by single linkage on
+        # tdist data set. Expecting True.
+        Z = linkage(xp.asarray(hierarchy_test_data.ytdist), 'single')
+        assert is_monotonic(Z)
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_is_monotonic_tdist_linkage2(self, xp):
+        # Tests is_monotonic(Z) on clustering generated by single linkage on
+        # tdist data set. Perturbing. Expecting False.
+        Z = linkage(xp.asarray(hierarchy_test_data.ytdist), 'single')
+        Z[2,2] = 0.0
+        assert not is_monotonic(Z)
+
+    def test_is_monotonic_Q_linkage(self, xp):
+        # Tests is_monotonic(Z) on clustering generated by single linkage on
+        # Q data set. Expecting True.
+        X = xp.asarray(hierarchy_test_data.Q_X)
+        Z = linkage(X, 'single')
+        assert is_monotonic(Z)
+
+
+@skip_xp_backends(cpu_only=True)
+class TestMaxDists:
+
+    def test_maxdists_empty_linkage(self, xp):
+        # Tests maxdists(Z) on empty linkage. Expecting exception.
+        Z = xp.zeros((0, 4), dtype=xp.float64)
+        assert_raises(ValueError, maxdists, Z)
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_maxdists_one_cluster_linkage(self, xp):
+        # Tests maxdists(Z) on linkage with one cluster.
+        Z = xp.asarray([[0, 1, 0.3, 4]], dtype=xp.float64)
+        MD = maxdists(Z)
+        expectedMD = calculate_maximum_distances(Z, xp)
+        xp_assert_close(MD, expectedMD, atol=1e-15)
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_maxdists_Q_linkage(self, xp):
+        for method in ['single', 'complete', 'ward', 'centroid', 'median']:
+            self.check_maxdists_Q_linkage(method, xp)
+
+    def check_maxdists_Q_linkage(self, method, xp):
+        # Tests maxdists(Z) on the Q data set
+        X = xp.asarray(hierarchy_test_data.Q_X)
+        Z = linkage(X, method)
+        MD = maxdists(Z)
+        expectedMD = calculate_maximum_distances(Z, xp)
+        xp_assert_close(MD, expectedMD, atol=1e-15)
+
+
+class TestMaxInconsts:
+
+    @skip_xp_backends(cpu_only=True)
+    def test_maxinconsts_empty_linkage(self, xp):
+        # Tests maxinconsts(Z, R) on empty linkage. Expecting exception.
+        Z = xp.zeros((0, 4), dtype=xp.float64)
+        R = xp.zeros((0, 4), dtype=xp.float64)
+        assert_raises(ValueError, maxinconsts, Z, R)
+
+    def test_maxinconsts_difrow_linkage(self, xp):
+        # Tests maxinconsts(Z, R) on linkage and inconsistency matrices with
+        # different numbers of clusters. Expecting exception.
+        Z = xp.asarray([[0, 1, 0.3, 4]], dtype=xp.float64)
+        R = np.random.rand(2, 4)
+        R = xp.asarray(R)
+        assert_raises(ValueError, maxinconsts, Z, R)
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_maxinconsts_one_cluster_linkage(self, xp):
+        # Tests maxinconsts(Z, R) on linkage with one cluster.
+        Z = xp.asarray([[0, 1, 0.3, 4]], dtype=xp.float64)
+        R = xp.asarray([[0, 0, 0, 0.3]], dtype=xp.float64)
+        MD = maxinconsts(Z, R)
+        expectedMD = calculate_maximum_inconsistencies(Z, R, xp=xp)
+        xp_assert_close(MD, expectedMD, atol=1e-15)
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_maxinconsts_Q_linkage(self, xp):
+        for method in ['single', 'complete', 'ward', 'centroid', 'median']:
+            self.check_maxinconsts_Q_linkage(method, xp)
+
+    def check_maxinconsts_Q_linkage(self, method, xp):
+        # Tests maxinconsts(Z, R) on the Q data set
+        X = xp.asarray(hierarchy_test_data.Q_X)
+        Z = linkage(X, method)
+        R = inconsistent(Z)
+        MD = maxinconsts(Z, R)
+        expectedMD = calculate_maximum_inconsistencies(Z, R, xp=xp)
+        xp_assert_close(MD, expectedMD, atol=1e-15)
+
+
+class TestMaxRStat:
+
+    def test_maxRstat_invalid_index(self, xp):
+        for i in [3.3, -1, 4]:
+            self.check_maxRstat_invalid_index(i, xp)
+
+    def check_maxRstat_invalid_index(self, i, xp):
+        # Tests maxRstat(Z, R, i). Expecting exception.
+        Z = xp.asarray([[0, 1, 0.3, 4]], dtype=xp.float64)
+        R = xp.asarray([[0, 0, 0, 0.3]], dtype=xp.float64)
+        if isinstance(i, int):
+            assert_raises(ValueError, maxRstat, Z, R, i)
+        else:
+            assert_raises(TypeError, maxRstat, Z, R, i)
+
+    @skip_xp_backends(cpu_only=True)
+    def test_maxRstat_empty_linkage(self, xp):
+        for i in range(4):
+            self.check_maxRstat_empty_linkage(i, xp)
+
+    def check_maxRstat_empty_linkage(self, i, xp):
+        # Tests maxRstat(Z, R, i) on empty linkage. Expecting exception.
+        Z = xp.zeros((0, 4), dtype=xp.float64)
+        R = xp.zeros((0, 4), dtype=xp.float64)
+        assert_raises(ValueError, maxRstat, Z, R, i)
+
+    def test_maxRstat_difrow_linkage(self, xp):
+        for i in range(4):
+            self.check_maxRstat_difrow_linkage(i, xp)
+
+    def check_maxRstat_difrow_linkage(self, i, xp):
+        # Tests maxRstat(Z, R, i) on linkage and inconsistency matrices with
+        # different numbers of clusters. Expecting exception.
+        Z = xp.asarray([[0, 1, 0.3, 4]], dtype=xp.float64)
+        R = np.random.rand(2, 4)
+        R = xp.asarray(R)
+        assert_raises(ValueError, maxRstat, Z, R, i)
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_maxRstat_one_cluster_linkage(self, xp):
+        for i in range(4):
+            self.check_maxRstat_one_cluster_linkage(i, xp)
+
+    def check_maxRstat_one_cluster_linkage(self, i, xp):
+        # Tests maxRstat(Z, R, i) on linkage with one cluster.
+        Z = xp.asarray([[0, 1, 0.3, 4]], dtype=xp.float64)
+        R = xp.asarray([[0, 0, 0, 0.3]], dtype=xp.float64)
+        MD = maxRstat(Z, R, 1)
+        expectedMD = calculate_maximum_inconsistencies(Z, R, 1, xp)
+        xp_assert_close(MD, expectedMD, atol=1e-15)
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_maxRstat_Q_linkage(self, xp):
+        for method in ['single', 'complete', 'ward', 'centroid', 'median']:
+            for i in range(4):
+                self.check_maxRstat_Q_linkage(method, i, xp)
+
+    def check_maxRstat_Q_linkage(self, method, i, xp):
+        # Tests maxRstat(Z, R, i) on the Q data set
+        X = xp.asarray(hierarchy_test_data.Q_X)
+        Z = linkage(X, method)
+        R = inconsistent(Z)
+        MD = maxRstat(Z, R, 1)
+        expectedMD = calculate_maximum_inconsistencies(Z, R, 1, xp)
+        xp_assert_close(MD, expectedMD, atol=1e-15)
+
+
+@skip_xp_backends(cpu_only=True)
+class TestDendrogram:
+
+    def test_dendrogram_single_linkage_tdist(self, xp):
+        # Tests dendrogram calculation on single linkage of the tdist data set.
+        Z = linkage(xp.asarray(hierarchy_test_data.ytdist), 'single')
+        R = dendrogram(Z, no_plot=True)
+        leaves = R["leaves"]
+        assert_equal(leaves, [2, 5, 1, 0, 3, 4])
+
+    def test_valid_orientation(self, xp):
+        Z = linkage(xp.asarray(hierarchy_test_data.ytdist), 'single')
+        assert_raises(ValueError, dendrogram, Z, orientation="foo")
+
+    def test_labels_as_array_or_list(self, xp):
+        # test for gh-12418
+        Z = linkage(xp.asarray(hierarchy_test_data.ytdist), 'single')
+        labels = [1, 3, 2, 6, 4, 5]
+        result1 = dendrogram(Z, labels=xp.asarray(labels), no_plot=True)
+        result2 = dendrogram(Z, labels=labels, no_plot=True)
+        assert result1 == result2
+
+    @pytest.mark.skipif(not have_matplotlib, reason="no matplotlib")
+    def test_valid_label_size(self, xp):
+        link = xp.asarray([
+            [0, 1, 1.0, 4],
+            [2, 3, 1.0, 5],
+            [4, 5, 2.0, 6],
+        ])
+        plt.figure()
+        with pytest.raises(ValueError) as exc_info:
+            dendrogram(link, labels=list(range(100)))
+        assert "Dimensions of Z and labels must be consistent."\
+               in str(exc_info.value)
+
+        with pytest.raises(
+                ValueError,
+                match="Dimensions of Z and labels must be consistent."):
+            dendrogram(link, labels=[])
+
+        plt.close()
+
+    @pytest.mark.skipif(not have_matplotlib, reason="no matplotlib")
+    def test_dendrogram_plot(self, xp):
+        for orientation in ['top', 'bottom', 'left', 'right']:
+            self.check_dendrogram_plot(orientation, xp)
+
+    def check_dendrogram_plot(self, orientation, xp):
+        # Tests dendrogram plotting.
+        Z = linkage(xp.asarray(hierarchy_test_data.ytdist), 'single')
+        expected = {'color_list': ['C1', 'C0', 'C0', 'C0', 'C0'],
+                    'dcoord': [[0.0, 138.0, 138.0, 0.0],
+                               [0.0, 219.0, 219.0, 0.0],
+                               [0.0, 255.0, 255.0, 219.0],
+                               [0.0, 268.0, 268.0, 255.0],
+                               [138.0, 295.0, 295.0, 268.0]],
+                    'icoord': [[5.0, 5.0, 15.0, 15.0],
+                               [45.0, 45.0, 55.0, 55.0],
+                               [35.0, 35.0, 50.0, 50.0],
+                               [25.0, 25.0, 42.5, 42.5],
+                               [10.0, 10.0, 33.75, 33.75]],
+                    'ivl': ['2', '5', '1', '0', '3', '4'],
+                    'leaves': [2, 5, 1, 0, 3, 4],
+                    'leaves_color_list': ['C1', 'C1', 'C0', 'C0', 'C0', 'C0'],
+                    }
+
+        fig = plt.figure()
+        ax = fig.add_subplot(221)
+
+        # test that dendrogram accepts ax keyword
+        R1 = dendrogram(Z, ax=ax, orientation=orientation)
+        R1['dcoord'] = np.asarray(R1['dcoord'])
+        assert_equal(R1, expected)
+
+        # test that dendrogram accepts and handle the leaf_font_size and
+        # leaf_rotation keywords
+        dendrogram(Z, ax=ax, orientation=orientation,
+                   leaf_font_size=20, leaf_rotation=90)
+        testlabel = (
+            ax.get_xticklabels()[0]
+            if orientation in ['top', 'bottom']
+            else ax.get_yticklabels()[0]
+        )
+        assert_equal(testlabel.get_rotation(), 90)
+        assert_equal(testlabel.get_size(), 20)
+        dendrogram(Z, ax=ax, orientation=orientation,
+                   leaf_rotation=90)
+        testlabel = (
+            ax.get_xticklabels()[0]
+            if orientation in ['top', 'bottom']
+            else ax.get_yticklabels()[0]
+        )
+        assert_equal(testlabel.get_rotation(), 90)
+        dendrogram(Z, ax=ax, orientation=orientation,
+                   leaf_font_size=20)
+        testlabel = (
+            ax.get_xticklabels()[0]
+            if orientation in ['top', 'bottom']
+            else ax.get_yticklabels()[0]
+        )
+        assert_equal(testlabel.get_size(), 20)
+        plt.close()
+
+        # test plotting to gca (will import pylab)
+        R2 = dendrogram(Z, orientation=orientation)
+        plt.close()
+        R2['dcoord'] = np.asarray(R2['dcoord'])
+        assert_equal(R2, expected)
+
+    @pytest.mark.skipif(not have_matplotlib, reason="no matplotlib")
+    def test_dendrogram_truncate_mode(self, xp):
+        Z = linkage(xp.asarray(hierarchy_test_data.ytdist), 'single')
+
+        R = dendrogram(Z, 2, 'lastp', show_contracted=True)
+        plt.close()
+        R['dcoord'] = np.asarray(R['dcoord'])
+        assert_equal(R, {'color_list': ['C0'],
+                         'dcoord': [[0.0, 295.0, 295.0, 0.0]],
+                         'icoord': [[5.0, 5.0, 15.0, 15.0]],
+                         'ivl': ['(2)', '(4)'],
+                         'leaves': [6, 9],
+                         'leaves_color_list': ['C0', 'C0'],
+                         })
+
+        R = dendrogram(Z, 2, 'mtica', show_contracted=True)
+        plt.close()
+        R['dcoord'] = np.asarray(R['dcoord'])
+        assert_equal(R, {'color_list': ['C1', 'C0', 'C0', 'C0'],
+                         'dcoord': [[0.0, 138.0, 138.0, 0.0],
+                                    [0.0, 255.0, 255.0, 0.0],
+                                    [0.0, 268.0, 268.0, 255.0],
+                                    [138.0, 295.0, 295.0, 268.0]],
+                         'icoord': [[5.0, 5.0, 15.0, 15.0],
+                                    [35.0, 35.0, 45.0, 45.0],
+                                    [25.0, 25.0, 40.0, 40.0],
+                                    [10.0, 10.0, 32.5, 32.5]],
+                         'ivl': ['2', '5', '1', '0', '(2)'],
+                         'leaves': [2, 5, 1, 0, 7],
+                         'leaves_color_list': ['C1', 'C1', 'C0', 'C0', 'C0'],
+                         })
+
+    def test_dendrogram_colors(self, xp):
+        # Tests dendrogram plots with alternate colors
+        Z = linkage(xp.asarray(hierarchy_test_data.ytdist), 'single')
+
+        set_link_color_palette(['c', 'm', 'y', 'k'])
+        R = dendrogram(Z, no_plot=True,
+                       above_threshold_color='g', color_threshold=250)
+        set_link_color_palette(['g', 'r', 'c', 'm', 'y', 'k'])
+
+        color_list = R['color_list']
+        assert_equal(color_list, ['c', 'm', 'g', 'g', 'g'])
+
+        # reset color palette (global list)
+        set_link_color_palette(None)
+
+    def test_dendrogram_leaf_colors_zero_dist(self, xp):
+        # tests that the colors of leafs are correct for tree
+        # with two identical points
+        x = xp.asarray([[1, 0, 0],
+                        [0, 0, 1],
+                        [0, 2, 0],
+                        [0, 0, 1],
+                        [0, 1, 0],
+                        [0, 1, 0]])
+        z = linkage(x, "single")
+        d = dendrogram(z, no_plot=True)
+        exp_colors = ['C0', 'C1', 'C1', 'C0', 'C2', 'C2']
+        colors = d["leaves_color_list"]
+        assert_equal(colors, exp_colors)
+
+    def test_dendrogram_leaf_colors(self, xp):
+        # tests that the colors are correct for a tree
+        # with two near points ((0, 0, 1.1) and (0, 0, 1))
+        x = xp.asarray([[1, 0, 0],
+                        [0, 0, 1.1],
+                        [0, 2, 0],
+                        [0, 0, 1],
+                        [0, 1, 0],
+                        [0, 1, 0]])
+        z = linkage(x, "single")
+        d = dendrogram(z, no_plot=True)
+        exp_colors = ['C0', 'C1', 'C1', 'C0', 'C2', 'C2']
+        colors = d["leaves_color_list"]
+        assert_equal(colors, exp_colors)
+
+
+def calculate_maximum_distances(Z, xp):
+    # Used for testing correctness of maxdists.
+    n = Z.shape[0] + 1
+    B = xp.zeros((n-1,), dtype=Z.dtype)
+    q = xp.zeros((3,))
+    for i in range(0, n - 1):
+        q[:] = 0.0
+        left = Z[i, 0]
+        right = Z[i, 1]
+        if left >= n:
+            q[0] = B[xp.asarray(left, dtype=xp.int64) - n]
+        if right >= n:
+            q[1] = B[xp.asarray(right, dtype=xp.int64) - n]
+        q[2] = Z[i, 2]
+        B[i] = xp.max(q)
+    return B
+
+
+def calculate_maximum_inconsistencies(Z, R, k=3, xp=np):
+    # Used for testing correctness of maxinconsts.
+    n = Z.shape[0] + 1
+    dtype = xp.result_type(Z, R)
+    B = xp.zeros((n-1,), dtype=dtype)
+    q = xp.zeros((3,))
+    for i in range(0, n - 1):
+        q[:] = 0.0
+        left = Z[i, 0]
+        right = Z[i, 1]
+        if left >= n:
+            q[0] = B[xp.asarray(left, dtype=xp.int64) - n]
+        if right >= n:
+            q[1] = B[xp.asarray(right, dtype=xp.int64) - n]
+        q[2] = R[i, k]
+        B[i] = xp.max(q)
+    return B
+
+
+@skip_xp_backends(cpu_only=True)
+def test_unsupported_uncondensed_distance_matrix_linkage_warning(xp):
+    assert_warns(ClusterWarning, linkage, xp.asarray([[0, 1], [1, 0]]))
+
+
+def test_euclidean_linkage_value_error(xp):
+    for method in scipy.cluster.hierarchy._EUCLIDEAN_METHODS:
+        assert_raises(ValueError, linkage, xp.asarray([[1, 1], [1, 1]]),
+                      method=method, metric='cityblock')
+
+
+@skip_xp_backends(cpu_only=True)
+def test_2x2_linkage(xp):
+    Z1 = linkage(xp.asarray([1]), method='single', metric='euclidean')
+    Z2 = linkage(xp.asarray([[0, 1], [0, 0]]), method='single', metric='euclidean')
+    xp_assert_close(Z1, Z2, rtol=1e-15)
+
+
+@skip_xp_backends(cpu_only=True)
+def test_node_compare(xp):
+    np.random.seed(23)
+    nobs = 50
+    X = np.random.randn(nobs, 4)
+    X = xp.asarray(X)
+    Z = scipy.cluster.hierarchy.ward(X)
+    tree = to_tree(Z)
+    assert_(tree > tree.get_left())
+    assert_(tree.get_right() > tree.get_left())
+    assert_(tree.get_right() == tree.get_right())
+    assert_(tree.get_right() != tree.get_left())
+
+
+@skip_xp_backends(np_only=True, reasons=['`cut_tree` uses non-standard indexing'])
+def test_cut_tree(xp):
+    np.random.seed(23)
+    nobs = 50
+    X = np.random.randn(nobs, 4)
+    X = xp.asarray(X)
+    Z = scipy.cluster.hierarchy.ward(X)
+    cutree = cut_tree(Z)
+
+    # cutree.dtype varies between int32 and int64 over platforms
+    xp_assert_close(cutree[:, 0], xp.arange(nobs), rtol=1e-15, check_dtype=False)
+    xp_assert_close(cutree[:, -1], xp.zeros(nobs), rtol=1e-15, check_dtype=False)
+    assert_equal(np.asarray(cutree).max(0), np.arange(nobs - 1, -1, -1))
+
+    xp_assert_close(cutree[:, [-5]], cut_tree(Z, n_clusters=5), rtol=1e-15)
+    xp_assert_close(cutree[:, [-5, -10]], cut_tree(Z, n_clusters=[5, 10]), rtol=1e-15)
+    xp_assert_close(cutree[:, [-10, -5]], cut_tree(Z, n_clusters=[10, 5]), rtol=1e-15)
+
+    nodes = _order_cluster_tree(Z)
+    heights = xp.asarray([node.dist for node in nodes])
+
+    xp_assert_close(cutree[:, np.searchsorted(heights, [5])],
+                    cut_tree(Z, height=5), rtol=1e-15)
+    xp_assert_close(cutree[:, np.searchsorted(heights, [5, 10])],
+                    cut_tree(Z, height=[5, 10]), rtol=1e-15)
+    xp_assert_close(cutree[:, np.searchsorted(heights, [10, 5])],
+                    cut_tree(Z, height=[10, 5]), rtol=1e-15)
+
+
+@skip_xp_backends(cpu_only=True)
+def test_optimal_leaf_ordering(xp):
+    # test with the distance vector y
+    Z = optimal_leaf_ordering(linkage(xp.asarray(hierarchy_test_data.ytdist)),
+                              xp.asarray(hierarchy_test_data.ytdist))
+    expectedZ = hierarchy_test_data.linkage_ytdist_single_olo
+    xp_assert_close(Z, xp.asarray(expectedZ), atol=1e-10)
+
+    # test with the observation matrix X
+    Z = optimal_leaf_ordering(linkage(xp.asarray(hierarchy_test_data.X), 'ward'),
+                              xp.asarray(hierarchy_test_data.X))
+    expectedZ = hierarchy_test_data.linkage_X_ward_olo
+    xp_assert_close(Z, xp.asarray(expectedZ), atol=1e-06)
+
+
+@skip_xp_backends(np_only=True, reasons=['`Heap` only supports NumPy backend'])
+def test_Heap(xp):
+    values = xp.asarray([2, -1, 0, -1.5, 3])
+    heap = Heap(values)
+
+    pair = heap.get_min()
+    assert_equal(pair['key'], 3)
+    assert_equal(pair['value'], -1.5)
+
+    heap.remove_min()
+    pair = heap.get_min()
+    assert_equal(pair['key'], 1)
+    assert_equal(pair['value'], -1)
+
+    heap.change_value(1, 2.5)
+    pair = heap.get_min()
+    assert_equal(pair['key'], 2)
+    assert_equal(pair['value'], 0)
+
+    heap.remove_min()
+    heap.remove_min()
+
+    heap.change_value(1, 10)
+    pair = heap.get_min()
+    assert_equal(pair['key'], 4)
+    assert_equal(pair['value'], 3)
+
+    heap.remove_min()
+    pair = heap.get_min()
+    assert_equal(pair['key'], 1)
+    assert_equal(pair['value'], 10)

parrot/lib/python3.10/site-packages/scipy/cluster/tests/test_vq.py

@@ -0,0 +1,435 @@
+import warnings
+import sys
+from copy import deepcopy
+
+import numpy as np
+from numpy.testing import (
+    assert_array_equal, assert_equal, assert_, suppress_warnings
+)
+import pytest
+from pytest import raises as assert_raises
+
+from scipy.cluster.vq import (kmeans, kmeans2, py_vq, vq, whiten,
+                              ClusterError, _krandinit)
+from scipy.cluster import _vq
+from scipy.conftest import array_api_compatible
+from scipy.sparse._sputils import matrix
+
+from scipy._lib._array_api import (
+    SCIPY_ARRAY_API, copy, cov, xp_assert_close, xp_assert_equal
+)
+
+pytestmark = [array_api_compatible, pytest.mark.usefixtures("skip_xp_backends")]
+skip_xp_backends = pytest.mark.skip_xp_backends
+
+TESTDATA_2D = np.array([
+    -2.2, 1.17, -1.63, 1.69, -2.04, 4.38, -3.09, 0.95, -1.7, 4.79, -1.68, 0.68,
+    -2.26, 3.34, -2.29, 2.55, -1.72, -0.72, -1.99, 2.34, -2.75, 3.43, -2.45,
+    2.41, -4.26, 3.65, -1.57, 1.87, -1.96, 4.03, -3.01, 3.86, -2.53, 1.28,
+    -4.0, 3.95, -1.62, 1.25, -3.42, 3.17, -1.17, 0.12, -3.03, -0.27, -2.07,
+    -0.55, -1.17, 1.34, -2.82, 3.08, -2.44, 0.24, -1.71, 2.48, -5.23, 4.29,
+    -2.08, 3.69, -1.89, 3.62, -2.09, 0.26, -0.92, 1.07, -2.25, 0.88, -2.25,
+    2.02, -4.31, 3.86, -2.03, 3.42, -2.76, 0.3, -2.48, -0.29, -3.42, 3.21,
+    -2.3, 1.73, -2.84, 0.69, -1.81, 2.48, -5.24, 4.52, -2.8, 1.31, -1.67,
+    -2.34, -1.18, 2.17, -2.17, 2.82, -1.85, 2.25, -2.45, 1.86, -6.79, 3.94,
+    -2.33, 1.89, -1.55, 2.08, -1.36, 0.93, -2.51, 2.74, -2.39, 3.92, -3.33,
+    2.99, -2.06, -0.9, -2.83, 3.35, -2.59, 3.05, -2.36, 1.85, -1.69, 1.8,
+    -1.39, 0.66, -2.06, 0.38, -1.47, 0.44, -4.68, 3.77, -5.58, 3.44, -2.29,
+    2.24, -1.04, -0.38, -1.85, 4.23, -2.88, 0.73, -2.59, 1.39, -1.34, 1.75,
+    -1.95, 1.3, -2.45, 3.09, -1.99, 3.41, -5.55, 5.21, -1.73, 2.52, -2.17,
+    0.85, -2.06, 0.49, -2.54, 2.07, -2.03, 1.3, -3.23, 3.09, -1.55, 1.44,
+    -0.81, 1.1, -2.99, 2.92, -1.59, 2.18, -2.45, -0.73, -3.12, -1.3, -2.83,
+    0.2, -2.77, 3.24, -1.98, 1.6, -4.59, 3.39, -4.85, 3.75, -2.25, 1.71, -3.28,
+    3.38, -1.74, 0.88, -2.41, 1.92, -2.24, 1.19, -2.48, 1.06, -1.68, -0.62,
+    -1.3, 0.39, -1.78, 2.35, -3.54, 2.44, -1.32, 0.66, -2.38, 2.76, -2.35,
+    3.95, -1.86, 4.32, -2.01, -1.23, -1.79, 2.76, -2.13, -0.13, -5.25, 3.84,
+    -2.24, 1.59, -4.85, 2.96, -2.41, 0.01, -0.43, 0.13, -3.92, 2.91, -1.75,
+    -0.53, -1.69, 1.69, -1.09, 0.15, -2.11, 2.17, -1.53, 1.22, -2.1, -0.86,
+    -2.56, 2.28, -3.02, 3.33, -1.12, 3.86, -2.18, -1.19, -3.03, 0.79, -0.83,
+    0.97, -3.19, 1.45, -1.34, 1.28, -2.52, 4.22, -4.53, 3.22, -1.97, 1.75,
+    -2.36, 3.19, -0.83, 1.53, -1.59, 1.86, -2.17, 2.3, -1.63, 2.71, -2.03,
+    3.75, -2.57, -0.6, -1.47, 1.33, -1.95, 0.7, -1.65, 1.27, -1.42, 1.09, -3.0,
+    3.87, -2.51, 3.06, -2.6, 0.74, -1.08, -0.03, -2.44, 1.31, -2.65, 2.99,
+    -1.84, 1.65, -4.76, 3.75, -2.07, 3.98, -2.4, 2.67, -2.21, 1.49, -1.21,
+    1.22, -5.29, 2.38, -2.85, 2.28, -5.6, 3.78, -2.7, 0.8, -1.81, 3.5, -3.75,
+    4.17, -1.29, 2.99, -5.92, 3.43, -1.83, 1.23, -1.24, -1.04, -2.56, 2.37,
+    -3.26, 0.39, -4.63, 2.51, -4.52, 3.04, -1.7, 0.36, -1.41, 0.04, -2.1, 1.0,
+    -1.87, 3.78, -4.32, 3.59, -2.24, 1.38, -1.99, -0.22, -1.87, 1.95, -0.84,
+    2.17, -5.38, 3.56, -1.27, 2.9, -1.79, 3.31, -5.47, 3.85, -1.44, 3.69,
+    -2.02, 0.37, -1.29, 0.33, -2.34, 2.56, -1.74, -1.27, -1.97, 1.22, -2.51,
+    -0.16, -1.64, -0.96, -2.99, 1.4, -1.53, 3.31, -2.24, 0.45, -2.46, 1.71,
+    -2.88, 1.56, -1.63, 1.46, -1.41, 0.68, -1.96, 2.76, -1.61,
+    2.11]).reshape((200, 2))
+
+
+# Global data
+X = np.array([[3.0, 3], [4, 3], [4, 2],
+              [9, 2], [5, 1], [6, 2], [9, 4],
+              [5, 2], [5, 4], [7, 4], [6, 5]])
+
+CODET1 = np.array([[3.0000, 3.0000],
+                   [6.2000, 4.0000],
+                   [5.8000, 1.8000]])
+
+CODET2 = np.array([[11.0/3, 8.0/3],
+                   [6.7500, 4.2500],
+                   [6.2500, 1.7500]])
+
+LABEL1 = np.array([0, 1, 2, 2, 2, 2, 1, 2, 1, 1, 1])
+
+
+class TestWhiten:
+
+    def test_whiten(self, xp):
+        desired = xp.asarray([[5.08738849, 2.97091878],
+                            [3.19909255, 0.69660580],
+                            [4.51041982, 0.02640918],
+                            [4.38567074, 0.95120889],
+                            [2.32191480, 1.63195503]])
+
+        obs = xp.asarray([[0.98744510, 0.82766775],
+                          [0.62093317, 0.19406729],
+                          [0.87545741, 0.00735733],
+                          [0.85124403, 0.26499712],
+                          [0.45067590, 0.45464607]])
+        xp_assert_close(whiten(obs), desired, rtol=1e-5)
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'])
+    def test_whiten_zero_std(self, xp):
+        desired = xp.asarray([[0., 1.0, 2.86666544],
+                              [0., 1.0, 1.32460034],
+                              [0., 1.0, 3.74382172]])
+
+        obs = xp.asarray([[0., 1., 0.74109533],
+                          [0., 1., 0.34243798],
+                          [0., 1., 0.96785929]])
+        with warnings.catch_warnings(record=True) as w:
+            warnings.simplefilter('always')
+
+            xp_assert_close(whiten(obs), desired, rtol=1e-5)
+
+            assert_equal(len(w), 1)
+            assert_(issubclass(w[-1].category, RuntimeWarning))
+
+    def test_whiten_not_finite(self, xp):
+        for bad_value in xp.nan, xp.inf, -xp.inf:
+            obs = xp.asarray([[0.98744510, bad_value],
+                              [0.62093317, 0.19406729],
+                              [0.87545741, 0.00735733],
+                              [0.85124403, 0.26499712],
+                              [0.45067590, 0.45464607]])
+            assert_raises(ValueError, whiten, obs)
+
+    @pytest.mark.skipif(SCIPY_ARRAY_API,
+                        reason='`np.matrix` unsupported in array API mode')
+    def test_whiten_not_finite_matrix(self, xp):
+        for bad_value in np.nan, np.inf, -np.inf:
+            obs = matrix([[0.98744510, bad_value],
+                          [0.62093317, 0.19406729],
+                          [0.87545741, 0.00735733],
+                          [0.85124403, 0.26499712],
+                          [0.45067590, 0.45464607]])
+            assert_raises(ValueError, whiten, obs)
+
+
+class TestVq:
+
+    @skip_xp_backends(cpu_only=True)
+    def test_py_vq(self, xp):
+        initc = np.concatenate([[X[0]], [X[1]], [X[2]]])
+        # label1.dtype varies between int32 and int64 over platforms
+        label1 = py_vq(xp.asarray(X), xp.asarray(initc))[0]
+        xp_assert_equal(label1, xp.asarray(LABEL1, dtype=xp.int64),
+                        check_dtype=False)
+
+    @pytest.mark.skipif(SCIPY_ARRAY_API,
+                        reason='`np.matrix` unsupported in array API mode')
+    def test_py_vq_matrix(self, xp):
+        initc = np.concatenate([[X[0]], [X[1]], [X[2]]])
+        # label1.dtype varies between int32 and int64 over platforms
+        label1 = py_vq(matrix(X), matrix(initc))[0]
+        assert_array_equal(label1, LABEL1)
+
+    @skip_xp_backends(np_only=True, reasons=['`_vq` only supports NumPy backend'])
+    def test_vq(self, xp):
+        initc = np.concatenate([[X[0]], [X[1]], [X[2]]])
+        label1, _ = _vq.vq(xp.asarray(X), xp.asarray(initc))
+        assert_array_equal(label1, LABEL1)
+        _, _ = vq(xp.asarray(X), xp.asarray(initc))
+
+    @pytest.mark.skipif(SCIPY_ARRAY_API,
+                        reason='`np.matrix` unsupported in array API mode')
+    def test_vq_matrix(self, xp):
+        initc = np.concatenate([[X[0]], [X[1]], [X[2]]])
+        label1, _ = _vq.vq(matrix(X), matrix(initc))
+        assert_array_equal(label1, LABEL1)
+        _, _ = vq(matrix(X), matrix(initc))
+
+    @skip_xp_backends(cpu_only=True)
+    def test_vq_1d(self, xp):
+        # Test special rank 1 vq algo, python implementation.
+        data = X[:, 0]
+        initc = data[:3]
+        a, b = _vq.vq(data, initc)
+        data = xp.asarray(data)
+        initc = xp.asarray(initc)
+        ta, tb = py_vq(data[:, np.newaxis], initc[:, np.newaxis])
+        # ta.dtype varies between int32 and int64 over platforms
+        xp_assert_equal(ta, xp.asarray(a, dtype=xp.int64), check_dtype=False)
+        xp_assert_equal(tb, xp.asarray(b))
+
+    @skip_xp_backends(np_only=True, reasons=['`_vq` only supports NumPy backend'])
+    def test__vq_sametype(self, xp):
+        a = xp.asarray([1.0, 2.0], dtype=xp.float64)
+        b = a.astype(xp.float32)
+        assert_raises(TypeError, _vq.vq, a, b)
+
+    @skip_xp_backends(np_only=True, reasons=['`_vq` only supports NumPy backend'])
+    def test__vq_invalid_type(self, xp):
+        a = xp.asarray([1, 2], dtype=int)
+        assert_raises(TypeError, _vq.vq, a, a)
+
+    @skip_xp_backends(cpu_only=True)
+    def test_vq_large_nfeat(self, xp):
+        X = np.random.rand(20, 20)
+        code_book = np.random.rand(3, 20)
+
+        codes0, dis0 = _vq.vq(X, code_book)
+        codes1, dis1 = py_vq(
+            xp.asarray(X), xp.asarray(code_book)
+        )
+        xp_assert_close(dis1, xp.asarray(dis0), rtol=1e-5)
+        # codes1.dtype varies between int32 and int64 over platforms
+        xp_assert_equal(codes1, xp.asarray(codes0, dtype=xp.int64), check_dtype=False)
+
+        X = X.astype(np.float32)
+        code_book = code_book.astype(np.float32)
+
+        codes0, dis0 = _vq.vq(X, code_book)
+        codes1, dis1 = py_vq(
+            xp.asarray(X), xp.asarray(code_book)
+        )
+        xp_assert_close(dis1, xp.asarray(dis0, dtype=xp.float64), rtol=1e-5)
+        # codes1.dtype varies between int32 and int64 over platforms
+        xp_assert_equal(codes1, xp.asarray(codes0, dtype=xp.int64), check_dtype=False)
+
+    @skip_xp_backends(cpu_only=True)
+    def test_vq_large_features(self, xp):
+        X = np.random.rand(10, 5) * 1000000
+        code_book = np.random.rand(2, 5) * 1000000
+
+        codes0, dis0 = _vq.vq(X, code_book)
+        codes1, dis1 = py_vq(
+            xp.asarray(X), xp.asarray(code_book)
+        )
+        xp_assert_close(dis1, xp.asarray(dis0), rtol=1e-5)
+        # codes1.dtype varies between int32 and int64 over platforms
+        xp_assert_equal(codes1, xp.asarray(codes0, dtype=xp.int64), check_dtype=False)
+
+
+# Whole class skipped on GPU for now;
+# once pdist/cdist are hooked up for CuPy, more tests will work
+@skip_xp_backends(cpu_only=True)
+class TestKMean:
+
+    def test_large_features(self, xp):
+        # Generate a data set with large values, and run kmeans on it to
+        # (regression for 1077).
+        d = 300
+        n = 100
+
+        m1 = np.random.randn(d)
+        m2 = np.random.randn(d)
+        x = 10000 * np.random.randn(n, d) - 20000 * m1
+        y = 10000 * np.random.randn(n, d) + 20000 * m2
+
+        data = np.empty((x.shape[0] + y.shape[0], d), np.float64)
+        data[:x.shape[0]] = x
+        data[x.shape[0]:] = y
+
+        kmeans(xp.asarray(data), 2)
+
+    def test_kmeans_simple(self, xp):
+        np.random.seed(54321)
+        initc = np.concatenate([[X[0]], [X[1]], [X[2]]])
+        code1 = kmeans(xp.asarray(X), xp.asarray(initc), iter=1)[0]
+        xp_assert_close(code1, xp.asarray(CODET2))
+
+    @pytest.mark.skipif(SCIPY_ARRAY_API,
+                        reason='`np.matrix` unsupported in array API mode')
+    def test_kmeans_simple_matrix(self, xp):
+        np.random.seed(54321)
+        initc = np.concatenate([[X[0]], [X[1]], [X[2]]])
+        code1 = kmeans(matrix(X), matrix(initc), iter=1)[0]
+        xp_assert_close(code1, CODET2)
+
+    def test_kmeans_lost_cluster(self, xp):
+        # This will cause kmeans to have a cluster with no points.
+        data = xp.asarray(TESTDATA_2D)
+        initk = xp.asarray([[-1.8127404, -0.67128041],
+                            [2.04621601, 0.07401111],
+                            [-2.31149087, -0.05160469]])
+
+        kmeans(data, initk)
+        with suppress_warnings() as sup:
+            sup.filter(UserWarning,
+                       "One of the clusters is empty. Re-run kmeans with a "
+                       "different initialization")
+            kmeans2(data, initk, missing='warn')
+
+        assert_raises(ClusterError, kmeans2, data, initk, missing='raise')
+
+    def test_kmeans2_simple(self, xp):
+        np.random.seed(12345678)
+        initc = xp.asarray(np.concatenate([[X[0]], [X[1]], [X[2]]]))
+        arrays = [xp.asarray] if SCIPY_ARRAY_API else [np.asarray, matrix]
+        for tp in arrays:
+            code1 = kmeans2(tp(X), tp(initc), iter=1)[0]
+            code2 = kmeans2(tp(X), tp(initc), iter=2)[0]
+
+            xp_assert_close(code1, xp.asarray(CODET1))
+            xp_assert_close(code2, xp.asarray(CODET2))
+
+    @pytest.mark.skipif(SCIPY_ARRAY_API,
+                        reason='`np.matrix` unsupported in array API mode')
+    def test_kmeans2_simple_matrix(self, xp):
+        np.random.seed(12345678)
+        initc = xp.asarray(np.concatenate([[X[0]], [X[1]], [X[2]]]))
+        code1 = kmeans2(matrix(X), matrix(initc), iter=1)[0]
+        code2 = kmeans2(matrix(X), matrix(initc), iter=2)[0]
+
+        xp_assert_close(code1, CODET1)
+        xp_assert_close(code2, CODET2)
+
+    def test_kmeans2_rank1(self, xp):
+        data = xp.asarray(TESTDATA_2D)
+        data1 = data[:, 0]
+
+        initc = data1[:3]
+        code = copy(initc, xp=xp)
+        kmeans2(data1, code, iter=1)[0]
+        kmeans2(data1, code, iter=2)[0]
+
+    def test_kmeans2_rank1_2(self, xp):
+        data = xp.asarray(TESTDATA_2D)
+        data1 = data[:, 0]
+        kmeans2(data1, 2, iter=1)
+
+    def test_kmeans2_high_dim(self, xp):
+        # test kmeans2 when the number of dimensions exceeds the number
+        # of input points
+        data = xp.asarray(TESTDATA_2D)
+        data = xp.reshape(data, (20, 20))[:10, :]
+        kmeans2(data, 2)
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_kmeans2_init(self, xp):
+        np.random.seed(12345)
+        data = xp.asarray(TESTDATA_2D)
+        k = 3
+
+        kmeans2(data, k, minit='points')
+        kmeans2(data[:, 1], k, minit='points')  # special case (1-D)
+
+        kmeans2(data, k, minit='++')
+        kmeans2(data[:, 1], k, minit='++')  # special case (1-D)
+
+        # minit='random' can give warnings, filter those
+        with suppress_warnings() as sup:
+            sup.filter(message="One of the clusters is empty. Re-run.")
+            kmeans2(data, k, minit='random')
+            kmeans2(data[:, 1], k, minit='random')  # special case (1-D)
+
+    @pytest.mark.skipif(sys.platform == 'win32',
+                        reason='Fails with MemoryError in Wine.')
+    def test_krandinit(self, xp):
+        data = xp.asarray(TESTDATA_2D)
+        datas = [xp.reshape(data, (200, 2)),
+                 xp.reshape(data, (20, 20))[:10, :]]
+        k = int(1e6)
+        for data in datas:
+            rng = np.random.default_rng(1234)
+            init = _krandinit(data, k, rng, xp)
+            orig_cov = cov(data.T)
+            init_cov = cov(init.T)
+            xp_assert_close(orig_cov, init_cov, atol=1.1e-2)
+
+    def test_kmeans2_empty(self, xp):
+        # Regression test for gh-1032.
+        assert_raises(ValueError, kmeans2, xp.asarray([]), 2)
+
+    def test_kmeans_0k(self, xp):
+        # Regression test for gh-1073: fail when k arg is 0.
+        assert_raises(ValueError, kmeans, xp.asarray(X), 0)
+        assert_raises(ValueError, kmeans2, xp.asarray(X), 0)
+        assert_raises(ValueError, kmeans2, xp.asarray(X), xp.asarray([]))
+
+    def test_kmeans_large_thres(self, xp):
+        # Regression test for gh-1774
+        x = xp.asarray([1, 2, 3, 4, 10], dtype=xp.float64)
+        res = kmeans(x, 1, thresh=1e16)
+        xp_assert_close(res[0], xp.asarray([4.], dtype=xp.float64))
+        xp_assert_close(res[1], xp.asarray(2.3999999999999999, dtype=xp.float64)[()])
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_kmeans2_kpp_low_dim(self, xp):
+        # Regression test for gh-11462
+        prev_res = xp.asarray([[-1.95266667, 0.898],
+                               [-3.153375, 3.3945]], dtype=xp.float64)
+        np.random.seed(42)
+        res, _ = kmeans2(xp.asarray(TESTDATA_2D), 2, minit='++')
+        xp_assert_close(res, prev_res)
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_kmeans2_kpp_high_dim(self, xp):
+        # Regression test for gh-11462
+        n_dim = 100
+        size = 10
+        centers = np.vstack([5 * np.ones(n_dim),
+                             -5 * np.ones(n_dim)])
+        np.random.seed(42)
+        data = np.vstack([
+            np.random.multivariate_normal(centers[0], np.eye(n_dim), size=size),
+            np.random.multivariate_normal(centers[1], np.eye(n_dim), size=size)
+        ])
+
+        data = xp.asarray(data)
+        res, _ = kmeans2(data, 2, minit='++')
+        xp_assert_equal(xp.sign(res), xp.sign(xp.asarray(centers)))
+
+    def test_kmeans_diff_convergence(self, xp):
+        # Regression test for gh-8727
+        obs = xp.asarray([-3, -1, 0, 1, 1, 8], dtype=xp.float64)
+        res = kmeans(obs, xp.asarray([-3., 0.99]))
+        xp_assert_close(res[0], xp.asarray([-0.4,  8.], dtype=xp.float64))
+        xp_assert_close(res[1], xp.asarray(1.0666666666666667, dtype=xp.float64)[()])
+
+    @skip_xp_backends('jax.numpy',
+                      reasons=['jax arrays do not support item assignment'],
+                      cpu_only=True)
+    def test_kmeans_and_kmeans2_random_seed(self, xp):
+
+        seed_list = [
+            1234, np.random.RandomState(1234), np.random.default_rng(1234)
+        ]
+
+        for seed in seed_list:
+            seed1 = deepcopy(seed)
+            seed2 = deepcopy(seed)
+            data = xp.asarray(TESTDATA_2D)
+            # test for kmeans
+            res1, _ = kmeans(data, 2, seed=seed1)
+            res2, _ = kmeans(data, 2, seed=seed2)
+            xp_assert_close(res1, res2)  # should be same results
+            # test for kmeans2
+            for minit in ["random", "points", "++"]:
+                res1, _ = kmeans2(data, 2, minit=minit, seed=seed1)
+                res2, _ = kmeans2(data, 2, minit=minit, seed=seed2)
+                xp_assert_close(res1, res2)  # should be same results

parrot/lib/python3.10/site-packages/scipy/cluster/vq.py

@@ -0,0 +1,835 @@
+"""
+K-means clustering and vector quantization (:mod:`scipy.cluster.vq`)
+====================================================================
+
+Provides routines for k-means clustering, generating code books
+from k-means models and quantizing vectors by comparing them with
+centroids in a code book.
+
+.. autosummary::
+   :toctree: generated/
+
+   whiten -- Normalize a group of observations so each feature has unit variance
+   vq -- Calculate code book membership of a set of observation vectors
+   kmeans -- Perform k-means on a set of observation vectors forming k clusters
+   kmeans2 -- A different implementation of k-means with more methods
+           -- for initializing centroids
+
+Background information
+----------------------
+The k-means algorithm takes as input the number of clusters to
+generate, k, and a set of observation vectors to cluster. It
+returns a set of centroids, one for each of the k clusters. An
+observation vector is classified with the cluster number or
+centroid index of the centroid closest to it.
+
+A vector v belongs to cluster i if it is closer to centroid i than
+any other centroid. If v belongs to i, we say centroid i is the
+dominating centroid of v. The k-means algorithm tries to
+minimize distortion, which is defined as the sum of the squared distances
+between each observation vector and its dominating centroid.
+The minimization is achieved by iteratively reclassifying
+the observations into clusters and recalculating the centroids until
+a configuration is reached in which the centroids are stable. One can
+also define a maximum number of iterations.
+
+Since vector quantization is a natural application for k-means,
+information theory terminology is often used. The centroid index
+or cluster index is also referred to as a "code" and the table
+mapping codes to centroids and, vice versa, is often referred to as a
+"code book". The result of k-means, a set of centroids, can be
+used to quantize vectors. Quantization aims to find an encoding of
+vectors that reduces the expected distortion.
+
+All routines expect obs to be an M by N array, where the rows are
+the observation vectors. The codebook is a k by N array, where the
+ith row is the centroid of code word i. The observation vectors
+and centroids have the same feature dimension.
+
+As an example, suppose we wish to compress a 24-bit color image
+(each pixel is represented by one byte for red, one for blue, and
+one for green) before sending it over the web. By using a smaller
+8-bit encoding, we can reduce the amount of data by two
+thirds. Ideally, the colors for each of the 256 possible 8-bit
+encoding values should be chosen to minimize distortion of the
+color. Running k-means with k=256 generates a code book of 256
+codes, which fills up all possible 8-bit sequences. Instead of
+sending a 3-byte value for each pixel, the 8-bit centroid index
+(or code word) of the dominating centroid is transmitted. The code
+book is also sent over the wire so each 8-bit code can be
+translated back to a 24-bit pixel value representation. If the
+image of interest was of an ocean, we would expect many 24-bit
+blues to be represented by 8-bit codes. If it was an image of a
+human face, more flesh-tone colors would be represented in the
+code book.
+
+"""
+import warnings
+import numpy as np
+from collections import deque
+from scipy._lib._array_api import (
+    _asarray, array_namespace, size, atleast_nd, copy, cov
+)
+from scipy._lib._util import check_random_state, rng_integers
+from scipy.spatial.distance import cdist
+
+from . import _vq
+
+__docformat__ = 'restructuredtext'
+
+__all__ = ['whiten', 'vq', 'kmeans', 'kmeans2']
+
+
+class ClusterError(Exception):
+    pass
+
+
+def whiten(obs, check_finite=True):
+    """
+    Normalize a group of observations on a per feature basis.
+
+    Before running k-means, it is beneficial to rescale each feature
+    dimension of the observation set by its standard deviation (i.e. "whiten"
+    it - as in "white noise" where each frequency has equal power).
+    Each feature is divided by its standard deviation across all observations
+    to give it unit variance.
+
+    Parameters
+    ----------
+    obs : ndarray
+        Each row of the array is an observation.  The
+        columns are the features seen during each observation.
+
+        >>> #         f0    f1    f2
+        >>> obs = [[  1.,   1.,   1.],  #o0
+        ...        [  2.,   2.,   2.],  #o1
+        ...        [  3.,   3.,   3.],  #o2
+        ...        [  4.,   4.,   4.]]  #o3
+
+    check_finite : bool, optional
+        Whether to check that the input matrices contain only finite numbers.
+        Disabling may give a performance gain, but may result in problems
+        (crashes, non-termination) if the inputs do contain infinities or NaNs.
+        Default: True
+
+    Returns
+    -------
+    result : ndarray
+        Contains the values in `obs` scaled by the standard deviation
+        of each column.
+
+    Examples
+    --------
+    >>> import numpy as np
+    >>> from scipy.cluster.vq import whiten
+    >>> features  = np.array([[1.9, 2.3, 1.7],
+    ...                       [1.5, 2.5, 2.2],
+    ...                       [0.8, 0.6, 1.7,]])
+    >>> whiten(features)
+    array([[ 4.17944278,  2.69811351,  7.21248917],
+           [ 3.29956009,  2.93273208,  9.33380951],
+           [ 1.75976538,  0.7038557 ,  7.21248917]])
+
+    """
+    xp = array_namespace(obs)
+    obs = _asarray(obs, check_finite=check_finite, xp=xp)
+    std_dev = xp.std(obs, axis=0)
+    zero_std_mask = std_dev == 0
+    if xp.any(zero_std_mask):
+        std_dev[zero_std_mask] = 1.0
+        warnings.warn("Some columns have standard deviation zero. "
+                      "The values of these columns will not change.",
+                      RuntimeWarning, stacklevel=2)
+    return obs / std_dev
+
+
+def vq(obs, code_book, check_finite=True):
+    """
+    Assign codes from a code book to observations.
+
+    Assigns a code from a code book to each observation. Each
+    observation vector in the 'M' by 'N' `obs` array is compared with the
+    centroids in the code book and assigned the code of the closest
+    centroid.
+
+    The features in `obs` should have unit variance, which can be
+    achieved by passing them through the whiten function. The code
+    book can be created with the k-means algorithm or a different
+    encoding algorithm.
+
+    Parameters
+    ----------
+    obs : ndarray
+        Each row of the 'M' x 'N' array is an observation. The columns are
+        the "features" seen during each observation. The features must be
+        whitened first using the whiten function or something equivalent.
+    code_book : ndarray
+        The code book is usually generated using the k-means algorithm.
+        Each row of the array holds a different code, and the columns are
+        the features of the code.
+
+         >>> #              f0    f1    f2   f3
+         >>> code_book = [
+         ...             [  1.,   2.,   3.,   4.],  #c0
+         ...             [  1.,   2.,   3.,   4.],  #c1
+         ...             [  1.,   2.,   3.,   4.]]  #c2
+
+    check_finite : bool, optional
+        Whether to check that the input matrices contain only finite numbers.
+        Disabling may give a performance gain, but may result in problems
+        (crashes, non-termination) if the inputs do contain infinities or NaNs.
+        Default: True
+
+    Returns
+    -------
+    code : ndarray
+        A length M array holding the code book index for each observation.
+    dist : ndarray
+        The distortion (distance) between the observation and its nearest
+        code.
+
+    Examples
+    --------
+    >>> import numpy as np
+    >>> from scipy.cluster.vq import vq
+    >>> code_book = np.array([[1., 1., 1.],
+    ...                       [2., 2., 2.]])
+    >>> features  = np.array([[1.9, 2.3, 1.7],
+    ...                       [1.5, 2.5, 2.2],
+    ...                       [0.8, 0.6, 1.7]])
+    >>> vq(features, code_book)
+    (array([1, 1, 0], dtype=int32), array([0.43588989, 0.73484692, 0.83066239]))
+
+    """
+    xp = array_namespace(obs, code_book)
+    obs = _asarray(obs, xp=xp, check_finite=check_finite)
+    code_book = _asarray(code_book, xp=xp, check_finite=check_finite)
+    ct = xp.result_type(obs, code_book)
+
+    c_obs = xp.astype(obs, ct, copy=False)
+    c_code_book = xp.astype(code_book, ct, copy=False)
+
+    if xp.isdtype(ct, kind='real floating'):
+        c_obs = np.asarray(c_obs)
+        c_code_book = np.asarray(c_code_book)
+        result = _vq.vq(c_obs, c_code_book)
+        return xp.asarray(result[0]), xp.asarray(result[1])
+    return py_vq(obs, code_book, check_finite=False)
+
+
+def py_vq(obs, code_book, check_finite=True):
+    """ Python version of vq algorithm.
+
+    The algorithm computes the Euclidean distance between each
+    observation and every frame in the code_book.
+
+    Parameters
+    ----------
+    obs : ndarray
+        Expects a rank 2 array. Each row is one observation.
+    code_book : ndarray
+        Code book to use. Same format than obs. Should have same number of
+        features (e.g., columns) than obs.
+    check_finite : bool, optional
+        Whether to check that the input matrices contain only finite numbers.
+        Disabling may give a performance gain, but may result in problems
+        (crashes, non-termination) if the inputs do contain infinities or NaNs.
+        Default: True
+
+    Returns
+    -------
+    code : ndarray
+        code[i] gives the label of the ith obversation; its code is
+        code_book[code[i]].
+    mind_dist : ndarray
+        min_dist[i] gives the distance between the ith observation and its
+        corresponding code.
+
+    Notes
+    -----
+    This function is slower than the C version but works for
+    all input types. If the inputs have the wrong types for the
+    C versions of the function, this one is called as a last resort.
+
+    It is about 20 times slower than the C version.
+
+    """
+    xp = array_namespace(obs, code_book)
+    obs = _asarray(obs, xp=xp, check_finite=check_finite)
+    code_book = _asarray(code_book, xp=xp, check_finite=check_finite)
+
+    if obs.ndim != code_book.ndim:
+        raise ValueError("Observation and code_book should have the same rank")
+
+    if obs.ndim == 1:
+        obs = obs[:, xp.newaxis]
+        code_book = code_book[:, xp.newaxis]
+
+    # Once `cdist` has array API support, this `xp.asarray` call can be removed
+    dist = xp.asarray(cdist(obs, code_book))
+    code = xp.argmin(dist, axis=1)
+    min_dist = xp.min(dist, axis=1)
+    return code, min_dist
+
+
+def _kmeans(obs, guess, thresh=1e-5, xp=None):
+    """ "raw" version of k-means.
+
+    Returns
+    -------
+    code_book
+        The lowest distortion codebook found.
+    avg_dist
+        The average distance a observation is from a code in the book.
+        Lower means the code_book matches the data better.
+
+    See Also
+    --------
+    kmeans : wrapper around k-means
+
+    Examples
+    --------
+    Note: not whitened in this example.
+
+    >>> import numpy as np
+    >>> from scipy.cluster.vq import _kmeans
+    >>> features  = np.array([[ 1.9,2.3],
+    ...                       [ 1.5,2.5],
+    ...                       [ 0.8,0.6],
+    ...                       [ 0.4,1.8],
+    ...                       [ 1.0,1.0]])
+    >>> book = np.array((features[0],features[2]))
+    >>> _kmeans(features,book)
+    (array([[ 1.7       ,  2.4       ],
+           [ 0.73333333,  1.13333333]]), 0.40563916697728591)
+
+    """
+    xp = np if xp is None else xp
+    code_book = guess
+    diff = xp.inf
+    prev_avg_dists = deque([diff], maxlen=2)
+    while diff > thresh:
+        # compute membership and distances between obs and code_book
+        obs_code, distort = vq(obs, code_book, check_finite=False)
+        prev_avg_dists.append(xp.mean(distort, axis=-1))
+        # recalc code_book as centroids of associated obs
+        obs = np.asarray(obs)
+        obs_code = np.asarray(obs_code)
+        code_book, has_members = _vq.update_cluster_means(obs, obs_code,
+                                                          code_book.shape[0])
+        obs = xp.asarray(obs)
+        obs_code = xp.asarray(obs_code)
+        code_book = xp.asarray(code_book)
+        has_members = xp.asarray(has_members)
+        code_book = code_book[has_members]
+        diff = xp.abs(prev_avg_dists[0] - prev_avg_dists[1])
+
+    return code_book, prev_avg_dists[1]
+
+
+def kmeans(obs, k_or_guess, iter=20, thresh=1e-5, check_finite=True,
+           *, seed=None):
+    """
+    Performs k-means on a set of observation vectors forming k clusters.
+
+    The k-means algorithm adjusts the classification of the observations
+    into clusters and updates the cluster centroids until the position of
+    the centroids is stable over successive iterations. In this
+    implementation of the algorithm, the stability of the centroids is
+    determined by comparing the absolute value of the change in the average
+    Euclidean distance between the observations and their corresponding
+    centroids against a threshold. This yields
+    a code book mapping centroids to codes and vice versa.
+
+    Parameters
+    ----------
+    obs : ndarray
+       Each row of the M by N array is an observation vector. The
+       columns are the features seen during each observation.
+       The features must be whitened first with the `whiten` function.
+
+    k_or_guess : int or ndarray
+       The number of centroids to generate. A code is assigned to
+       each centroid, which is also the row index of the centroid
+       in the code_book matrix generated.
+
+       The initial k centroids are chosen by randomly selecting
+       observations from the observation matrix. Alternatively,
+       passing a k by N array specifies the initial k centroids.
+
+    iter : int, optional
+       The number of times to run k-means, returning the codebook
+       with the lowest distortion. This argument is ignored if
+       initial centroids are specified with an array for the
+       ``k_or_guess`` parameter. This parameter does not represent the
+       number of iterations of the k-means algorithm.
+
+    thresh : float, optional
+       Terminates the k-means algorithm if the change in
+       distortion since the last k-means iteration is less than
+       or equal to threshold.
+
+    check_finite : bool, optional
+        Whether to check that the input matrices contain only finite numbers.
+        Disabling may give a performance gain, but may result in problems
+        (crashes, non-termination) if the inputs do contain infinities or NaNs.
+        Default: True
+
+    seed : {None, int, `numpy.random.Generator`, `numpy.random.RandomState`}, optional
+        Seed for initializing the pseudo-random number generator.
+        If `seed` is None (or `numpy.random`), the `numpy.random.RandomState`
+        singleton is used.
+        If `seed` is an int, a new ``RandomState`` instance is used,
+        seeded with `seed`.
+        If `seed` is already a ``Generator`` or ``RandomState`` instance then
+        that instance is used.
+        The default is None.
+
+    Returns
+    -------
+    codebook : ndarray
+       A k by N array of k centroids. The ith centroid
+       codebook[i] is represented with the code i. The centroids
+       and codes generated represent the lowest distortion seen,
+       not necessarily the globally minimal distortion.
+       Note that the number of centroids is not necessarily the same as the
+       ``k_or_guess`` parameter, because centroids assigned to no observations
+       are removed during iterations.
+
+    distortion : float
+       The mean (non-squared) Euclidean distance between the observations
+       passed and the centroids generated. Note the difference to the standard
+       definition of distortion in the context of the k-means algorithm, which
+       is the sum of the squared distances.
+
+    See Also
+    --------
+    kmeans2 : a different implementation of k-means clustering
+       with more methods for generating initial centroids but without
+       using a distortion change threshold as a stopping criterion.
+
+    whiten : must be called prior to passing an observation matrix
+       to kmeans.
+
+    Notes
+    -----
+    For more functionalities or optimal performance, you can use
+    `sklearn.cluster.KMeans <https://scikit-learn.org/stable/modules/generated/sklearn.cluster.KMeans.html>`_.
+    `This <https://hdbscan.readthedocs.io/en/latest/performance_and_scalability.html#comparison-of-high-performance-implementations>`_
+    is a benchmark result of several implementations.
+
+    Examples
+    --------
+    >>> import numpy as np
+    >>> from scipy.cluster.vq import vq, kmeans, whiten
+    >>> import matplotlib.pyplot as plt
+    >>> features  = np.array([[ 1.9,2.3],
+    ...                       [ 1.5,2.5],
+    ...                       [ 0.8,0.6],
+    ...                       [ 0.4,1.8],
+    ...                       [ 0.1,0.1],
+    ...                       [ 0.2,1.8],
+    ...                       [ 2.0,0.5],
+    ...                       [ 0.3,1.5],
+    ...                       [ 1.0,1.0]])
+    >>> whitened = whiten(features)
+    >>> book = np.array((whitened[0],whitened[2]))
+    >>> kmeans(whitened,book)
+    (array([[ 2.3110306 ,  2.86287398],    # random
+           [ 0.93218041,  1.24398691]]), 0.85684700941625547)
+
+    >>> codes = 3
+    >>> kmeans(whitened,codes)
+    (array([[ 2.3110306 ,  2.86287398],    # random
+           [ 1.32544402,  0.65607529],
+           [ 0.40782893,  2.02786907]]), 0.5196582527686241)
+
+    >>> # Create 50 datapoints in two clusters a and b
+    >>> pts = 50
+    >>> rng = np.random.default_rng()
+    >>> a = rng.multivariate_normal([0, 0], [[4, 1], [1, 4]], size=pts)
+    >>> b = rng.multivariate_normal([30, 10],
+    ...                             [[10, 2], [2, 1]],
+    ...                             size=pts)
+    >>> features = np.concatenate((a, b))
+    >>> # Whiten data
+    >>> whitened = whiten(features)
+    >>> # Find 2 clusters in the data
+    >>> codebook, distortion = kmeans(whitened, 2)
+    >>> # Plot whitened data and cluster centers in red
+    >>> plt.scatter(whitened[:, 0], whitened[:, 1])
+    >>> plt.scatter(codebook[:, 0], codebook[:, 1], c='r')
+    >>> plt.show()
+
+    """
+    if isinstance(k_or_guess, int):
+        xp = array_namespace(obs)
+    else:
+        xp = array_namespace(obs, k_or_guess)
+    obs = _asarray(obs, xp=xp, check_finite=check_finite)
+    guess = _asarray(k_or_guess, xp=xp, check_finite=check_finite)
+    if iter < 1:
+        raise ValueError("iter must be at least 1, got %s" % iter)
+
+    # Determine whether a count (scalar) or an initial guess (array) was passed.
+    if size(guess) != 1:
+        if size(guess) < 1:
+            raise ValueError("Asked for 0 clusters. Initial book was %s" %
+                             guess)
+        return _kmeans(obs, guess, thresh=thresh, xp=xp)
+
+    # k_or_guess is a scalar, now verify that it's an integer
+    k = int(guess)
+    if k != guess:
+        raise ValueError("If k_or_guess is a scalar, it must be an integer.")
+    if k < 1:
+        raise ValueError("Asked for %d clusters." % k)
+
+    rng = check_random_state(seed)
+
+    # initialize best distance value to a large value
+    best_dist = xp.inf
+    for i in range(iter):
+        # the initial code book is randomly selected from observations
+        guess = _kpoints(obs, k, rng, xp)
+        book, dist = _kmeans(obs, guess, thresh=thresh, xp=xp)
+        if dist < best_dist:
+            best_book = book
+            best_dist = dist
+    return best_book, best_dist
+
+
+def _kpoints(data, k, rng, xp):
+    """Pick k points at random in data (one row = one observation).
+
+    Parameters
+    ----------
+    data : ndarray
+        Expect a rank 1 or 2 array. Rank 1 are assumed to describe one
+        dimensional data, rank 2 multidimensional data, in which case one
+        row is one observation.
+    k : int
+        Number of samples to generate.
+    rng : `numpy.random.Generator` or `numpy.random.RandomState`
+        Random number generator.
+
+    Returns
+    -------
+    x : ndarray
+        A 'k' by 'N' containing the initial centroids
+
+    """
+    idx = rng.choice(data.shape[0], size=int(k), replace=False)
+    # convert to array with default integer dtype (avoids numpy#25607)
+    idx = xp.asarray(idx, dtype=xp.asarray([1]).dtype)
+    return xp.take(data, idx, axis=0)
+
+
+def _krandinit(data, k, rng, xp):
+    """Returns k samples of a random variable whose parameters depend on data.
+
+    More precisely, it returns k observations sampled from a Gaussian random
+    variable whose mean and covariances are the ones estimated from the data.
+
+    Parameters
+    ----------
+    data : ndarray
+        Expect a rank 1 or 2 array. Rank 1 is assumed to describe 1-D
+        data, rank 2 multidimensional data, in which case one
+        row is one observation.
+    k : int
+        Number of samples to generate.
+    rng : `numpy.random.Generator` or `numpy.random.RandomState`
+        Random number generator.
+
+    Returns
+    -------
+    x : ndarray
+        A 'k' by 'N' containing the initial centroids
+
+    """
+    mu = xp.mean(data, axis=0)
+    k = np.asarray(k)
+
+    if data.ndim == 1:
+        _cov = cov(data)
+        x = rng.standard_normal(size=k)
+        x = xp.asarray(x)
+        x *= xp.sqrt(_cov)
+    elif data.shape[1] > data.shape[0]:
+        # initialize when the covariance matrix is rank deficient
+        _, s, vh = xp.linalg.svd(data - mu, full_matrices=False)
+        x = rng.standard_normal(size=(k, size(s)))
+        x = xp.asarray(x)
+        sVh = s[:, None] * vh / xp.sqrt(data.shape[0] - xp.asarray(1.))
+        x = x @ sVh
+    else:
+        _cov = atleast_nd(cov(data.T), ndim=2)
+
+        # k rows, d cols (one row = one obs)
+        # Generate k sample of a random variable ~ Gaussian(mu, cov)
+        x = rng.standard_normal(size=(k, size(mu)))
+        x = xp.asarray(x)
+        x = x @ xp.linalg.cholesky(_cov).T
+
+    x += mu
+    return x
+
+
+def _kpp(data, k, rng, xp):
+    """ Picks k points in the data based on the kmeans++ method.
+
+    Parameters
+    ----------
+    data : ndarray
+        Expect a rank 1 or 2 array. Rank 1 is assumed to describe 1-D
+        data, rank 2 multidimensional data, in which case one
+        row is one observation.
+    k : int
+        Number of samples to generate.
+    rng : `numpy.random.Generator` or `numpy.random.RandomState`
+        Random number generator.
+
+    Returns
+    -------
+    init : ndarray
+        A 'k' by 'N' containing the initial centroids.
+
+    References
+    ----------
+    .. [1] D. Arthur and S. Vassilvitskii, "k-means++: the advantages of
+       careful seeding", Proceedings of the Eighteenth Annual ACM-SIAM Symposium
+       on Discrete Algorithms, 2007.
+    """
+
+    ndim = len(data.shape)
+    if ndim == 1:
+        data = data[:, None]
+
+    dims = data.shape[1]
+
+    init = xp.empty((int(k), dims))
+
+    for i in range(k):
+        if i == 0:
+            init[i, :] = data[rng_integers(rng, data.shape[0]), :]
+
+        else:
+            D2 = cdist(init[:i,:], data, metric='sqeuclidean').min(axis=0)
+            probs = D2/D2.sum()
+            cumprobs = probs.cumsum()
+            r = rng.uniform()
+            cumprobs = np.asarray(cumprobs)
+            init[i, :] = data[np.searchsorted(cumprobs, r), :]
+
+    if ndim == 1:
+        init = init[:, 0]
+    return init
+
+
+_valid_init_meth = {'random': _krandinit, 'points': _kpoints, '++': _kpp}
+
+
+def _missing_warn():
+    """Print a warning when called."""
+    warnings.warn("One of the clusters is empty. "
+                  "Re-run kmeans with a different initialization.",
+                  stacklevel=3)
+
+
+def _missing_raise():
+    """Raise a ClusterError when called."""
+    raise ClusterError("One of the clusters is empty. "
+                       "Re-run kmeans with a different initialization.")
+
+
+_valid_miss_meth = {'warn': _missing_warn, 'raise': _missing_raise}
+
+
+def kmeans2(data, k, iter=10, thresh=1e-5, minit='random',
+            missing='warn', check_finite=True, *, seed=None):
+    """
+    Classify a set of observations into k clusters using the k-means algorithm.
+
+    The algorithm attempts to minimize the Euclidean distance between
+    observations and centroids. Several initialization methods are
+    included.
+
+    Parameters
+    ----------
+    data : ndarray
+        A 'M' by 'N' array of 'M' observations in 'N' dimensions or a length
+        'M' array of 'M' 1-D observations.
+    k : int or ndarray
+        The number of clusters to form as well as the number of
+        centroids to generate. If `minit` initialization string is
+        'matrix', or if a ndarray is given instead, it is
+        interpreted as initial cluster to use instead.
+    iter : int, optional
+        Number of iterations of the k-means algorithm to run. Note
+        that this differs in meaning from the iters parameter to
+        the kmeans function.
+    thresh : float, optional
+        (not used yet)
+    minit : str, optional
+        Method for initialization. Available methods are 'random',
+        'points', '++' and 'matrix':
+
+        'random': generate k centroids from a Gaussian with mean and
+        variance estimated from the data.
+
+        'points': choose k observations (rows) at random from data for
+        the initial centroids.
+
+        '++': choose k observations accordingly to the kmeans++ method
+        (careful seeding)
+
+        'matrix': interpret the k parameter as a k by M (or length k
+        array for 1-D data) array of initial centroids.
+    missing : str, optional
+        Method to deal with empty clusters. Available methods are
+        'warn' and 'raise':
+
+        'warn': give a warning and continue.
+
+        'raise': raise an ClusterError and terminate the algorithm.
+    check_finite : bool, optional
+        Whether to check that the input matrices contain only finite numbers.
+        Disabling may give a performance gain, but may result in problems
+        (crashes, non-termination) if the inputs do contain infinities or NaNs.
+        Default: True
+    seed : {None, int, `numpy.random.Generator`, `numpy.random.RandomState`}, optional
+        Seed for initializing the pseudo-random number generator.
+        If `seed` is None (or `numpy.random`), the `numpy.random.RandomState`
+        singleton is used.
+        If `seed` is an int, a new ``RandomState`` instance is used,
+        seeded with `seed`.
+        If `seed` is already a ``Generator`` or ``RandomState`` instance then
+        that instance is used.
+        The default is None.
+
+    Returns
+    -------
+    centroid : ndarray
+        A 'k' by 'N' array of centroids found at the last iteration of
+        k-means.
+    label : ndarray
+        label[i] is the code or index of the centroid the
+        ith observation is closest to.
+
+    See Also
+    --------
+    kmeans
+
+    References
+    ----------
+    .. [1] D. Arthur and S. Vassilvitskii, "k-means++: the advantages of
+       careful seeding", Proceedings of the Eighteenth Annual ACM-SIAM Symposium
+       on Discrete Algorithms, 2007.
+
+    Examples
+    --------
+    >>> from scipy.cluster.vq import kmeans2
+    >>> import matplotlib.pyplot as plt
+    >>> import numpy as np
+
+    Create z, an array with shape (100, 2) containing a mixture of samples
+    from three multivariate normal distributions.
+
+    >>> rng = np.random.default_rng()
+    >>> a = rng.multivariate_normal([0, 6], [[2, 1], [1, 1.5]], size=45)
+    >>> b = rng.multivariate_normal([2, 0], [[1, -1], [-1, 3]], size=30)
+    >>> c = rng.multivariate_normal([6, 4], [[5, 0], [0, 1.2]], size=25)
+    >>> z = np.concatenate((a, b, c))
+    >>> rng.shuffle(z)
+
+    Compute three clusters.
+
+    >>> centroid, label = kmeans2(z, 3, minit='points')
+    >>> centroid
+    array([[ 2.22274463, -0.61666946],  # may vary
+           [ 0.54069047,  5.86541444],
+           [ 6.73846769,  4.01991898]])
+
+    How many points are in each cluster?
+
+    >>> counts = np.bincount(label)
+    >>> counts
+    array([29, 51, 20])  # may vary
+
+    Plot the clusters.
+
+    >>> w0 = z[label == 0]
+    >>> w1 = z[label == 1]
+    >>> w2 = z[label == 2]
+    >>> plt.plot(w0[:, 0], w0[:, 1], 'o', alpha=0.5, label='cluster 0')
+    >>> plt.plot(w1[:, 0], w1[:, 1], 'd', alpha=0.5, label='cluster 1')
+    >>> plt.plot(w2[:, 0], w2[:, 1], 's', alpha=0.5, label='cluster 2')
+    >>> plt.plot(centroid[:, 0], centroid[:, 1], 'k*', label='centroids')
+    >>> plt.axis('equal')
+    >>> plt.legend(shadow=True)
+    >>> plt.show()
+
+    """
+    if int(iter) < 1:
+        raise ValueError("Invalid iter (%s), "
+                         "must be a positive integer." % iter)
+    try:
+        miss_meth = _valid_miss_meth[missing]
+    except KeyError as e:
+        raise ValueError(f"Unknown missing method {missing!r}") from e
+
+    if isinstance(k, int):
+        xp = array_namespace(data)
+    else:
+        xp = array_namespace(data, k)
+    data = _asarray(data, xp=xp, check_finite=check_finite)
+    code_book = copy(k, xp=xp)
+    if data.ndim == 1:
+        d = 1
+    elif data.ndim == 2:
+        d = data.shape[1]
+    else:
+        raise ValueError("Input of rank > 2 is not supported.")
+
+    if size(data) < 1 or size(code_book) < 1:
+        raise ValueError("Empty input is not supported.")
+
+    # If k is not a single value, it should be compatible with data's shape
+    if minit == 'matrix' or size(code_book) > 1:
+        if data.ndim != code_book.ndim:
+            raise ValueError("k array doesn't match data rank")
+        nc = code_book.shape[0]
+        if data.ndim > 1 and code_book.shape[1] != d:
+            raise ValueError("k array doesn't match data dimension")
+    else:
+        nc = int(code_book)
+
+        if nc < 1:
+            raise ValueError("Cannot ask kmeans2 for %d clusters"
+                             " (k was %s)" % (nc, code_book))
+        elif nc != code_book:
+            warnings.warn("k was not an integer, was converted.", stacklevel=2)
+
+        try:
+            init_meth = _valid_init_meth[minit]
+        except KeyError as e:
+            raise ValueError(f"Unknown init method {minit!r}") from e
+        else:
+            rng = check_random_state(seed)
+            code_book = init_meth(data, code_book, rng, xp)
+
+    data = np.asarray(data)
+    code_book = np.asarray(code_book)
+    for i in range(iter):
+        # Compute the nearest neighbor for each obs using the current code book
+        label = vq(data, code_book, check_finite=check_finite)[0]
+        # Update the code book by computing centroids
+        new_code_book, has_members = _vq.update_cluster_means(data, label, nc)
+        if not has_members.all():
+            miss_meth()
+            # Set the empty clusters to their previous positions
+            new_code_book[~has_members] = code_book[~has_members]
+        code_book = new_code_book
+
+    return xp.asarray(code_book), xp.asarray(label)

parrot/lib/python3.10/site-packages/scipy/fft/__init__.py

@@ -0,0 +1,114 @@
+"""
+==============================================
+Discrete Fourier transforms (:mod:`scipy.fft`)
+==============================================
+
+.. currentmodule:: scipy.fft
+
+Fast Fourier Transforms (FFTs)
+==============================
+
+.. autosummary::
+   :toctree: generated/
+
+   fft - Fast (discrete) Fourier Transform (FFT)
+   ifft - Inverse FFT
+   fft2 - 2-D FFT
+   ifft2 - 2-D inverse FFT
+   fftn - N-D FFT
+   ifftn - N-D inverse FFT
+   rfft - FFT of strictly real-valued sequence
+   irfft - Inverse of rfft
+   rfft2 - 2-D FFT of real sequence
+   irfft2 - Inverse of rfft2
+   rfftn - N-D FFT of real sequence
+   irfftn - Inverse of rfftn
+   hfft - FFT of a Hermitian sequence (real spectrum)
+   ihfft - Inverse of hfft
+   hfft2 - 2-D FFT of a Hermitian sequence
+   ihfft2 - Inverse of hfft2
+   hfftn - N-D FFT of a Hermitian sequence
+   ihfftn - Inverse of hfftn
+
+Discrete Sin and Cosine Transforms (DST and DCT)
+================================================
+
+.. autosummary::
+   :toctree: generated/
+
+   dct - Discrete cosine transform
+   idct - Inverse discrete cosine transform
+   dctn - N-D Discrete cosine transform
+   idctn - N-D Inverse discrete cosine transform
+   dst - Discrete sine transform
+   idst - Inverse discrete sine transform
+   dstn - N-D Discrete sine transform
+   idstn - N-D Inverse discrete sine transform
+
+Fast Hankel Transforms
+======================
+
+.. autosummary::
+   :toctree: generated/
+
+   fht - Fast Hankel transform
+   ifht - Inverse of fht
+
+Helper functions
+================
+
+.. autosummary::
+   :toctree: generated/
+
+   fftshift - Shift the zero-frequency component to the center of the spectrum
+   ifftshift - The inverse of `fftshift`
+   fftfreq - Return the Discrete Fourier Transform sample frequencies
+   rfftfreq - DFT sample frequencies (for usage with rfft, irfft)
+   fhtoffset - Compute an optimal offset for the Fast Hankel Transform
+   next_fast_len - Find the optimal length to zero-pad an FFT for speed
+   prev_fast_len - Find the maximum slice length that results in a fast FFT
+   set_workers - Context manager to set default number of workers
+   get_workers - Get the current default number of workers
+
+Backend control
+===============
+
+.. autosummary::
+   :toctree: generated/
+
+   set_backend - Context manager to set the backend within a fixed scope
+   skip_backend - Context manager to skip a backend within a fixed scope
+   set_global_backend - Sets the global fft backend
+   register_backend - Register a backend for permanent use
+
+"""
+
+from ._basic import (
+    fft, ifft, fft2, ifft2, fftn, ifftn,
+    rfft, irfft, rfft2, irfft2, rfftn, irfftn,
+    hfft, ihfft, hfft2, ihfft2, hfftn, ihfftn)
+from ._realtransforms import dct, idct, dst, idst, dctn, idctn, dstn, idstn
+from ._fftlog import fht, ifht, fhtoffset
+from ._helper import (
+    next_fast_len, prev_fast_len, fftfreq,
+    rfftfreq, fftshift, ifftshift)
+from ._backend import (set_backend, skip_backend, set_global_backend,
+                       register_backend)
+from ._pocketfft.helper import set_workers, get_workers
+
+__all__ = [
+    'fft', 'ifft', 'fft2', 'ifft2', 'fftn', 'ifftn',
+    'rfft', 'irfft', 'rfft2', 'irfft2', 'rfftn', 'irfftn',
+    'hfft', 'ihfft', 'hfft2', 'ihfft2', 'hfftn', 'ihfftn',
+    'fftfreq', 'rfftfreq', 'fftshift', 'ifftshift',
+    'next_fast_len', 'prev_fast_len',
+    'dct', 'idct', 'dst', 'idst', 'dctn', 'idctn', 'dstn', 'idstn',
+    'fht', 'ifht',
+    'fhtoffset',
+    'set_backend', 'skip_backend', 'set_global_backend', 'register_backend',
+    'get_workers', 'set_workers']
+
+
+from scipy._lib._testutils import PytestTester
+test = PytestTester(__name__)
+del PytestTester

parrot/lib/python3.10/site-packages/scipy/fft/_backend.py

@@ -0,0 +1,196 @@
+import scipy._lib.uarray as ua
+from . import _basic_backend
+from . import _realtransforms_backend
+from . import _fftlog_backend
+
+
+class _ScipyBackend:
+    """The default backend for fft calculations
+
+    Notes
+    -----
+    We use the domain ``numpy.scipy`` rather than ``scipy`` because ``uarray``
+    treats the domain as a hierarchy. This means the user can install a single
+    backend for ``numpy`` and have it implement ``numpy.scipy.fft`` as well.
+    """
+    __ua_domain__ = "numpy.scipy.fft"
+
+    @staticmethod
+    def __ua_function__(method, args, kwargs):
+
+        fn = getattr(_basic_backend, method.__name__, None)
+        if fn is None:
+            fn = getattr(_realtransforms_backend, method.__name__, None)
+        if fn is None:
+            fn = getattr(_fftlog_backend, method.__name__, None)
+        if fn is None:
+            return NotImplemented
+        return fn(*args, **kwargs)
+
+
+_named_backends = {
+    'scipy': _ScipyBackend,
+}
+
+
+def _backend_from_arg(backend):
+    """Maps strings to known backends and validates the backend"""
+
+    if isinstance(backend, str):
+        try:
+            backend = _named_backends[backend]
+        except KeyError as e:
+            raise ValueError(f'Unknown backend {backend}') from e
+
+    if backend.__ua_domain__ != 'numpy.scipy.fft':
+        raise ValueError('Backend does not implement "numpy.scipy.fft"')
+
+    return backend
+
+
+def set_global_backend(backend, coerce=False, only=False, try_last=False):
+    """Sets the global fft backend
+
+    This utility method replaces the default backend for permanent use. It
+    will be tried in the list of backends automatically, unless the
+    ``only`` flag is set on a backend. This will be the first tried
+    backend outside the :obj:`set_backend` context manager.
+
+    Parameters
+    ----------
+    backend : {object, 'scipy'}
+        The backend to use.
+        Can either be a ``str`` containing the name of a known backend
+        {'scipy'} or an object that implements the uarray protocol.
+    coerce : bool
+        Whether to coerce input types when trying this backend.
+    only : bool
+        If ``True``, no more backends will be tried if this fails.
+        Implied by ``coerce=True``.
+    try_last : bool
+        If ``True``, the global backend is tried after registered backends.
+
+    Raises
+    ------
+    ValueError: If the backend does not implement ``numpy.scipy.fft``.
+
+    Notes
+    -----
+    This will overwrite the previously set global backend, which, by default, is
+    the SciPy implementation.
+
+    Examples
+    --------
+    We can set the global fft backend:
+
+    >>> from scipy.fft import fft, set_global_backend
+    >>> set_global_backend("scipy")  # Sets global backend (default is "scipy").
+    >>> fft([1])  # Calls the global backend
+    array([1.+0.j])
+    """
+    backend = _backend_from_arg(backend)
+    ua.set_global_backend(backend, coerce=coerce, only=only, try_last=try_last)
+
+
+def register_backend(backend):
+    """
+    Register a backend for permanent use.
+
+    Registered backends have the lowest priority and will be tried after the
+    global backend.
+
+    Parameters
+    ----------
+    backend : {object, 'scipy'}
+        The backend to use.
+        Can either be a ``str`` containing the name of a known backend
+        {'scipy'} or an object that implements the uarray protocol.
+
+    Raises
+    ------
+    ValueError: If the backend does not implement ``numpy.scipy.fft``.
+
+    Examples
+    --------
+    We can register a new fft backend:
+
+    >>> from scipy.fft import fft, register_backend, set_global_backend
+    >>> class NoopBackend:  # Define an invalid Backend
+    ...     __ua_domain__ = "numpy.scipy.fft"
+    ...     def __ua_function__(self, func, args, kwargs):
+    ...          return NotImplemented
+    >>> set_global_backend(NoopBackend())  # Set the invalid backend as global
+    >>> register_backend("scipy")  # Register a new backend
+    # The registered backend is called because
+    # the global backend returns `NotImplemented`
+    >>> fft([1])
+    array([1.+0.j])
+    >>> set_global_backend("scipy")  # Restore global backend to default
+
+    """
+    backend = _backend_from_arg(backend)
+    ua.register_backend(backend)
+
+
+def set_backend(backend, coerce=False, only=False):
+    """Context manager to set the backend within a fixed scope.
+
+    Upon entering the ``with`` statement, the given backend will be added to
+    the list of available backends with the highest priority. Upon exit, the
+    backend is reset to the state before entering the scope.
+
+    Parameters
+    ----------
+    backend : {object, 'scipy'}
+        The backend to use.
+        Can either be a ``str`` containing the name of a known backend
+        {'scipy'} or an object that implements the uarray protocol.
+    coerce : bool, optional
+        Whether to allow expensive conversions for the ``x`` parameter. e.g.,
+        copying a NumPy array to the GPU for a CuPy backend. Implies ``only``.
+    only : bool, optional
+        If only is ``True`` and this backend returns ``NotImplemented``, then a
+        BackendNotImplemented error will be raised immediately. Ignoring any
+        lower priority backends.
+
+    Examples
+    --------
+    >>> import scipy.fft as fft
+    >>> with fft.set_backend('scipy', only=True):
+    ...     fft.fft([1])  # Always calls the scipy implementation
+    array([1.+0.j])
+    """
+    backend = _backend_from_arg(backend)
+    return ua.set_backend(backend, coerce=coerce, only=only)
+
+
+def skip_backend(backend):
+    """Context manager to skip a backend within a fixed scope.
+
+    Within the context of a ``with`` statement, the given backend will not be
+    called. This covers backends registered both locally and globally. Upon
+    exit, the backend will again be considered.
+
+    Parameters
+    ----------
+    backend : {object, 'scipy'}
+        The backend to skip.
+        Can either be a ``str`` containing the name of a known backend
+        {'scipy'} or an object that implements the uarray protocol.
+
+    Examples
+    --------
+    >>> import scipy.fft as fft
+    >>> fft.fft([1])  # Calls default SciPy backend
+    array([1.+0.j])
+    >>> with fft.skip_backend('scipy'):  # We explicitly skip the SciPy backend
+    ...     fft.fft([1])                 # leaving no implementation available
+    Traceback (most recent call last):
+        ...
+    BackendNotImplementedError: No selected backends had an implementation ...
+    """
+    backend = _backend_from_arg(backend)
+    return ua.skip_backend(backend)
+
+
+set_global_backend('scipy', try_last=True)

parrot/lib/python3.10/site-packages/scipy/fft/_basic.py

@@ -0,0 +1,1630 @@
+from scipy._lib.uarray import generate_multimethod, Dispatchable
+import numpy as np
+
+
+def _x_replacer(args, kwargs, dispatchables):
+    """
+    uarray argument replacer to replace the transform input array (``x``)
+    """
+    if len(args) > 0:
+        return (dispatchables[0],) + args[1:], kwargs
+    kw = kwargs.copy()
+    kw['x'] = dispatchables[0]
+    return args, kw
+
+
+def _dispatch(func):
+    """
+    Function annotation that creates a uarray multimethod from the function
+    """
+    return generate_multimethod(func, _x_replacer, domain="numpy.scipy.fft")
+
+
+@_dispatch
+def fft(x, n=None, axis=-1, norm=None, overwrite_x=False, workers=None, *,
+        plan=None):
+    """
+    Compute the 1-D discrete Fourier Transform.
+
+    This function computes the 1-D *n*-point discrete Fourier
+    Transform (DFT) with the efficient Fast Fourier Transform (FFT)
+    algorithm [1]_.
+
+    Parameters
+    ----------
+    x : array_like
+        Input array, can be complex.
+    n : int, optional
+        Length of the transformed axis of the output.
+        If `n` is smaller than the length of the input, the input is cropped.
+        If it is larger, the input is padded with zeros. If `n` is not given,
+        the length of the input along the axis specified by `axis` is used.
+    axis : int, optional
+        Axis over which to compute the FFT. If not given, the last axis is
+        used.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode. Default is "backward", meaning no normalization on
+        the forward transforms and scaling by ``1/n`` on the `ifft`.
+        "forward" instead applies the ``1/n`` factor on the forward transform.
+        For ``norm="ortho"``, both directions are scaled by ``1/sqrt(n)``.
+
+        .. versionadded:: 1.6.0
+           ``norm={"forward", "backward"}`` options were added
+
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See the notes below for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``. See below for more
+        details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : complex ndarray
+        The truncated or zero-padded input, transformed along the axis
+        indicated by `axis`, or the last one if `axis` is not specified.
+
+    Raises
+    ------
+    IndexError
+        if `axes` is larger than the last axis of `x`.
+
+    See Also
+    --------
+    ifft : The inverse of `fft`.
+    fft2 : The 2-D FFT.
+    fftn : The N-D FFT.
+    rfftn : The N-D FFT of real input.
+    fftfreq : Frequency bins for given FFT parameters.
+    next_fast_len : Size to pad input to for most efficient transforms
+
+    Notes
+    -----
+    FFT (Fast Fourier Transform) refers to a way the discrete Fourier Transform
+    (DFT) can be calculated efficiently, by using symmetries in the calculated
+    terms. The symmetry is highest when `n` is a power of 2, and the transform
+    is therefore most efficient for these sizes. For poorly factorizable sizes,
+    `scipy.fft` uses Bluestein's algorithm [2]_ and so is never worse than
+    O(`n` log `n`). Further performance improvements may be seen by zero-padding
+    the input using `next_fast_len`.
+
+    If ``x`` is a 1d array, then the `fft` is equivalent to ::
+
+        y[k] = np.sum(x * np.exp(-2j * np.pi * k * np.arange(n)/n))
+
+    The frequency term ``f=k/n`` is found at ``y[k]``. At ``y[n/2]`` we reach
+    the Nyquist frequency and wrap around to the negative-frequency terms. So,
+    for an 8-point transform, the frequencies of the result are
+    [0, 1, 2, 3, -4, -3, -2, -1]. To rearrange the fft output so that the
+    zero-frequency component is centered, like [-4, -3, -2, -1, 0, 1, 2, 3],
+    use `fftshift`.
+
+    Transforms can be done in single, double, or extended precision (long
+    double) floating point. Half precision inputs will be converted to single
+    precision and non-floating-point inputs will be converted to double
+    precision.
+
+    If the data type of ``x`` is real, a "real FFT" algorithm is automatically
+    used, which roughly halves the computation time. To increase efficiency
+    a little further, use `rfft`, which does the same calculation, but only
+    outputs half of the symmetrical spectrum. If the data are both real and
+    symmetrical, the `dct` can again double the efficiency, by generating
+    half of the spectrum from half of the signal.
+
+    When ``overwrite_x=True`` is specified, the memory referenced by ``x`` may
+    be used by the implementation in any way. This may include reusing the
+    memory for the result, but this is in no way guaranteed. You should not
+    rely on the contents of ``x`` after the transform as this may change in
+    future without warning.
+
+    The ``workers`` argument specifies the maximum number of parallel jobs to
+    split the FFT computation into. This will execute independent 1-D
+    FFTs within ``x``. So, ``x`` must be at least 2-D and the
+    non-transformed axes must be large enough to split into chunks. If ``x`` is
+    too small, fewer jobs may be used than requested.
+
+    References
+    ----------
+    .. [1] Cooley, James W., and John W. Tukey, 1965, "An algorithm for the
+           machine calculation of complex Fourier series," *Math. Comput.*
+           19: 297-301.
+    .. [2] Bluestein, L., 1970, "A linear filtering approach to the
+           computation of discrete Fourier transform". *IEEE Transactions on
+           Audio and Electroacoustics.* 18 (4): 451-455.
+
+    Examples
+    --------
+    >>> import scipy.fft
+    >>> import numpy as np
+    >>> scipy.fft.fft(np.exp(2j * np.pi * np.arange(8) / 8))
+    array([-2.33486982e-16+1.14423775e-17j,  8.00000000e+00-1.25557246e-15j,
+            2.33486982e-16+2.33486982e-16j,  0.00000000e+00+1.22464680e-16j,
+           -1.14423775e-17+2.33486982e-16j,  0.00000000e+00+5.20784380e-16j,
+            1.14423775e-17+1.14423775e-17j,  0.00000000e+00+1.22464680e-16j])
+
+    In this example, real input has an FFT which is Hermitian, i.e., symmetric
+    in the real part and anti-symmetric in the imaginary part:
+
+    >>> from scipy.fft import fft, fftfreq, fftshift
+    >>> import matplotlib.pyplot as plt
+    >>> t = np.arange(256)
+    >>> sp = fftshift(fft(np.sin(t)))
+    >>> freq = fftshift(fftfreq(t.shape[-1]))
+    >>> plt.plot(freq, sp.real, freq, sp.imag)
+    [<matplotlib.lines.Line2D object at 0x...>,
+     <matplotlib.lines.Line2D object at 0x...>]
+    >>> plt.show()
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def ifft(x, n=None, axis=-1, norm=None, overwrite_x=False, workers=None, *,
+         plan=None):
+    """
+    Compute the 1-D inverse discrete Fourier Transform.
+
+    This function computes the inverse of the 1-D *n*-point
+    discrete Fourier transform computed by `fft`.  In other words,
+    ``ifft(fft(x)) == x`` to within numerical accuracy.
+
+    The input should be ordered in the same way as is returned by `fft`,
+    i.e.,
+
+    * ``x[0]`` should contain the zero frequency term,
+    * ``x[1:n//2]`` should contain the positive-frequency terms,
+    * ``x[n//2 + 1:]`` should contain the negative-frequency terms, in
+      increasing order starting from the most negative frequency.
+
+    For an even number of input points, ``x[n//2]`` represents the sum of
+    the values at the positive and negative Nyquist frequencies, as the two
+    are aliased together. See `fft` for details.
+
+    Parameters
+    ----------
+    x : array_like
+        Input array, can be complex.
+    n : int, optional
+        Length of the transformed axis of the output.
+        If `n` is smaller than the length of the input, the input is cropped.
+        If it is larger, the input is padded with zeros. If `n` is not given,
+        the length of the input along the axis specified by `axis` is used.
+        See notes about padding issues.
+    axis : int, optional
+        Axis over which to compute the inverse DFT. If not given, the last
+        axis is used.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see `fft`). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See :func:`fft` for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : complex ndarray
+        The truncated or zero-padded input, transformed along the axis
+        indicated by `axis`, or the last one if `axis` is not specified.
+
+    Raises
+    ------
+    IndexError
+        If `axes` is larger than the last axis of `x`.
+
+    See Also
+    --------
+    fft : The 1-D (forward) FFT, of which `ifft` is the inverse.
+    ifft2 : The 2-D inverse FFT.
+    ifftn : The N-D inverse FFT.
+
+    Notes
+    -----
+    If the input parameter `n` is larger than the size of the input, the input
+    is padded by appending zeros at the end. Even though this is the common
+    approach, it might lead to surprising results. If a different padding is
+    desired, it must be performed before calling `ifft`.
+
+    If ``x`` is a 1-D array, then the `ifft` is equivalent to ::
+
+        y[k] = np.sum(x * np.exp(2j * np.pi * k * np.arange(n)/n)) / len(x)
+
+    As with `fft`, `ifft` has support for all floating point types and is
+    optimized for real input.
+
+    Examples
+    --------
+    >>> import scipy.fft
+    >>> import numpy as np
+    >>> scipy.fft.ifft([0, 4, 0, 0])
+    array([ 1.+0.j,  0.+1.j, -1.+0.j,  0.-1.j]) # may vary
+
+    Create and plot a band-limited signal with random phases:
+
+    >>> import matplotlib.pyplot as plt
+    >>> rng = np.random.default_rng()
+    >>> t = np.arange(400)
+    >>> n = np.zeros((400,), dtype=complex)
+    >>> n[40:60] = np.exp(1j*rng.uniform(0, 2*np.pi, (20,)))
+    >>> s = scipy.fft.ifft(n)
+    >>> plt.plot(t, s.real, 'b-', t, s.imag, 'r--')
+    [<matplotlib.lines.Line2D object at ...>, <matplotlib.lines.Line2D object at ...>]
+    >>> plt.legend(('real', 'imaginary'))
+    <matplotlib.legend.Legend object at ...>
+    >>> plt.show()
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def rfft(x, n=None, axis=-1, norm=None, overwrite_x=False, workers=None, *,
+         plan=None):
+    """
+    Compute the 1-D discrete Fourier Transform for real input.
+
+    This function computes the 1-D *n*-point discrete Fourier
+    Transform (DFT) of a real-valued array by means of an efficient algorithm
+    called the Fast Fourier Transform (FFT).
+
+    Parameters
+    ----------
+    x : array_like
+        Input array
+    n : int, optional
+        Number of points along transformation axis in the input to use.
+        If `n` is smaller than the length of the input, the input is cropped.
+        If it is larger, the input is padded with zeros. If `n` is not given,
+        the length of the input along the axis specified by `axis` is used.
+    axis : int, optional
+        Axis over which to compute the FFT. If not given, the last axis is
+        used.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see `fft`). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See :func:`fft` for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : complex ndarray
+        The truncated or zero-padded input, transformed along the axis
+        indicated by `axis`, or the last one if `axis` is not specified.
+        If `n` is even, the length of the transformed axis is ``(n/2)+1``.
+        If `n` is odd, the length is ``(n+1)/2``.
+
+    Raises
+    ------
+    IndexError
+        If `axis` is larger than the last axis of `a`.
+
+    See Also
+    --------
+    irfft : The inverse of `rfft`.
+    fft : The 1-D FFT of general (complex) input.
+    fftn : The N-D FFT.
+    rfft2 : The 2-D FFT of real input.
+    rfftn : The N-D FFT of real input.
+
+    Notes
+    -----
+    When the DFT is computed for purely real input, the output is
+    Hermitian-symmetric, i.e., the negative frequency terms are just the complex
+    conjugates of the corresponding positive-frequency terms, and the
+    negative-frequency terms are therefore redundant. This function does not
+    compute the negative frequency terms, and the length of the transformed
+    axis of the output is therefore ``n//2 + 1``.
+
+    When ``X = rfft(x)`` and fs is the sampling frequency, ``X[0]`` contains
+    the zero-frequency term 0*fs, which is real due to Hermitian symmetry.
+
+    If `n` is even, ``A[-1]`` contains the term representing both positive
+    and negative Nyquist frequency (+fs/2 and -fs/2), and must also be purely
+    real. If `n` is odd, there is no term at fs/2; ``A[-1]`` contains
+    the largest positive frequency (fs/2*(n-1)/n), and is complex in the
+    general case.
+
+    If the input `a` contains an imaginary part, it is silently discarded.
+
+    Examples
+    --------
+    >>> import scipy.fft
+    >>> scipy.fft.fft([0, 1, 0, 0])
+    array([ 1.+0.j,  0.-1.j, -1.+0.j,  0.+1.j]) # may vary
+    >>> scipy.fft.rfft([0, 1, 0, 0])
+    array([ 1.+0.j,  0.-1.j, -1.+0.j]) # may vary
+
+    Notice how the final element of the `fft` output is the complex conjugate
+    of the second element, for real input. For `rfft`, this symmetry is
+    exploited to compute only the non-negative frequency terms.
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def irfft(x, n=None, axis=-1, norm=None, overwrite_x=False, workers=None, *,
+          plan=None):
+    """
+    Computes the inverse of `rfft`.
+
+    This function computes the inverse of the 1-D *n*-point
+    discrete Fourier Transform of real input computed by `rfft`.
+    In other words, ``irfft(rfft(x), len(x)) == x`` to within numerical
+    accuracy. (See Notes below for why ``len(a)`` is necessary here.)
+
+    The input is expected to be in the form returned by `rfft`, i.e., the
+    real zero-frequency term followed by the complex positive frequency terms
+    in order of increasing frequency. Since the discrete Fourier Transform of
+    real input is Hermitian-symmetric, the negative frequency terms are taken
+    to be the complex conjugates of the corresponding positive frequency terms.
+
+    Parameters
+    ----------
+    x : array_like
+        The input array.
+    n : int, optional
+        Length of the transformed axis of the output.
+        For `n` output points, ``n//2+1`` input points are necessary. If the
+        input is longer than this, it is cropped. If it is shorter than this,
+        it is padded with zeros. If `n` is not given, it is taken to be
+        ``2*(m-1)``, where ``m`` is the length of the input along the axis
+        specified by `axis`.
+    axis : int, optional
+        Axis over which to compute the inverse FFT. If not given, the last
+        axis is used.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see `fft`). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See :func:`fft` for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : ndarray
+        The truncated or zero-padded input, transformed along the axis
+        indicated by `axis`, or the last one if `axis` is not specified.
+        The length of the transformed axis is `n`, or, if `n` is not given,
+        ``2*(m-1)`` where ``m`` is the length of the transformed axis of the
+        input. To get an odd number of output points, `n` must be specified.
+
+    Raises
+    ------
+    IndexError
+        If `axis` is larger than the last axis of `x`.
+
+    See Also
+    --------
+    rfft : The 1-D FFT of real input, of which `irfft` is inverse.
+    fft : The 1-D FFT.
+    irfft2 : The inverse of the 2-D FFT of real input.
+    irfftn : The inverse of the N-D FFT of real input.
+
+    Notes
+    -----
+    Returns the real valued `n`-point inverse discrete Fourier transform
+    of `x`, where `x` contains the non-negative frequency terms of a
+    Hermitian-symmetric sequence. `n` is the length of the result, not the
+    input.
+
+    If you specify an `n` such that `a` must be zero-padded or truncated, the
+    extra/removed values will be added/removed at high frequencies. One can
+    thus resample a series to `m` points via Fourier interpolation by:
+    ``a_resamp = irfft(rfft(a), m)``.
+
+    The default value of `n` assumes an even output length. By the Hermitian
+    symmetry, the last imaginary component must be 0 and so is ignored. To
+    avoid losing information, the correct length of the real input *must* be
+    given.
+
+    Examples
+    --------
+    >>> import scipy.fft
+    >>> scipy.fft.ifft([1, -1j, -1, 1j])
+    array([0.+0.j,  1.+0.j,  0.+0.j,  0.+0.j]) # may vary
+    >>> scipy.fft.irfft([1, -1j, -1])
+    array([0.,  1.,  0.,  0.])
+
+    Notice how the last term in the input to the ordinary `ifft` is the
+    complex conjugate of the second term, and the output has zero imaginary
+    part everywhere. When calling `irfft`, the negative frequencies are not
+    specified, and the output array is purely real.
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def hfft(x, n=None, axis=-1, norm=None, overwrite_x=False, workers=None, *,
+         plan=None):
+    """
+    Compute the FFT of a signal that has Hermitian symmetry, i.e., a real
+    spectrum.
+
+    Parameters
+    ----------
+    x : array_like
+        The input array.
+    n : int, optional
+        Length of the transformed axis of the output. For `n` output
+        points, ``n//2 + 1`` input points are necessary. If the input is
+        longer than this, it is cropped. If it is shorter than this, it is
+        padded with zeros. If `n` is not given, it is taken to be ``2*(m-1)``,
+        where ``m`` is the length of the input along the axis specified by
+        `axis`.
+    axis : int, optional
+        Axis over which to compute the FFT. If not given, the last
+        axis is used.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see `fft`). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See `fft` for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : ndarray
+        The truncated or zero-padded input, transformed along the axis
+        indicated by `axis`, or the last one if `axis` is not specified.
+        The length of the transformed axis is `n`, or, if `n` is not given,
+        ``2*m - 2``, where ``m`` is the length of the transformed axis of
+        the input. To get an odd number of output points, `n` must be
+        specified, for instance, as ``2*m - 1`` in the typical case,
+
+    Raises
+    ------
+    IndexError
+        If `axis` is larger than the last axis of `a`.
+
+    See Also
+    --------
+    rfft : Compute the 1-D FFT for real input.
+    ihfft : The inverse of `hfft`.
+    hfftn : Compute the N-D FFT of a Hermitian signal.
+
+    Notes
+    -----
+    `hfft`/`ihfft` are a pair analogous to `rfft`/`irfft`, but for the
+    opposite case: here the signal has Hermitian symmetry in the time
+    domain and is real in the frequency domain. So, here, it's `hfft`, for
+    which you must supply the length of the result if it is to be odd.
+    * even: ``ihfft(hfft(a, 2*len(a) - 2) == a``, within roundoff error,
+    * odd: ``ihfft(hfft(a, 2*len(a) - 1) == a``, within roundoff error.
+
+    Examples
+    --------
+    >>> from scipy.fft import fft, hfft
+    >>> import numpy as np
+    >>> a = 2 * np.pi * np.arange(10) / 10
+    >>> signal = np.cos(a) + 3j * np.sin(3 * a)
+    >>> fft(signal).round(10)
+    array([ -0.+0.j,   5.+0.j,  -0.+0.j,  15.-0.j,   0.+0.j,   0.+0.j,
+            -0.+0.j, -15.-0.j,   0.+0.j,   5.+0.j])
+    >>> hfft(signal[:6]).round(10) # Input first half of signal
+    array([  0.,   5.,   0.,  15.,  -0.,   0.,   0., -15.,  -0.,   5.])
+    >>> hfft(signal, 10)  # Input entire signal and truncate
+    array([  0.,   5.,   0.,  15.,  -0.,   0.,   0., -15.,  -0.,   5.])
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def ihfft(x, n=None, axis=-1, norm=None, overwrite_x=False, workers=None, *,
+          plan=None):
+    """
+    Compute the inverse FFT of a signal that has Hermitian symmetry.
+
+    Parameters
+    ----------
+    x : array_like
+        Input array.
+    n : int, optional
+        Length of the inverse FFT, the number of points along
+        transformation axis in the input to use.  If `n` is smaller than
+        the length of the input, the input is cropped. If it is larger,
+        the input is padded with zeros. If `n` is not given, the length of
+        the input along the axis specified by `axis` is used.
+    axis : int, optional
+        Axis over which to compute the inverse FFT. If not given, the last
+        axis is used.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see `fft`). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See `fft` for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : complex ndarray
+        The truncated or zero-padded input, transformed along the axis
+        indicated by `axis`, or the last one if `axis` is not specified.
+        The length of the transformed axis is ``n//2 + 1``.
+
+    See Also
+    --------
+    hfft, irfft
+
+    Notes
+    -----
+    `hfft`/`ihfft` are a pair analogous to `rfft`/`irfft`, but for the
+    opposite case: here, the signal has Hermitian symmetry in the time
+    domain and is real in the frequency domain. So, here, it's `hfft`, for
+    which you must supply the length of the result if it is to be odd:
+    * even: ``ihfft(hfft(a, 2*len(a) - 2) == a``, within roundoff error,
+    * odd: ``ihfft(hfft(a, 2*len(a) - 1) == a``, within roundoff error.
+
+    Examples
+    --------
+    >>> from scipy.fft import ifft, ihfft
+    >>> import numpy as np
+    >>> spectrum = np.array([ 15, -4, 0, -1, 0, -4])
+    >>> ifft(spectrum)
+    array([1.+0.j,  2.+0.j,  3.+0.j,  4.+0.j,  3.+0.j,  2.+0.j]) # may vary
+    >>> ihfft(spectrum)
+    array([ 1.-0.j,  2.-0.j,  3.-0.j,  4.-0.j]) # may vary
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def fftn(x, s=None, axes=None, norm=None, overwrite_x=False, workers=None, *,
+         plan=None):
+    """
+    Compute the N-D discrete Fourier Transform.
+
+    This function computes the N-D discrete Fourier Transform over
+    any number of axes in an M-D array by means of the Fast Fourier
+    Transform (FFT).
+
+    Parameters
+    ----------
+    x : array_like
+        Input array, can be complex.
+    s : sequence of ints, optional
+        Shape (length of each transformed axis) of the output
+        (``s[0]`` refers to axis 0, ``s[1]`` to axis 1, etc.).
+        This corresponds to ``n`` for ``fft(x, n)``.
+        Along any axis, if the given shape is smaller than that of the input,
+        the input is cropped. If it is larger, the input is padded with zeros.
+        if `s` is not given, the shape of the input along the axes specified
+        by `axes` is used.
+    axes : sequence of ints, optional
+        Axes over which to compute the FFT. If not given, the last ``len(s)``
+        axes are used, or all axes if `s` is also not specified.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see `fft`). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See :func:`fft` for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : complex ndarray
+        The truncated or zero-padded input, transformed along the axes
+        indicated by `axes`, or by a combination of `s` and `x`,
+        as explained in the parameters section above.
+
+    Raises
+    ------
+    ValueError
+        If `s` and `axes` have different length.
+    IndexError
+        If an element of `axes` is larger than the number of axes of `x`.
+
+    See Also
+    --------
+    ifftn : The inverse of `fftn`, the inverse N-D FFT.
+    fft : The 1-D FFT, with definitions and conventions used.
+    rfftn : The N-D FFT of real input.
+    fft2 : The 2-D FFT.
+    fftshift : Shifts zero-frequency terms to centre of array.
+
+    Notes
+    -----
+    The output, analogously to `fft`, contains the term for zero frequency in
+    the low-order corner of all axes, the positive frequency terms in the
+    first half of all axes, the term for the Nyquist frequency in the middle
+    of all axes and the negative frequency terms in the second half of all
+    axes, in order of decreasingly negative frequency.
+
+    Examples
+    --------
+    >>> import scipy.fft
+    >>> import numpy as np
+    >>> x = np.mgrid[:3, :3, :3][0]
+    >>> scipy.fft.fftn(x, axes=(1, 2))
+    array([[[ 0.+0.j,   0.+0.j,   0.+0.j], # may vary
+            [ 0.+0.j,   0.+0.j,   0.+0.j],
+            [ 0.+0.j,   0.+0.j,   0.+0.j]],
+           [[ 9.+0.j,   0.+0.j,   0.+0.j],
+            [ 0.+0.j,   0.+0.j,   0.+0.j],
+            [ 0.+0.j,   0.+0.j,   0.+0.j]],
+           [[18.+0.j,   0.+0.j,   0.+0.j],
+            [ 0.+0.j,   0.+0.j,   0.+0.j],
+            [ 0.+0.j,   0.+0.j,   0.+0.j]]])
+    >>> scipy.fft.fftn(x, (2, 2), axes=(0, 1))
+    array([[[ 2.+0.j,  2.+0.j,  2.+0.j], # may vary
+            [ 0.+0.j,  0.+0.j,  0.+0.j]],
+           [[-2.+0.j, -2.+0.j, -2.+0.j],
+            [ 0.+0.j,  0.+0.j,  0.+0.j]]])
+
+    >>> import matplotlib.pyplot as plt
+    >>> rng = np.random.default_rng()
+    >>> [X, Y] = np.meshgrid(2 * np.pi * np.arange(200) / 12,
+    ...                      2 * np.pi * np.arange(200) / 34)
+    >>> S = np.sin(X) + np.cos(Y) + rng.uniform(0, 1, X.shape)
+    >>> FS = scipy.fft.fftn(S)
+    >>> plt.imshow(np.log(np.abs(scipy.fft.fftshift(FS))**2))
+    <matplotlib.image.AxesImage object at 0x...>
+    >>> plt.show()
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def ifftn(x, s=None, axes=None, norm=None, overwrite_x=False, workers=None, *,
+          plan=None):
+    """
+    Compute the N-D inverse discrete Fourier Transform.
+
+    This function computes the inverse of the N-D discrete
+    Fourier Transform over any number of axes in an M-D array by
+    means of the Fast Fourier Transform (FFT).  In other words,
+    ``ifftn(fftn(x)) == x`` to within numerical accuracy.
+
+    The input, analogously to `ifft`, should be ordered in the same way as is
+    returned by `fftn`, i.e., it should have the term for zero frequency
+    in all axes in the low-order corner, the positive frequency terms in the
+    first half of all axes, the term for the Nyquist frequency in the middle
+    of all axes and the negative frequency terms in the second half of all
+    axes, in order of decreasingly negative frequency.
+
+    Parameters
+    ----------
+    x : array_like
+        Input array, can be complex.
+    s : sequence of ints, optional
+        Shape (length of each transformed axis) of the output
+        (``s[0]`` refers to axis 0, ``s[1]`` to axis 1, etc.).
+        This corresponds to ``n`` for ``ifft(x, n)``.
+        Along any axis, if the given shape is smaller than that of the input,
+        the input is cropped. If it is larger, the input is padded with zeros.
+        if `s` is not given, the shape of the input along the axes specified
+        by `axes` is used. See notes for issue on `ifft` zero padding.
+    axes : sequence of ints, optional
+        Axes over which to compute the IFFT.  If not given, the last ``len(s)``
+        axes are used, or all axes if `s` is also not specified.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see `fft`). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See :func:`fft` for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : complex ndarray
+        The truncated or zero-padded input, transformed along the axes
+        indicated by `axes`, or by a combination of `s` or `x`,
+        as explained in the parameters section above.
+
+    Raises
+    ------
+    ValueError
+        If `s` and `axes` have different length.
+    IndexError
+        If an element of `axes` is larger than the number of axes of `x`.
+
+    See Also
+    --------
+    fftn : The forward N-D FFT, of which `ifftn` is the inverse.
+    ifft : The 1-D inverse FFT.
+    ifft2 : The 2-D inverse FFT.
+    ifftshift : Undoes `fftshift`, shifts zero-frequency terms to beginning
+        of array.
+
+    Notes
+    -----
+    Zero-padding, analogously with `ifft`, is performed by appending zeros to
+    the input along the specified dimension. Although this is the common
+    approach, it might lead to surprising results. If another form of zero
+    padding is desired, it must be performed before `ifftn` is called.
+
+    Examples
+    --------
+    >>> import scipy.fft
+    >>> import numpy as np
+    >>> x = np.eye(4)
+    >>> scipy.fft.ifftn(scipy.fft.fftn(x, axes=(0,)), axes=(1,))
+    array([[1.+0.j,  0.+0.j,  0.+0.j,  0.+0.j], # may vary
+           [0.+0.j,  1.+0.j,  0.+0.j,  0.+0.j],
+           [0.+0.j,  0.+0.j,  1.+0.j,  0.+0.j],
+           [0.+0.j,  0.+0.j,  0.+0.j,  1.+0.j]])
+
+
+    Create and plot an image with band-limited frequency content:
+
+    >>> import matplotlib.pyplot as plt
+    >>> rng = np.random.default_rng()
+    >>> n = np.zeros((200,200), dtype=complex)
+    >>> n[60:80, 20:40] = np.exp(1j*rng.uniform(0, 2*np.pi, (20, 20)))
+    >>> im = scipy.fft.ifftn(n).real
+    >>> plt.imshow(im)
+    <matplotlib.image.AxesImage object at 0x...>
+    >>> plt.show()
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def fft2(x, s=None, axes=(-2, -1), norm=None, overwrite_x=False, workers=None, *,
+         plan=None):
+    """
+    Compute the 2-D discrete Fourier Transform
+
+    This function computes the N-D discrete Fourier Transform
+    over any axes in an M-D array by means of the
+    Fast Fourier Transform (FFT). By default, the transform is computed over
+    the last two axes of the input array, i.e., a 2-dimensional FFT.
+
+    Parameters
+    ----------
+    x : array_like
+        Input array, can be complex
+    s : sequence of ints, optional
+        Shape (length of each transformed axis) of the output
+        (``s[0]`` refers to axis 0, ``s[1]`` to axis 1, etc.).
+        This corresponds to ``n`` for ``fft(x, n)``.
+        Along each axis, if the given shape is smaller than that of the input,
+        the input is cropped. If it is larger, the input is padded with zeros.
+        if `s` is not given, the shape of the input along the axes specified
+        by `axes` is used.
+    axes : sequence of ints, optional
+        Axes over which to compute the FFT. If not given, the last two axes are
+        used.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see `fft`). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See :func:`fft` for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : complex ndarray
+        The truncated or zero-padded input, transformed along the axes
+        indicated by `axes`, or the last two axes if `axes` is not given.
+
+    Raises
+    ------
+    ValueError
+        If `s` and `axes` have different length, or `axes` not given and
+        ``len(s) != 2``.
+    IndexError
+        If an element of `axes` is larger than the number of axes of `x`.
+
+    See Also
+    --------
+    ifft2 : The inverse 2-D FFT.
+    fft : The 1-D FFT.
+    fftn : The N-D FFT.
+    fftshift : Shifts zero-frequency terms to the center of the array.
+        For 2-D input, swaps first and third quadrants, and second
+        and fourth quadrants.
+
+    Notes
+    -----
+    `fft2` is just `fftn` with a different default for `axes`.
+
+    The output, analogously to `fft`, contains the term for zero frequency in
+    the low-order corner of the transformed axes, the positive frequency terms
+    in the first half of these axes, the term for the Nyquist frequency in the
+    middle of the axes and the negative frequency terms in the second half of
+    the axes, in order of decreasingly negative frequency.
+
+    See `fftn` for details and a plotting example, and `fft` for
+    definitions and conventions used.
+
+
+    Examples
+    --------
+    >>> import scipy.fft
+    >>> import numpy as np
+    >>> x = np.mgrid[:5, :5][0]
+    >>> scipy.fft.fft2(x)
+    array([[ 50.  +0.j        ,   0.  +0.j        ,   0.  +0.j        , # may vary
+              0.  +0.j        ,   0.  +0.j        ],
+           [-12.5+17.20477401j,   0.  +0.j        ,   0.  +0.j        ,
+              0.  +0.j        ,   0.  +0.j        ],
+           [-12.5 +4.0614962j ,   0.  +0.j        ,   0.  +0.j        ,
+              0.  +0.j        ,   0.  +0.j        ],
+           [-12.5 -4.0614962j ,   0.  +0.j        ,   0.  +0.j        ,
+              0.  +0.j        ,   0.  +0.j        ],
+           [-12.5-17.20477401j,   0.  +0.j        ,   0.  +0.j        ,
+              0.  +0.j        ,   0.  +0.j        ]])
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def ifft2(x, s=None, axes=(-2, -1), norm=None, overwrite_x=False, workers=None, *,
+          plan=None):
+    """
+    Compute the 2-D inverse discrete Fourier Transform.
+
+    This function computes the inverse of the 2-D discrete Fourier
+    Transform over any number of axes in an M-D array by means of
+    the Fast Fourier Transform (FFT). In other words, ``ifft2(fft2(x)) == x``
+    to within numerical accuracy. By default, the inverse transform is
+    computed over the last two axes of the input array.
+
+    The input, analogously to `ifft`, should be ordered in the same way as is
+    returned by `fft2`, i.e., it should have the term for zero frequency
+    in the low-order corner of the two axes, the positive frequency terms in
+    the first half of these axes, the term for the Nyquist frequency in the
+    middle of the axes and the negative frequency terms in the second half of
+    both axes, in order of decreasingly negative frequency.
+
+    Parameters
+    ----------
+    x : array_like
+        Input array, can be complex.
+    s : sequence of ints, optional
+        Shape (length of each axis) of the output (``s[0]`` refers to axis 0,
+        ``s[1]`` to axis 1, etc.). This corresponds to `n` for ``ifft(x, n)``.
+        Along each axis, if the given shape is smaller than that of the input,
+        the input is cropped. If it is larger, the input is padded with zeros.
+        if `s` is not given, the shape of the input along the axes specified
+        by `axes` is used.  See notes for issue on `ifft` zero padding.
+    axes : sequence of ints, optional
+        Axes over which to compute the FFT. If not given, the last two
+        axes are used.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see `fft`). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See :func:`fft` for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : complex ndarray
+        The truncated or zero-padded input, transformed along the axes
+        indicated by `axes`, or the last two axes if `axes` is not given.
+
+    Raises
+    ------
+    ValueError
+        If `s` and `axes` have different length, or `axes` not given and
+        ``len(s) != 2``.
+    IndexError
+        If an element of `axes` is larger than the number of axes of `x`.
+
+    See Also
+    --------
+    fft2 : The forward 2-D FFT, of which `ifft2` is the inverse.
+    ifftn : The inverse of the N-D FFT.
+    fft : The 1-D FFT.
+    ifft : The 1-D inverse FFT.
+
+    Notes
+    -----
+    `ifft2` is just `ifftn` with a different default for `axes`.
+
+    See `ifftn` for details and a plotting example, and `fft` for
+    definition and conventions used.
+
+    Zero-padding, analogously with `ifft`, is performed by appending zeros to
+    the input along the specified dimension. Although this is the common
+    approach, it might lead to surprising results. If another form of zero
+    padding is desired, it must be performed before `ifft2` is called.
+
+    Examples
+    --------
+    >>> import scipy.fft
+    >>> import numpy as np
+    >>> x = 4 * np.eye(4)
+    >>> scipy.fft.ifft2(x)
+    array([[1.+0.j,  0.+0.j,  0.+0.j,  0.+0.j], # may vary
+           [0.+0.j,  0.+0.j,  0.+0.j,  1.+0.j],
+           [0.+0.j,  0.+0.j,  1.+0.j,  0.+0.j],
+           [0.+0.j,  1.+0.j,  0.+0.j,  0.+0.j]])
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def rfftn(x, s=None, axes=None, norm=None, overwrite_x=False, workers=None, *,
+          plan=None):
+    """
+    Compute the N-D discrete Fourier Transform for real input.
+
+    This function computes the N-D discrete Fourier Transform over
+    any number of axes in an M-D real array by means of the Fast
+    Fourier Transform (FFT). By default, all axes are transformed, with the
+    real transform performed over the last axis, while the remaining
+    transforms are complex.
+
+    Parameters
+    ----------
+    x : array_like
+        Input array, taken to be real.
+    s : sequence of ints, optional
+        Shape (length along each transformed axis) to use from the input.
+        (``s[0]`` refers to axis 0, ``s[1]`` to axis 1, etc.).
+        The final element of `s` corresponds to `n` for ``rfft(x, n)``, while
+        for the remaining axes, it corresponds to `n` for ``fft(x, n)``.
+        Along any axis, if the given shape is smaller than that of the input,
+        the input is cropped. If it is larger, the input is padded with zeros.
+        if `s` is not given, the shape of the input along the axes specified
+        by `axes` is used.
+    axes : sequence of ints, optional
+        Axes over which to compute the FFT. If not given, the last ``len(s)``
+        axes are used, or all axes if `s` is also not specified.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see `fft`). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See :func:`fft` for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : complex ndarray
+        The truncated or zero-padded input, transformed along the axes
+        indicated by `axes`, or by a combination of `s` and `x`,
+        as explained in the parameters section above.
+        The length of the last axis transformed will be ``s[-1]//2+1``,
+        while the remaining transformed axes will have lengths according to
+        `s`, or unchanged from the input.
+
+    Raises
+    ------
+    ValueError
+        If `s` and `axes` have different length.
+    IndexError
+        If an element of `axes` is larger than the number of axes of `x`.
+
+    See Also
+    --------
+    irfftn : The inverse of `rfftn`, i.e., the inverse of the N-D FFT
+         of real input.
+    fft : The 1-D FFT, with definitions and conventions used.
+    rfft : The 1-D FFT of real input.
+    fftn : The N-D FFT.
+    rfft2 : The 2-D FFT of real input.
+
+    Notes
+    -----
+    The transform for real input is performed over the last transformation
+    axis, as by `rfft`, then the transform over the remaining axes is
+    performed as by `fftn`. The order of the output is as for `rfft` for the
+    final transformation axis, and as for `fftn` for the remaining
+    transformation axes.
+
+    See `fft` for details, definitions and conventions used.
+
+    Examples
+    --------
+    >>> import scipy.fft
+    >>> import numpy as np
+    >>> x = np.ones((2, 2, 2))
+    >>> scipy.fft.rfftn(x)
+    array([[[8.+0.j,  0.+0.j], # may vary
+            [0.+0.j,  0.+0.j]],
+           [[0.+0.j,  0.+0.j],
+            [0.+0.j,  0.+0.j]]])
+
+    >>> scipy.fft.rfftn(x, axes=(2, 0))
+    array([[[4.+0.j,  0.+0.j], # may vary
+            [4.+0.j,  0.+0.j]],
+           [[0.+0.j,  0.+0.j],
+            [0.+0.j,  0.+0.j]]])
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def rfft2(x, s=None, axes=(-2, -1), norm=None, overwrite_x=False, workers=None, *,
+          plan=None):
+    """
+    Compute the 2-D FFT of a real array.
+
+    Parameters
+    ----------
+    x : array
+        Input array, taken to be real.
+    s : sequence of ints, optional
+        Shape of the FFT.
+    axes : sequence of ints, optional
+        Axes over which to compute the FFT.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see `fft`). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See :func:`fft` for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : ndarray
+        The result of the real 2-D FFT.
+
+    See Also
+    --------
+    irfft2 : The inverse of the 2-D FFT of real input.
+    rfft : The 1-D FFT of real input.
+    rfftn : Compute the N-D discrete Fourier Transform for real
+            input.
+
+    Notes
+    -----
+    This is really just `rfftn` with different default behavior.
+    For more details see `rfftn`.
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def irfftn(x, s=None, axes=None, norm=None, overwrite_x=False, workers=None, *,
+           plan=None):
+    """
+    Computes the inverse of `rfftn`
+
+    This function computes the inverse of the N-D discrete
+    Fourier Transform for real input over any number of axes in an
+    M-D array by means of the Fast Fourier Transform (FFT). In
+    other words, ``irfftn(rfftn(x), x.shape) == x`` to within numerical
+    accuracy. (The ``a.shape`` is necessary like ``len(a)`` is for `irfft`,
+    and for the same reason.)
+
+    The input should be ordered in the same way as is returned by `rfftn`,
+    i.e., as for `irfft` for the final transformation axis, and as for `ifftn`
+    along all the other axes.
+
+    Parameters
+    ----------
+    x : array_like
+        Input array.
+    s : sequence of ints, optional
+        Shape (length of each transformed axis) of the output
+        (``s[0]`` refers to axis 0, ``s[1]`` to axis 1, etc.). `s` is also the
+        number of input points used along this axis, except for the last axis,
+        where ``s[-1]//2+1`` points of the input are used.
+        Along any axis, if the shape indicated by `s` is smaller than that of
+        the input, the input is cropped. If it is larger, the input is padded
+        with zeros. If `s` is not given, the shape of the input along the axes
+        specified by axes is used. Except for the last axis which is taken to be
+        ``2*(m-1)``, where ``m`` is the length of the input along that axis.
+    axes : sequence of ints, optional
+        Axes over which to compute the inverse FFT. If not given, the last
+        `len(s)` axes are used, or all axes if `s` is also not specified.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see `fft`). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See :func:`fft` for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : ndarray
+        The truncated or zero-padded input, transformed along the axes
+        indicated by `axes`, or by a combination of `s` or `x`,
+        as explained in the parameters section above.
+        The length of each transformed axis is as given by the corresponding
+        element of `s`, or the length of the input in every axis except for the
+        last one if `s` is not given. In the final transformed axis the length
+        of the output when `s` is not given is ``2*(m-1)``, where ``m`` is the
+        length of the final transformed axis of the input. To get an odd
+        number of output points in the final axis, `s` must be specified.
+
+    Raises
+    ------
+    ValueError
+        If `s` and `axes` have different length.
+    IndexError
+        If an element of `axes` is larger than the number of axes of `x`.
+
+    See Also
+    --------
+    rfftn : The forward N-D FFT of real input,
+            of which `ifftn` is the inverse.
+    fft : The 1-D FFT, with definitions and conventions used.
+    irfft : The inverse of the 1-D FFT of real input.
+    irfft2 : The inverse of the 2-D FFT of real input.
+
+    Notes
+    -----
+    See `fft` for definitions and conventions used.
+
+    See `rfft` for definitions and conventions used for real input.
+
+    The default value of `s` assumes an even output length in the final
+    transformation axis. When performing the final complex to real
+    transformation, the Hermitian symmetry requires that the last imaginary
+    component along that axis must be 0 and so it is ignored. To avoid losing
+    information, the correct length of the real input *must* be given.
+
+    Examples
+    --------
+    >>> import scipy.fft
+    >>> import numpy as np
+    >>> x = np.zeros((3, 2, 2))
+    >>> x[0, 0, 0] = 3 * 2 * 2
+    >>> scipy.fft.irfftn(x)
+    array([[[1.,  1.],
+            [1.,  1.]],
+           [[1.,  1.],
+            [1.,  1.]],
+           [[1.,  1.],
+            [1.,  1.]]])
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def irfft2(x, s=None, axes=(-2, -1), norm=None, overwrite_x=False, workers=None, *,
+           plan=None):
+    """
+    Computes the inverse of `rfft2`
+
+    Parameters
+    ----------
+    x : array_like
+        The input array
+    s : sequence of ints, optional
+        Shape of the real output to the inverse FFT.
+    axes : sequence of ints, optional
+        The axes over which to compute the inverse fft.
+        Default is the last two axes.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see `fft`). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See :func:`fft` for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : ndarray
+        The result of the inverse real 2-D FFT.
+
+    See Also
+    --------
+    rfft2 : The 2-D FFT of real input.
+    irfft : The inverse of the 1-D FFT of real input.
+    irfftn : The inverse of the N-D FFT of real input.
+
+    Notes
+    -----
+    This is really `irfftn` with different defaults.
+    For more details see `irfftn`.
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def hfftn(x, s=None, axes=None, norm=None, overwrite_x=False, workers=None, *,
+          plan=None):
+    """
+    Compute the N-D FFT of Hermitian symmetric complex input, i.e., a
+    signal with a real spectrum.
+
+    This function computes the N-D discrete Fourier Transform for a
+    Hermitian symmetric complex input over any number of axes in an
+    M-D array by means of the Fast Fourier Transform (FFT). In other
+    words, ``ihfftn(hfftn(x, s)) == x`` to within numerical accuracy. (``s``
+    here is ``x.shape`` with ``s[-1] = x.shape[-1] * 2 - 1``, this is necessary
+    for the same reason ``x.shape`` would be necessary for `irfft`.)
+
+    Parameters
+    ----------
+    x : array_like
+        Input array.
+    s : sequence of ints, optional
+        Shape (length of each transformed axis) of the output
+        (``s[0]`` refers to axis 0, ``s[1]`` to axis 1, etc.). `s` is also the
+        number of input points used along this axis, except for the last axis,
+        where ``s[-1]//2+1`` points of the input are used.
+        Along any axis, if the shape indicated by `s` is smaller than that of
+        the input, the input is cropped. If it is larger, the input is padded
+        with zeros. If `s` is not given, the shape of the input along the axes
+        specified by axes is used. Except for the last axis which is taken to be
+        ``2*(m-1)`` where ``m`` is the length of the input along that axis.
+    axes : sequence of ints, optional
+        Axes over which to compute the inverse FFT. If not given, the last
+        `len(s)` axes are used, or all axes if `s` is also not specified.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see `fft`). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See :func:`fft` for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : ndarray
+        The truncated or zero-padded input, transformed along the axes
+        indicated by `axes`, or by a combination of `s` or `x`,
+        as explained in the parameters section above.
+        The length of each transformed axis is as given by the corresponding
+        element of `s`, or the length of the input in every axis except for the
+        last one if `s` is not given.  In the final transformed axis the length
+        of the output when `s` is not given is ``2*(m-1)`` where ``m`` is the
+        length of the final transformed axis of the input.  To get an odd
+        number of output points in the final axis, `s` must be specified.
+
+    Raises
+    ------
+    ValueError
+        If `s` and `axes` have different length.
+    IndexError
+        If an element of `axes` is larger than the number of axes of `x`.
+
+    See Also
+    --------
+    ihfftn : The inverse N-D FFT with real spectrum. Inverse of `hfftn`.
+    fft : The 1-D FFT, with definitions and conventions used.
+    rfft : Forward FFT of real input.
+
+    Notes
+    -----
+    For a 1-D signal ``x`` to have a real spectrum, it must satisfy
+    the Hermitian property::
+
+        x[i] == np.conj(x[-i]) for all i
+
+    This generalizes into higher dimensions by reflecting over each axis in
+    turn::
+
+        x[i, j, k, ...] == np.conj(x[-i, -j, -k, ...]) for all i, j, k, ...
+
+    This should not be confused with a Hermitian matrix, for which the
+    transpose is its own conjugate::
+
+        x[i, j] == np.conj(x[j, i]) for all i, j
+
+
+    The default value of `s` assumes an even output length in the final
+    transformation axis. When performing the final complex to real
+    transformation, the Hermitian symmetry requires that the last imaginary
+    component along that axis must be 0 and so it is ignored. To avoid losing
+    information, the correct length of the real input *must* be given.
+
+    Examples
+    --------
+    >>> import scipy.fft
+    >>> import numpy as np
+    >>> x = np.ones((3, 2, 2))
+    >>> scipy.fft.hfftn(x)
+    array([[[12.,  0.],
+            [ 0.,  0.]],
+           [[ 0.,  0.],
+            [ 0.,  0.]],
+           [[ 0.,  0.],
+            [ 0.,  0.]]])
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def hfft2(x, s=None, axes=(-2, -1), norm=None, overwrite_x=False, workers=None, *,
+          plan=None):
+    """
+    Compute the 2-D FFT of a Hermitian complex array.
+
+    Parameters
+    ----------
+    x : array
+        Input array, taken to be Hermitian complex.
+    s : sequence of ints, optional
+        Shape of the real output.
+    axes : sequence of ints, optional
+        Axes over which to compute the FFT.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see `fft`). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See `fft` for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : ndarray
+        The real result of the 2-D Hermitian complex real FFT.
+
+    See Also
+    --------
+    hfftn : Compute the N-D discrete Fourier Transform for Hermitian
+            complex input.
+
+    Notes
+    -----
+    This is really just `hfftn` with different default behavior.
+    For more details see `hfftn`.
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def ihfftn(x, s=None, axes=None, norm=None, overwrite_x=False, workers=None, *,
+           plan=None):
+    """
+    Compute the N-D inverse discrete Fourier Transform for a real
+    spectrum.
+
+    This function computes the N-D inverse discrete Fourier Transform
+    over any number of axes in an M-D real array by means of the Fast
+    Fourier Transform (FFT). By default, all axes are transformed, with the
+    real transform performed over the last axis, while the remaining transforms
+    are complex.
+
+    Parameters
+    ----------
+    x : array_like
+        Input array, taken to be real.
+    s : sequence of ints, optional
+        Shape (length along each transformed axis) to use from the input.
+        (``s[0]`` refers to axis 0, ``s[1]`` to axis 1, etc.).
+        Along any axis, if the given shape is smaller than that of the input,
+        the input is cropped. If it is larger, the input is padded with zeros.
+        if `s` is not given, the shape of the input along the axes specified
+        by `axes` is used.
+    axes : sequence of ints, optional
+        Axes over which to compute the FFT. If not given, the last ``len(s)``
+        axes are used, or all axes if `s` is also not specified.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see `fft`). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See :func:`fft` for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : complex ndarray
+        The truncated or zero-padded input, transformed along the axes
+        indicated by `axes`, or by a combination of `s` and `x`,
+        as explained in the parameters section above.
+        The length of the last axis transformed will be ``s[-1]//2+1``,
+        while the remaining transformed axes will have lengths according to
+        `s`, or unchanged from the input.
+
+    Raises
+    ------
+    ValueError
+        If `s` and `axes` have different length.
+    IndexError
+        If an element of `axes` is larger than the number of axes of `x`.
+
+    See Also
+    --------
+    hfftn : The forward N-D FFT of Hermitian input.
+    hfft : The 1-D FFT of Hermitian input.
+    fft : The 1-D FFT, with definitions and conventions used.
+    fftn : The N-D FFT.
+    hfft2 : The 2-D FFT of Hermitian input.
+
+    Notes
+    -----
+    The transform for real input is performed over the last transformation
+    axis, as by `ihfft`, then the transform over the remaining axes is
+    performed as by `ifftn`. The order of the output is the positive part of
+    the Hermitian output signal, in the same format as `rfft`.
+
+    Examples
+    --------
+    >>> import scipy.fft
+    >>> import numpy as np
+    >>> x = np.ones((2, 2, 2))
+    >>> scipy.fft.ihfftn(x)
+    array([[[1.+0.j,  0.+0.j], # may vary
+            [0.+0.j,  0.+0.j]],
+           [[0.+0.j,  0.+0.j],
+            [0.+0.j,  0.+0.j]]])
+    >>> scipy.fft.ihfftn(x, axes=(2, 0))
+    array([[[1.+0.j,  0.+0.j], # may vary
+            [1.+0.j,  0.+0.j]],
+           [[0.+0.j,  0.+0.j],
+            [0.+0.j,  0.+0.j]]])
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def ihfft2(x, s=None, axes=(-2, -1), norm=None, overwrite_x=False, workers=None, *,
+           plan=None):
+    """
+    Compute the 2-D inverse FFT of a real spectrum.
+
+    Parameters
+    ----------
+    x : array_like
+        The input array
+    s : sequence of ints, optional
+        Shape of the real input to the inverse FFT.
+    axes : sequence of ints, optional
+        The axes over which to compute the inverse fft.
+        Default is the last two axes.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see `fft`). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+        See :func:`fft` for more details.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    plan : object, optional
+        This argument is reserved for passing in a precomputed plan provided
+        by downstream FFT vendors. It is currently not used in SciPy.
+
+        .. versionadded:: 1.5.0
+
+    Returns
+    -------
+    out : ndarray
+        The result of the inverse real 2-D FFT.
+
+    See Also
+    --------
+    ihfftn : Compute the inverse of the N-D FFT of Hermitian input.
+
+    Notes
+    -----
+    This is really `ihfftn` with different defaults.
+    For more details see `ihfftn`.
+
+    """
+    return (Dispatchable(x, np.ndarray),)

parrot/lib/python3.10/site-packages/scipy/fft/_basic_backend.py

@@ -0,0 +1,180 @@
+from scipy._lib._array_api import (
+    array_namespace, is_numpy, xp_unsupported_param_msg, is_complex
+)
+from . import _pocketfft
+import numpy as np
+
+
+def _validate_fft_args(workers, plan, norm):
+    if workers is not None:
+        raise ValueError(xp_unsupported_param_msg("workers"))
+    if plan is not None:
+        raise ValueError(xp_unsupported_param_msg("plan"))
+    if norm is None:
+        norm = 'backward'
+    return norm
+
+
+# pocketfft is used whenever SCIPY_ARRAY_API is not set,
+# or x is a NumPy array or array-like.
+# When SCIPY_ARRAY_API is set, we try to use xp.fft for CuPy arrays,
+# PyTorch arrays and other array API standard supporting objects.
+# If xp.fft does not exist, we attempt to convert to np and back to use pocketfft.
+
+def _execute_1D(func_str, pocketfft_func, x, n, axis, norm, overwrite_x, workers, plan):
+    xp = array_namespace(x)
+
+    if is_numpy(xp):
+        x = np.asarray(x)
+        return pocketfft_func(x, n=n, axis=axis, norm=norm,
+                              overwrite_x=overwrite_x, workers=workers, plan=plan)
+
+    norm = _validate_fft_args(workers, plan, norm)
+    if hasattr(xp, 'fft'):
+        xp_func = getattr(xp.fft, func_str)
+        return xp_func(x, n=n, axis=axis, norm=norm)
+
+    x = np.asarray(x)
+    y = pocketfft_func(x, n=n, axis=axis, norm=norm)
+    return xp.asarray(y)
+
+
+def _execute_nD(func_str, pocketfft_func, x, s, axes, norm, overwrite_x, workers, plan):
+    xp = array_namespace(x)
+    
+    if is_numpy(xp):
+        x = np.asarray(x)
+        return pocketfft_func(x, s=s, axes=axes, norm=norm,
+                              overwrite_x=overwrite_x, workers=workers, plan=plan)
+
+    norm = _validate_fft_args(workers, plan, norm)
+    if hasattr(xp, 'fft'):
+        xp_func = getattr(xp.fft, func_str)
+        return xp_func(x, s=s, axes=axes, norm=norm)
+
+    x = np.asarray(x)
+    y = pocketfft_func(x, s=s, axes=axes, norm=norm)
+    return xp.asarray(y)
+
+
+def fft(x, n=None, axis=-1, norm=None,
+        overwrite_x=False, workers=None, *, plan=None):
+    return _execute_1D('fft', _pocketfft.fft, x, n=n, axis=axis, norm=norm,
+                       overwrite_x=overwrite_x, workers=workers, plan=plan)
+
+
+def ifft(x, n=None, axis=-1, norm=None, overwrite_x=False, workers=None, *,
+         plan=None):
+    return _execute_1D('ifft', _pocketfft.ifft, x, n=n, axis=axis, norm=norm,
+                       overwrite_x=overwrite_x, workers=workers, plan=plan)
+
+
+def rfft(x, n=None, axis=-1, norm=None,
+         overwrite_x=False, workers=None, *, plan=None):
+    return _execute_1D('rfft', _pocketfft.rfft, x, n=n, axis=axis, norm=norm,
+                       overwrite_x=overwrite_x, workers=workers, plan=plan)
+
+
+def irfft(x, n=None, axis=-1, norm=None,
+          overwrite_x=False, workers=None, *, plan=None):
+    return _execute_1D('irfft', _pocketfft.irfft, x, n=n, axis=axis, norm=norm,
+                       overwrite_x=overwrite_x, workers=workers, plan=plan)
+
+
+def hfft(x, n=None, axis=-1, norm=None,
+         overwrite_x=False, workers=None, *, plan=None):
+    return _execute_1D('hfft', _pocketfft.hfft, x, n=n, axis=axis, norm=norm,
+                       overwrite_x=overwrite_x, workers=workers, plan=plan)
+
+
+def ihfft(x, n=None, axis=-1, norm=None,
+          overwrite_x=False, workers=None, *, plan=None):
+    return _execute_1D('ihfft', _pocketfft.ihfft, x, n=n, axis=axis, norm=norm,
+                       overwrite_x=overwrite_x, workers=workers, plan=plan)
+
+
+def fftn(x, s=None, axes=None, norm=None,
+         overwrite_x=False, workers=None, *, plan=None):
+    return _execute_nD('fftn', _pocketfft.fftn, x, s=s, axes=axes, norm=norm,
+                       overwrite_x=overwrite_x, workers=workers, plan=plan)
+
+
+
+def ifftn(x, s=None, axes=None, norm=None,
+          overwrite_x=False, workers=None, *, plan=None):
+    return _execute_nD('ifftn', _pocketfft.ifftn, x, s=s, axes=axes, norm=norm,
+                       overwrite_x=overwrite_x, workers=workers, plan=plan)
+
+
+def fft2(x, s=None, axes=(-2, -1), norm=None,
+         overwrite_x=False, workers=None, *, plan=None):
+    return fftn(x, s, axes, norm, overwrite_x, workers, plan=plan)
+
+
+def ifft2(x, s=None, axes=(-2, -1), norm=None,
+          overwrite_x=False, workers=None, *, plan=None):
+    return ifftn(x, s, axes, norm, overwrite_x, workers, plan=plan)
+
+
+def rfftn(x, s=None, axes=None, norm=None,
+          overwrite_x=False, workers=None, *, plan=None):
+    return _execute_nD('rfftn', _pocketfft.rfftn, x, s=s, axes=axes, norm=norm,
+                       overwrite_x=overwrite_x, workers=workers, plan=plan)
+
+
+def rfft2(x, s=None, axes=(-2, -1), norm=None,
+         overwrite_x=False, workers=None, *, plan=None):
+    return rfftn(x, s, axes, norm, overwrite_x, workers, plan=plan)
+
+
+def irfftn(x, s=None, axes=None, norm=None,
+           overwrite_x=False, workers=None, *, plan=None):
+    return _execute_nD('irfftn', _pocketfft.irfftn, x, s=s, axes=axes, norm=norm,
+                       overwrite_x=overwrite_x, workers=workers, plan=plan)
+
+
+def irfft2(x, s=None, axes=(-2, -1), norm=None,
+           overwrite_x=False, workers=None, *, plan=None):
+    return irfftn(x, s, axes, norm, overwrite_x, workers, plan=plan)
+
+
+def _swap_direction(norm):
+    if norm in (None, 'backward'):
+        norm = 'forward'
+    elif norm == 'forward':
+        norm = 'backward'
+    elif norm != 'ortho':
+        raise ValueError('Invalid norm value %s; should be "backward", '
+                         '"ortho", or "forward".' % norm)
+    return norm
+
+
+def hfftn(x, s=None, axes=None, norm=None,
+          overwrite_x=False, workers=None, *, plan=None):
+    xp = array_namespace(x)
+    if is_numpy(xp):
+        x = np.asarray(x)
+        return _pocketfft.hfftn(x, s, axes, norm, overwrite_x, workers, plan=plan)
+    if is_complex(x, xp):
+        x = xp.conj(x)
+    return irfftn(x, s, axes, _swap_direction(norm),
+                  overwrite_x, workers, plan=plan)
+
+
+def hfft2(x, s=None, axes=(-2, -1), norm=None,
+          overwrite_x=False, workers=None, *, plan=None):
+    return hfftn(x, s, axes, norm, overwrite_x, workers, plan=plan)
+
+
+def ihfftn(x, s=None, axes=None, norm=None,
+           overwrite_x=False, workers=None, *, plan=None):
+    xp = array_namespace(x)
+    if is_numpy(xp):
+        x = np.asarray(x)
+        return _pocketfft.ihfftn(x, s, axes, norm, overwrite_x, workers, plan=plan)
+    return xp.conj(rfftn(x, s, axes, _swap_direction(norm),
+                         overwrite_x, workers, plan=plan))
+
+def ihfft2(x, s=None, axes=(-2, -1), norm=None,
+           overwrite_x=False, workers=None, *, plan=None):
+    return ihfftn(x, s, axes, norm, overwrite_x, workers, plan=plan)

parrot/lib/python3.10/site-packages/scipy/fft/_debug_backends.py

@@ -0,0 +1,22 @@
+import numpy as np
+
+class NumPyBackend:
+    """Backend that uses numpy.fft"""
+    __ua_domain__ = "numpy.scipy.fft"
+
+    @staticmethod
+    def __ua_function__(method, args, kwargs):
+        kwargs.pop("overwrite_x", None)
+
+        fn = getattr(np.fft, method.__name__, None)
+        return (NotImplemented if fn is None
+                else fn(*args, **kwargs))
+
+
+class EchoBackend:
+    """Backend that just prints the __ua_function__ arguments"""
+    __ua_domain__ = "numpy.scipy.fft"
+
+    @staticmethod
+    def __ua_function__(method, args, kwargs):
+        print(method, args, kwargs, sep='\n')

parrot/lib/python3.10/site-packages/scipy/fft/_fftlog.py

@@ -0,0 +1,223 @@
+"""Fast Hankel transforms using the FFTLog algorithm.
+
+The implementation closely follows the Fortran code of Hamilton (2000).
+
+added: 14/11/2020 Nicolas Tessore <n.tessore@ucl.ac.uk>
+"""
+
+from ._basic import _dispatch
+from scipy._lib.uarray import Dispatchable
+from ._fftlog_backend import fhtoffset
+import numpy as np
+
+__all__ = ['fht', 'ifht', 'fhtoffset']
+
+
+@_dispatch
+def fht(a, dln, mu, offset=0.0, bias=0.0):
+    r'''Compute the fast Hankel transform.
+
+    Computes the discrete Hankel transform of a logarithmically spaced periodic
+    sequence using the FFTLog algorithm [1]_, [2]_.
+
+    Parameters
+    ----------
+    a : array_like (..., n)
+        Real periodic input array, uniformly logarithmically spaced.  For
+        multidimensional input, the transform is performed over the last axis.
+    dln : float
+        Uniform logarithmic spacing of the input array.
+    mu : float
+        Order of the Hankel transform, any positive or negative real number.
+    offset : float, optional
+        Offset of the uniform logarithmic spacing of the output array.
+    bias : float, optional
+        Exponent of power law bias, any positive or negative real number.
+
+    Returns
+    -------
+    A : array_like (..., n)
+        The transformed output array, which is real, periodic, uniformly
+        logarithmically spaced, and of the same shape as the input array.
+
+    See Also
+    --------
+    ifht : The inverse of `fht`.
+    fhtoffset : Return an optimal offset for `fht`.
+
+    Notes
+    -----
+    This function computes a discrete version of the Hankel transform
+
+    .. math::
+
+        A(k) = \int_{0}^{\infty} \! a(r) \, J_\mu(kr) \, k \, dr \;,
+
+    where :math:`J_\mu` is the Bessel function of order :math:`\mu`.  The index
+    :math:`\mu` may be any real number, positive or negative.  Note that the
+    numerical Hankel transform uses an integrand of :math:`k \, dr`, while the
+    mathematical Hankel transform is commonly defined using :math:`r \, dr`.
+
+    The input array `a` is a periodic sequence of length :math:`n`, uniformly
+    logarithmically spaced with spacing `dln`,
+
+    .. math::
+
+        a_j = a(r_j) \;, \quad
+        r_j = r_c \exp[(j-j_c) \, \mathtt{dln}]
+
+    centred about the point :math:`r_c`.  Note that the central index
+    :math:`j_c = (n-1)/2` is half-integral if :math:`n` is even, so that
+    :math:`r_c` falls between two input elements.  Similarly, the output
+    array `A` is a periodic sequence of length :math:`n`, also uniformly
+    logarithmically spaced with spacing `dln`
+
+    .. math::
+
+       A_j = A(k_j) \;, \quad
+       k_j = k_c \exp[(j-j_c) \, \mathtt{dln}]
+
+    centred about the point :math:`k_c`.
+
+    The centre points :math:`r_c` and :math:`k_c` of the periodic intervals may
+    be chosen arbitrarily, but it would be usual to choose the product
+    :math:`k_c r_c = k_j r_{n-1-j} = k_{n-1-j} r_j` to be unity.  This can be
+    changed using the `offset` parameter, which controls the logarithmic offset
+    :math:`\log(k_c) = \mathtt{offset} - \log(r_c)` of the output array.
+    Choosing an optimal value for `offset` may reduce ringing of the discrete
+    Hankel transform.
+
+    If the `bias` parameter is nonzero, this function computes a discrete
+    version of the biased Hankel transform
+
+    .. math::
+
+        A(k) = \int_{0}^{\infty} \! a_q(r) \, (kr)^q \, J_\mu(kr) \, k \, dr
+
+    where :math:`q` is the value of `bias`, and a power law bias
+    :math:`a_q(r) = a(r) \, (kr)^{-q}` is applied to the input sequence.
+    Biasing the transform can help approximate the continuous transform of
+    :math:`a(r)` if there is a value :math:`q` such that :math:`a_q(r)` is
+    close to a periodic sequence, in which case the resulting :math:`A(k)` will
+    be close to the continuous transform.
+
+    References
+    ----------
+    .. [1] Talman J. D., 1978, J. Comp. Phys., 29, 35
+    .. [2] Hamilton A. J. S., 2000, MNRAS, 312, 257 (astro-ph/9905191)
+
+    Examples
+    --------
+
+    This example is the adapted version of ``fftlogtest.f`` which is provided
+    in [2]_. It evaluates the integral
+
+    .. math::
+
+        \int^\infty_0 r^{\mu+1} \exp(-r^2/2) J_\mu(k, r) k dr
+        = k^{\mu+1} \exp(-k^2/2) .
+
+    >>> import numpy as np
+    >>> from scipy import fft
+    >>> import matplotlib.pyplot as plt
+
+    Parameters for the transform.
+
+    >>> mu = 0.0                     # Order mu of Bessel function
+    >>> r = np.logspace(-7, 1, 128)  # Input evaluation points
+    >>> dln = np.log(r[1]/r[0])      # Step size
+    >>> offset = fft.fhtoffset(dln, initial=-6*np.log(10), mu=mu)
+    >>> k = np.exp(offset)/r[::-1]   # Output evaluation points
+
+    Define the analytical function.
+
+    >>> def f(x, mu):
+    ...     """Analytical function: x^(mu+1) exp(-x^2/2)."""
+    ...     return x**(mu + 1)*np.exp(-x**2/2)
+
+    Evaluate the function at ``r`` and compute the corresponding values at
+    ``k`` using FFTLog.
+
+    >>> a_r = f(r, mu)
+    >>> fht = fft.fht(a_r, dln, mu=mu, offset=offset)
+
+    For this example we can actually compute the analytical response (which in
+    this case is the same as the input function) for comparison and compute the
+    relative error.
+
+    >>> a_k = f(k, mu)
+    >>> rel_err = abs((fht-a_k)/a_k)
+
+    Plot the result.
+
+    >>> figargs = {'sharex': True, 'sharey': True, 'constrained_layout': True}
+    >>> fig, (ax1, ax2) = plt.subplots(1, 2, figsize=(10, 4), **figargs)
+    >>> ax1.set_title(r'$r^{\mu+1}\ \exp(-r^2/2)$')
+    >>> ax1.loglog(r, a_r, 'k', lw=2)
+    >>> ax1.set_xlabel('r')
+    >>> ax2.set_title(r'$k^{\mu+1} \exp(-k^2/2)$')
+    >>> ax2.loglog(k, a_k, 'k', lw=2, label='Analytical')
+    >>> ax2.loglog(k, fht, 'C3--', lw=2, label='FFTLog')
+    >>> ax2.set_xlabel('k')
+    >>> ax2.legend(loc=3, framealpha=1)
+    >>> ax2.set_ylim([1e-10, 1e1])
+    >>> ax2b = ax2.twinx()
+    >>> ax2b.loglog(k, rel_err, 'C0', label='Rel. Error (-)')
+    >>> ax2b.set_ylabel('Rel. Error (-)', color='C0')
+    >>> ax2b.tick_params(axis='y', labelcolor='C0')
+    >>> ax2b.legend(loc=4, framealpha=1)
+    >>> ax2b.set_ylim([1e-9, 1e-3])
+    >>> plt.show()
+
+    '''
+    return (Dispatchable(a, np.ndarray),)
+
+
+@_dispatch
+def ifht(A, dln, mu, offset=0.0, bias=0.0):
+    r"""Compute the inverse fast Hankel transform.
+
+    Computes the discrete inverse Hankel transform of a logarithmically spaced
+    periodic sequence. This is the inverse operation to `fht`.
+
+    Parameters
+    ----------
+    A : array_like (..., n)
+        Real periodic input array, uniformly logarithmically spaced.  For
+        multidimensional input, the transform is performed over the last axis.
+    dln : float
+        Uniform logarithmic spacing of the input array.
+    mu : float
+        Order of the Hankel transform, any positive or negative real number.
+    offset : float, optional
+        Offset of the uniform logarithmic spacing of the output array.
+    bias : float, optional
+        Exponent of power law bias, any positive or negative real number.
+
+    Returns
+    -------
+    a : array_like (..., n)
+        The transformed output array, which is real, periodic, uniformly
+        logarithmically spaced, and of the same shape as the input array.
+
+    See Also
+    --------
+    fht : Definition of the fast Hankel transform.
+    fhtoffset : Return an optimal offset for `ifht`.
+
+    Notes
+    -----
+    This function computes a discrete version of the Hankel transform
+
+    .. math::
+
+        a(r) = \int_{0}^{\infty} \! A(k) \, J_\mu(kr) \, r \, dk \;,
+
+    where :math:`J_\mu` is the Bessel function of order :math:`\mu`.  The index
+    :math:`\mu` may be any real number, positive or negative. Note that the
+    numerical inverse Hankel transform uses an integrand of :math:`r \, dk`, while the
+    mathematical inverse Hankel transform is commonly defined using :math:`k \, dk`.
+
+    See `fht` for further details.
+    """
+    return (Dispatchable(A, np.ndarray),)

parrot/lib/python3.10/site-packages/scipy/fft/_fftlog_backend.py

@@ -0,0 +1,199 @@
+import numpy as np
+from warnings import warn
+from ._basic import rfft, irfft
+from ..special import loggamma, poch
+
+from scipy._lib._array_api import array_namespace, copy
+
+__all__ = ['fht', 'ifht', 'fhtoffset']
+
+# constants
+LN_2 = np.log(2)
+
+
+def fht(a, dln, mu, offset=0.0, bias=0.0):
+    xp = array_namespace(a)
+    a = xp.asarray(a)
+
+    # size of transform
+    n = a.shape[-1]
+
+    # bias input array
+    if bias != 0:
+        # a_q(r) = a(r) (r/r_c)^{-q}
+        j_c = (n-1)/2
+        j = xp.arange(n, dtype=xp.float64)
+        a = a * xp.exp(-bias*(j - j_c)*dln)
+
+    # compute FHT coefficients
+    u = xp.asarray(fhtcoeff(n, dln, mu, offset=offset, bias=bias))
+
+    # transform
+    A = _fhtq(a, u, xp=xp)
+
+    # bias output array
+    if bias != 0:
+        # A(k) = A_q(k) (k/k_c)^{-q} (k_c r_c)^{-q}
+        A *= xp.exp(-bias*((j - j_c)*dln + offset))
+
+    return A
+
+
+def ifht(A, dln, mu, offset=0.0, bias=0.0):
+    xp = array_namespace(A)
+    A = xp.asarray(A)
+
+    # size of transform
+    n = A.shape[-1]
+
+    # bias input array
+    if bias != 0:
+        # A_q(k) = A(k) (k/k_c)^{q} (k_c r_c)^{q}
+        j_c = (n-1)/2
+        j = xp.arange(n, dtype=xp.float64)
+        A = A * xp.exp(bias*((j - j_c)*dln + offset))
+
+    # compute FHT coefficients
+    u = xp.asarray(fhtcoeff(n, dln, mu, offset=offset, bias=bias, inverse=True))
+
+    # transform
+    a = _fhtq(A, u, inverse=True, xp=xp)
+
+    # bias output array
+    if bias != 0:
+        # a(r) = a_q(r) (r/r_c)^{q}
+        a /= xp.exp(-bias*(j - j_c)*dln)
+
+    return a
+
+
+def fhtcoeff(n, dln, mu, offset=0.0, bias=0.0, inverse=False):
+    """Compute the coefficient array for a fast Hankel transform."""
+    lnkr, q = offset, bias
+
+    # Hankel transform coefficients
+    # u_m = (kr)^{-i 2m pi/(n dlnr)} U_mu(q + i 2m pi/(n dlnr))
+    # with U_mu(x) = 2^x Gamma((mu+1+x)/2)/Gamma((mu+1-x)/2)
+    xp = (mu+1+q)/2
+    xm = (mu+1-q)/2
+    y = np.linspace(0, np.pi*(n//2)/(n*dln), n//2+1)
+    u = np.empty(n//2+1, dtype=complex)
+    v = np.empty(n//2+1, dtype=complex)
+    u.imag[:] = y
+    u.real[:] = xm
+    loggamma(u, out=v)
+    u.real[:] = xp
+    loggamma(u, out=u)
+    y *= 2*(LN_2 - lnkr)
+    u.real -= v.real
+    u.real += LN_2*q
+    u.imag += v.imag
+    u.imag += y
+    np.exp(u, out=u)
+
+    # fix last coefficient to be real
+    u.imag[-1] = 0
+
+    # deal with special cases
+    if not np.isfinite(u[0]):
+        # write u_0 = 2^q Gamma(xp)/Gamma(xm) = 2^q poch(xm, xp-xm)
+        # poch() handles special cases for negative integers correctly
+        u[0] = 2**q * poch(xm, xp-xm)
+        # the coefficient may be inf or 0, meaning the transform or the
+        # inverse transform, respectively, is singular
+
+    # check for singular transform or singular inverse transform
+    if np.isinf(u[0]) and not inverse:
+        warn('singular transform; consider changing the bias', stacklevel=3)
+        # fix coefficient to obtain (potentially correct) transform anyway
+        u = copy(u)
+        u[0] = 0
+    elif u[0] == 0 and inverse:
+        warn('singular inverse transform; consider changing the bias', stacklevel=3)
+        # fix coefficient to obtain (potentially correct) inverse anyway
+        u = copy(u)
+        u[0] = np.inf
+
+    return u
+
+
+def fhtoffset(dln, mu, initial=0.0, bias=0.0):
+    """Return optimal offset for a fast Hankel transform.
+
+    Returns an offset close to `initial` that fulfils the low-ringing
+    condition of [1]_ for the fast Hankel transform `fht` with logarithmic
+    spacing `dln`, order `mu` and bias `bias`.
+
+    Parameters
+    ----------
+    dln : float
+        Uniform logarithmic spacing of the transform.
+    mu : float
+        Order of the Hankel transform, any positive or negative real number.
+    initial : float, optional
+        Initial value for the offset. Returns the closest value that fulfils
+        the low-ringing condition.
+    bias : float, optional
+        Exponent of power law bias, any positive or negative real number.
+
+    Returns
+    -------
+    offset : float
+        Optimal offset of the uniform logarithmic spacing of the transform that
+        fulfils a low-ringing condition.
+
+    Examples
+    --------
+    >>> from scipy.fft import fhtoffset
+    >>> dln = 0.1
+    >>> mu = 2.0
+    >>> initial = 0.5
+    >>> bias = 0.0
+    >>> offset = fhtoffset(dln, mu, initial, bias)
+    >>> offset
+    0.5454581477676637
+
+    See Also
+    --------
+    fht : Definition of the fast Hankel transform.
+
+    References
+    ----------
+    .. [1] Hamilton A. J. S., 2000, MNRAS, 312, 257 (astro-ph/9905191)
+
+    """
+
+    lnkr, q = initial, bias
+
+    xp = (mu+1+q)/2
+    xm = (mu+1-q)/2
+    y = np.pi/(2*dln)
+    zp = loggamma(xp + 1j*y)
+    zm = loggamma(xm + 1j*y)
+    arg = (LN_2 - lnkr)/dln + (zp.imag + zm.imag)/np.pi
+    return lnkr + (arg - np.round(arg))*dln
+
+
+def _fhtq(a, u, inverse=False, *, xp=None):
+    """Compute the biased fast Hankel transform.
+
+    This is the basic FFTLog routine.
+    """
+    if xp is None:
+        xp = np
+
+    # size of transform
+    n = a.shape[-1]
+
+    # biased fast Hankel transform via real FFT
+    A = rfft(a, axis=-1)
+    if not inverse:
+        # forward transform
+        A *= u
+    else:
+        # backward transform
+        A /= xp.conj(u)
+    A = irfft(A, n, axis=-1)
+    A = xp.flip(A, axis=-1)
+
+    return A

parrot/lib/python3.10/site-packages/scipy/fft/_helper.py

@@ -0,0 +1,379 @@
+from functools import update_wrapper, lru_cache
+import inspect
+
+from ._pocketfft import helper as _helper
+
+import numpy as np
+from scipy._lib._array_api import array_namespace
+
+
+def next_fast_len(target, real=False):
+    """Find the next fast size of input data to ``fft``, for zero-padding, etc.
+
+    SciPy's FFT algorithms gain their speed by a recursive divide and conquer
+    strategy. This relies on efficient functions for small prime factors of the
+    input length. Thus, the transforms are fastest when using composites of the
+    prime factors handled by the fft implementation. If there are efficient
+    functions for all radices <= `n`, then the result will be a number `x`
+    >= ``target`` with only prime factors < `n`. (Also known as `n`-smooth
+    numbers)
+
+    Parameters
+    ----------
+    target : int
+        Length to start searching from. Must be a positive integer.
+    real : bool, optional
+        True if the FFT involves real input or output (e.g., `rfft` or `hfft`
+        but not `fft`). Defaults to False.
+
+    Returns
+    -------
+    out : int
+        The smallest fast length greater than or equal to ``target``.
+
+    Notes
+    -----
+    The result of this function may change in future as performance
+    considerations change, for example, if new prime factors are added.
+
+    Calling `fft` or `ifft` with real input data performs an ``'R2C'``
+    transform internally.
+
+    Examples
+    --------
+    On a particular machine, an FFT of prime length takes 11.4 ms:
+
+    >>> from scipy import fft
+    >>> import numpy as np
+    >>> rng = np.random.default_rng()
+    >>> min_len = 93059  # prime length is worst case for speed
+    >>> a = rng.standard_normal(min_len)
+    >>> b = fft.fft(a)
+
+    Zero-padding to the next regular length reduces computation time to
+    1.6 ms, a speedup of 7.3 times:
+
+    >>> fft.next_fast_len(min_len, real=True)
+    93312
+    >>> b = fft.fft(a, 93312)
+
+    Rounding up to the next power of 2 is not optimal, taking 3.0 ms to
+    compute; 1.9 times longer than the size given by ``next_fast_len``:
+
+    >>> b = fft.fft(a, 131072)
+
+    """
+    pass
+
+
+# Directly wrap the c-function good_size but take the docstring etc., from the
+# next_fast_len function above
+_sig = inspect.signature(next_fast_len)
+next_fast_len = update_wrapper(lru_cache(_helper.good_size), next_fast_len)
+next_fast_len.__wrapped__ = _helper.good_size
+next_fast_len.__signature__ = _sig
+
+
+def prev_fast_len(target, real=False):
+    """Find the previous fast size of input data to ``fft``.
+    Useful for discarding a minimal number of samples before FFT.
+
+    SciPy's FFT algorithms gain their speed by a recursive divide and conquer
+    strategy. This relies on efficient functions for small prime factors of the
+    input length. Thus, the transforms are fastest when using composites of the
+    prime factors handled by the fft implementation. If there are efficient
+    functions for all radices <= `n`, then the result will be a number `x`
+    <= ``target`` with only prime factors <= `n`. (Also known as `n`-smooth
+    numbers)
+
+    Parameters
+    ----------
+    target : int
+        Maximum length to search until. Must be a positive integer.
+    real : bool, optional
+        True if the FFT involves real input or output (e.g., `rfft` or `hfft`
+        but not `fft`). Defaults to False.
+
+    Returns
+    -------
+    out : int
+        The largest fast length less than or equal to ``target``.
+
+    Notes
+    -----
+    The result of this function may change in future as performance
+    considerations change, for example, if new prime factors are added.
+
+    Calling `fft` or `ifft` with real input data performs an ``'R2C'``
+    transform internally.
+
+    In the current implementation, prev_fast_len assumes radices of
+    2,3,5,7,11 for complex FFT and 2,3,5 for real FFT.
+
+    Examples
+    --------
+    On a particular machine, an FFT of prime length takes 16.2 ms:
+
+    >>> from scipy import fft
+    >>> import numpy as np
+    >>> rng = np.random.default_rng()
+    >>> max_len = 93059  # prime length is worst case for speed
+    >>> a = rng.standard_normal(max_len)
+    >>> b = fft.fft(a)
+
+    Performing FFT on the maximum fast length less than max_len
+    reduces the computation time to 1.5 ms, a speedup of 10.5 times:
+
+    >>> fft.prev_fast_len(max_len, real=True)
+    92160
+    >>> c = fft.fft(a[:92160]) # discard last 899 samples
+
+    """
+    pass
+
+
+# Directly wrap the c-function prev_good_size but take the docstring etc.,
+# from the prev_fast_len function above
+_sig_prev_fast_len = inspect.signature(prev_fast_len)
+prev_fast_len = update_wrapper(lru_cache()(_helper.prev_good_size), prev_fast_len)
+prev_fast_len.__wrapped__ = _helper.prev_good_size
+prev_fast_len.__signature__ = _sig_prev_fast_len
+
+
+def _init_nd_shape_and_axes(x, shape, axes):
+    """Handle shape and axes arguments for N-D transforms.
+
+    Returns the shape and axes in a standard form, taking into account negative
+    values and checking for various potential errors.
+
+    Parameters
+    ----------
+    x : array_like
+        The input array.
+    shape : int or array_like of ints or None
+        The shape of the result. If both `shape` and `axes` (see below) are
+        None, `shape` is ``x.shape``; if `shape` is None but `axes` is
+        not None, then `shape` is ``numpy.take(x.shape, axes, axis=0)``.
+        If `shape` is -1, the size of the corresponding dimension of `x` is
+        used.
+    axes : int or array_like of ints or None
+        Axes along which the calculation is computed.
+        The default is over all axes.
+        Negative indices are automatically converted to their positive
+        counterparts.
+
+    Returns
+    -------
+    shape : tuple
+        The shape of the result as a tuple of integers.
+    axes : list
+        Axes along which the calculation is computed, as a list of integers.
+
+    """
+    x = np.asarray(x)
+    return _helper._init_nd_shape_and_axes(x, shape, axes)
+
+
+def fftfreq(n, d=1.0, *, xp=None, device=None):
+    """Return the Discrete Fourier Transform sample frequencies.
+
+    The returned float array `f` contains the frequency bin centers in cycles
+    per unit of the sample spacing (with zero at the start).  For instance, if
+    the sample spacing is in seconds, then the frequency unit is cycles/second.
+
+    Given a window length `n` and a sample spacing `d`::
+
+      f = [0, 1, ...,   n/2-1,     -n/2, ..., -1] / (d*n)   if n is even
+      f = [0, 1, ..., (n-1)/2, -(n-1)/2, ..., -1] / (d*n)   if n is odd
+
+    Parameters
+    ----------
+    n : int
+        Window length.
+    d : scalar, optional
+        Sample spacing (inverse of the sampling rate). Defaults to 1.
+    xp : array_namespace, optional
+        The namespace for the return array. Default is None, where NumPy is used.
+    device : device, optional
+        The device for the return array.
+        Only valid when `xp.fft.fftfreq` implements the device parameter.
+     
+    Returns
+    -------
+    f : ndarray
+        Array of length `n` containing the sample frequencies.
+
+    Examples
+    --------
+    >>> import numpy as np
+    >>> import scipy.fft
+    >>> signal = np.array([-2, 8, 6, 4, 1, 0, 3, 5], dtype=float)
+    >>> fourier = scipy.fft.fft(signal)
+    >>> n = signal.size
+    >>> timestep = 0.1
+    >>> freq = scipy.fft.fftfreq(n, d=timestep)
+    >>> freq
+    array([ 0.  ,  1.25,  2.5 , ..., -3.75, -2.5 , -1.25])
+
+    """
+    xp = np if xp is None else xp
+    # numpy does not yet support the `device` keyword
+    # `xp.__name__ != 'numpy'` should be removed when numpy is compatible
+    if hasattr(xp, 'fft') and xp.__name__ != 'numpy':
+        return xp.fft.fftfreq(n, d=d, device=device)
+    if device is not None:
+        raise ValueError('device parameter is not supported for input array type')
+    return np.fft.fftfreq(n, d=d)
+
+
+def rfftfreq(n, d=1.0, *, xp=None, device=None):
+    """Return the Discrete Fourier Transform sample frequencies
+    (for usage with rfft, irfft).
+
+    The returned float array `f` contains the frequency bin centers in cycles
+    per unit of the sample spacing (with zero at the start).  For instance, if
+    the sample spacing is in seconds, then the frequency unit is cycles/second.
+
+    Given a window length `n` and a sample spacing `d`::
+
+      f = [0, 1, ...,     n/2-1,     n/2] / (d*n)   if n is even
+      f = [0, 1, ..., (n-1)/2-1, (n-1)/2] / (d*n)   if n is odd
+
+    Unlike `fftfreq` (but like `scipy.fftpack.rfftfreq`)
+    the Nyquist frequency component is considered to be positive.
+
+    Parameters
+    ----------
+    n : int
+        Window length.
+    d : scalar, optional
+        Sample spacing (inverse of the sampling rate). Defaults to 1.
+    xp : array_namespace, optional
+        The namespace for the return array. Default is None, where NumPy is used.
+    device : device, optional
+        The device for the return array.
+        Only valid when `xp.fft.rfftfreq` implements the device parameter.
+
+    Returns
+    -------
+    f : ndarray
+        Array of length ``n//2 + 1`` containing the sample frequencies.
+
+    Examples
+    --------
+    >>> import numpy as np
+    >>> import scipy.fft
+    >>> signal = np.array([-2, 8, 6, 4, 1, 0, 3, 5, -3, 4], dtype=float)
+    >>> fourier = scipy.fft.rfft(signal)
+    >>> n = signal.size
+    >>> sample_rate = 100
+    >>> freq = scipy.fft.fftfreq(n, d=1./sample_rate)
+    >>> freq
+    array([  0.,  10.,  20., ..., -30., -20., -10.])
+    >>> freq = scipy.fft.rfftfreq(n, d=1./sample_rate)
+    >>> freq
+    array([  0.,  10.,  20.,  30.,  40.,  50.])
+
+    """
+    xp = np if xp is None else xp
+    # numpy does not yet support the `device` keyword
+    # `xp.__name__ != 'numpy'` should be removed when numpy is compatible
+    if hasattr(xp, 'fft') and xp.__name__ != 'numpy':
+        return xp.fft.rfftfreq(n, d=d, device=device)
+    if device is not None:
+        raise ValueError('device parameter is not supported for input array type')
+    return np.fft.rfftfreq(n, d=d)
+
+
+def fftshift(x, axes=None):
+    """Shift the zero-frequency component to the center of the spectrum.
+
+    This function swaps half-spaces for all axes listed (defaults to all).
+    Note that ``y[0]`` is the Nyquist component only if ``len(x)`` is even.
+
+    Parameters
+    ----------
+    x : array_like
+        Input array.
+    axes : int or shape tuple, optional
+        Axes over which to shift.  Default is None, which shifts all axes.
+
+    Returns
+    -------
+    y : ndarray
+        The shifted array.
+
+    See Also
+    --------
+    ifftshift : The inverse of `fftshift`.
+
+    Examples
+    --------
+    >>> import numpy as np
+    >>> freqs = np.fft.fftfreq(10, 0.1)
+    >>> freqs
+    array([ 0.,  1.,  2., ..., -3., -2., -1.])
+    >>> np.fft.fftshift(freqs)
+    array([-5., -4., -3., -2., -1.,  0.,  1.,  2.,  3.,  4.])
+
+    Shift the zero-frequency component only along the second axis:
+
+    >>> freqs = np.fft.fftfreq(9, d=1./9).reshape(3, 3)
+    >>> freqs
+    array([[ 0.,  1.,  2.],
+           [ 3.,  4., -4.],
+           [-3., -2., -1.]])
+    >>> np.fft.fftshift(freqs, axes=(1,))
+    array([[ 2.,  0.,  1.],
+           [-4.,  3.,  4.],
+           [-1., -3., -2.]])
+
+    """
+    xp = array_namespace(x)
+    if hasattr(xp, 'fft'):
+        return xp.fft.fftshift(x, axes=axes)
+    x = np.asarray(x)
+    y = np.fft.fftshift(x, axes=axes)
+    return xp.asarray(y)
+
+
+def ifftshift(x, axes=None):
+    """The inverse of `fftshift`. Although identical for even-length `x`, the
+    functions differ by one sample for odd-length `x`.
+
+    Parameters
+    ----------
+    x : array_like
+        Input array.
+    axes : int or shape tuple, optional
+        Axes over which to calculate.  Defaults to None, which shifts all axes.
+
+    Returns
+    -------
+    y : ndarray
+        The shifted array.
+
+    See Also
+    --------
+    fftshift : Shift zero-frequency component to the center of the spectrum.
+
+    Examples
+    --------
+    >>> import numpy as np
+    >>> freqs = np.fft.fftfreq(9, d=1./9).reshape(3, 3)
+    >>> freqs
+    array([[ 0.,  1.,  2.],
+           [ 3.,  4., -4.],
+           [-3., -2., -1.]])
+    >>> np.fft.ifftshift(np.fft.fftshift(freqs))
+    array([[ 0.,  1.,  2.],
+           [ 3.,  4., -4.],
+           [-3., -2., -1.]])
+
+    """
+    xp = array_namespace(x)
+    if hasattr(xp, 'fft'):
+        return xp.fft.ifftshift(x, axes=axes)
+    x = np.asarray(x)
+    y = np.fft.ifftshift(x, axes=axes)
+    return xp.asarray(y)

parrot/lib/python3.10/site-packages/scipy/fft/_pocketfft/LICENSE.md

@@ -0,0 +1,25 @@
+Copyright (C) 2010-2019 Max-Planck-Society
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+* Redistributions in binary form must reproduce the above copyright notice, this
+  list of conditions and the following disclaimer in the documentation and/or
+  other materials provided with the distribution.
+* Neither the name of the copyright holder nor the names of its contributors may
+  be used to endorse or promote products derived from this software without
+  specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

parrot/lib/python3.10/site-packages/scipy/fft/_realtransforms.py

@@ -0,0 +1,693 @@
+from ._basic import _dispatch
+from scipy._lib.uarray import Dispatchable
+import numpy as np
+
+__all__ = ['dct', 'idct', 'dst', 'idst', 'dctn', 'idctn', 'dstn', 'idstn']
+
+
+@_dispatch
+def dctn(x, type=2, s=None, axes=None, norm=None, overwrite_x=False,
+         workers=None, *, orthogonalize=None):
+    """
+    Return multidimensional Discrete Cosine Transform along the specified axes.
+
+    Parameters
+    ----------
+    x : array_like
+        The input array.
+    type : {1, 2, 3, 4}, optional
+        Type of the DCT (see Notes). Default type is 2.
+    s : int or array_like of ints or None, optional
+        The shape of the result. If both `s` and `axes` (see below) are None,
+        `s` is ``x.shape``; if `s` is None but `axes` is not None, then `s` is
+        ``numpy.take(x.shape, axes, axis=0)``.
+        If ``s[i] > x.shape[i]``, the ith dimension of the input is padded with zeros.
+        If ``s[i] < x.shape[i]``, the ith dimension of the input is truncated to length
+        ``s[i]``.
+        If any element of `s` is -1, the size of the corresponding dimension of
+        `x` is used.
+    axes : int or array_like of ints or None, optional
+        Axes over which the DCT is computed. If not given, the last ``len(s)``
+        axes are used, or all axes if `s` is also not specified.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see Notes). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    orthogonalize : bool, optional
+        Whether to use the orthogonalized DCT variant (see Notes).
+        Defaults to ``True`` when ``norm="ortho"`` and ``False`` otherwise.
+
+        .. versionadded:: 1.8.0
+
+    Returns
+    -------
+    y : ndarray of real
+        The transformed input array.
+
+    See Also
+    --------
+    idctn : Inverse multidimensional DCT
+
+    Notes
+    -----
+    For full details of the DCT types and normalization modes, as well as
+    references, see `dct`.
+
+    Examples
+    --------
+    >>> import numpy as np
+    >>> from scipy.fft import dctn, idctn
+    >>> rng = np.random.default_rng()
+    >>> y = rng.standard_normal((16, 16))
+    >>> np.allclose(y, idctn(dctn(y)))
+    True
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def idctn(x, type=2, s=None, axes=None, norm=None, overwrite_x=False,
+          workers=None, orthogonalize=None):
+    """
+    Return multidimensional Inverse Discrete Cosine Transform along the specified axes.
+
+    Parameters
+    ----------
+    x : array_like
+        The input array.
+    type : {1, 2, 3, 4}, optional
+        Type of the DCT (see Notes). Default type is 2.
+    s : int or array_like of ints or None, optional
+        The shape of the result.  If both `s` and `axes` (see below) are
+        None, `s` is ``x.shape``; if `s` is None but `axes` is
+        not None, then `s` is ``numpy.take(x.shape, axes, axis=0)``.
+        If ``s[i] > x.shape[i]``, the ith dimension of the input is padded with zeros.
+        If ``s[i] < x.shape[i]``, the ith dimension of the input is truncated to length
+        ``s[i]``.
+        If any element of `s` is -1, the size of the corresponding dimension of
+        `x` is used.
+    axes : int or array_like of ints or None, optional
+        Axes over which the IDCT is computed. If not given, the last ``len(s)``
+        axes are used, or all axes if `s` is also not specified.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see Notes). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    orthogonalize : bool, optional
+        Whether to use the orthogonalized IDCT variant (see Notes).
+        Defaults to ``True`` when ``norm="ortho"`` and ``False`` otherwise.
+
+        .. versionadded:: 1.8.0
+
+    Returns
+    -------
+    y : ndarray of real
+        The transformed input array.
+
+    See Also
+    --------
+    dctn : multidimensional DCT
+
+    Notes
+    -----
+    For full details of the IDCT types and normalization modes, as well as
+    references, see `idct`.
+
+    Examples
+    --------
+    >>> import numpy as np
+    >>> from scipy.fft import dctn, idctn
+    >>> rng = np.random.default_rng()
+    >>> y = rng.standard_normal((16, 16))
+    >>> np.allclose(y, idctn(dctn(y)))
+    True
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def dstn(x, type=2, s=None, axes=None, norm=None, overwrite_x=False,
+         workers=None, orthogonalize=None):
+    """
+    Return multidimensional Discrete Sine Transform along the specified axes.
+
+    Parameters
+    ----------
+    x : array_like
+        The input array.
+    type : {1, 2, 3, 4}, optional
+        Type of the DST (see Notes). Default type is 2.
+    s : int or array_like of ints or None, optional
+        The shape of the result.  If both `s` and `axes` (see below) are None,
+        `s` is ``x.shape``; if `s` is None but `axes` is not None, then `s` is
+        ``numpy.take(x.shape, axes, axis=0)``.
+        If ``s[i] > x.shape[i]``, the ith dimension of the input is padded with zeros.
+        If ``s[i] < x.shape[i]``, the ith dimension of the input is truncated to length
+        ``s[i]``.
+        If any element of `shape` is -1, the size of the corresponding dimension
+        of `x` is used.
+    axes : int or array_like of ints or None, optional
+        Axes over which the DST is computed. If not given, the last ``len(s)``
+        axes are used, or all axes if `s` is also not specified.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see Notes). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    orthogonalize : bool, optional
+        Whether to use the orthogonalized DST variant (see Notes).
+        Defaults to ``True`` when ``norm="ortho"`` and ``False`` otherwise.
+
+        .. versionadded:: 1.8.0
+
+    Returns
+    -------
+    y : ndarray of real
+        The transformed input array.
+
+    See Also
+    --------
+    idstn : Inverse multidimensional DST
+
+    Notes
+    -----
+    For full details of the DST types and normalization modes, as well as
+    references, see `dst`.
+
+    Examples
+    --------
+    >>> import numpy as np
+    >>> from scipy.fft import dstn, idstn
+    >>> rng = np.random.default_rng()
+    >>> y = rng.standard_normal((16, 16))
+    >>> np.allclose(y, idstn(dstn(y)))
+    True
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def idstn(x, type=2, s=None, axes=None, norm=None, overwrite_x=False,
+          workers=None, orthogonalize=None):
+    """
+    Return multidimensional Inverse Discrete Sine Transform along the specified axes.
+
+    Parameters
+    ----------
+    x : array_like
+        The input array.
+    type : {1, 2, 3, 4}, optional
+        Type of the DST (see Notes). Default type is 2.
+    s : int or array_like of ints or None, optional
+        The shape of the result.  If both `s` and `axes` (see below) are None,
+        `s` is ``x.shape``; if `s` is None but `axes` is not None, then `s` is
+        ``numpy.take(x.shape, axes, axis=0)``.
+        If ``s[i] > x.shape[i]``, the ith dimension of the input is padded with zeros.
+        If ``s[i] < x.shape[i]``, the ith dimension of the input is truncated to length
+        ``s[i]``.
+        If any element of `s` is -1, the size of the corresponding dimension of
+        `x` is used.
+    axes : int or array_like of ints or None, optional
+        Axes over which the IDST is computed. If not given, the last ``len(s)``
+        axes are used, or all axes if `s` is also not specified.
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see Notes). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    orthogonalize : bool, optional
+        Whether to use the orthogonalized IDST variant (see Notes).
+        Defaults to ``True`` when ``norm="ortho"`` and ``False`` otherwise.
+
+        .. versionadded:: 1.8.0
+
+    Returns
+    -------
+    y : ndarray of real
+        The transformed input array.
+
+    See Also
+    --------
+    dstn : multidimensional DST
+
+    Notes
+    -----
+    For full details of the IDST types and normalization modes, as well as
+    references, see `idst`.
+
+    Examples
+    --------
+    >>> import numpy as np
+    >>> from scipy.fft import dstn, idstn
+    >>> rng = np.random.default_rng()
+    >>> y = rng.standard_normal((16, 16))
+    >>> np.allclose(y, idstn(dstn(y)))
+    True
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def dct(x, type=2, n=None, axis=-1, norm=None, overwrite_x=False, workers=None,
+        orthogonalize=None):
+    r"""Return the Discrete Cosine Transform of arbitrary type sequence x.
+
+    Parameters
+    ----------
+    x : array_like
+        The input array.
+    type : {1, 2, 3, 4}, optional
+        Type of the DCT (see Notes). Default type is 2.
+    n : int, optional
+        Length of the transform.  If ``n < x.shape[axis]``, `x` is
+        truncated.  If ``n > x.shape[axis]``, `x` is zero-padded. The
+        default results in ``n = x.shape[axis]``.
+    axis : int, optional
+        Axis along which the dct is computed; the default is over the
+        last axis (i.e., ``axis=-1``).
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see Notes). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    orthogonalize : bool, optional
+        Whether to use the orthogonalized DCT variant (see Notes).
+        Defaults to ``True`` when ``norm="ortho"`` and ``False`` otherwise.
+
+        .. versionadded:: 1.8.0
+
+    Returns
+    -------
+    y : ndarray of real
+        The transformed input array.
+
+    See Also
+    --------
+    idct : Inverse DCT
+
+    Notes
+    -----
+    For a single dimension array ``x``, ``dct(x, norm='ortho')`` is equal to
+    MATLAB ``dct(x)``.
+
+    .. warning:: For ``type in {1, 2, 3}``, ``norm="ortho"`` breaks the direct
+                 correspondence with the direct Fourier transform. To recover
+                 it you must specify ``orthogonalize=False``.
+
+    For ``norm="ortho"`` both the `dct` and `idct` are scaled by the same
+    overall factor in both directions. By default, the transform is also
+    orthogonalized which for types 1, 2 and 3 means the transform definition is
+    modified to give orthogonality of the DCT matrix (see below).
+
+    For ``norm="backward"``, there is no scaling on `dct` and the `idct` is
+    scaled by ``1/N`` where ``N`` is the "logical" size of the DCT. For
+    ``norm="forward"`` the ``1/N`` normalization is applied to the forward
+    `dct` instead and the `idct` is unnormalized.
+
+    There are, theoretically, 8 types of the DCT, only the first 4 types are
+    implemented in SciPy.'The' DCT generally refers to DCT type 2, and 'the'
+    Inverse DCT generally refers to DCT type 3.
+
+    **Type I**
+
+    There are several definitions of the DCT-I; we use the following
+    (for ``norm="backward"``)
+
+    .. math::
+
+       y_k = x_0 + (-1)^k x_{N-1} + 2 \sum_{n=1}^{N-2} x_n \cos\left(
+       \frac{\pi k n}{N-1} \right)
+
+    If ``orthogonalize=True``, ``x[0]`` and ``x[N-1]`` are multiplied by a
+    scaling factor of :math:`\sqrt{2}`, and ``y[0]`` and ``y[N-1]`` are divided
+    by :math:`\sqrt{2}`. When combined with ``norm="ortho"``, this makes the
+    corresponding matrix of coefficients orthonormal (``O @ O.T = np.eye(N)``).
+
+    .. note::
+       The DCT-I is only supported for input size > 1.
+
+    **Type II**
+
+    There are several definitions of the DCT-II; we use the following
+    (for ``norm="backward"``)
+
+    .. math::
+
+       y_k = 2 \sum_{n=0}^{N-1} x_n \cos\left(\frac{\pi k(2n+1)}{2N} \right)
+
+    If ``orthogonalize=True``, ``y[0]`` is divided by :math:`\sqrt{2}` which,
+    when combined with ``norm="ortho"``, makes the corresponding matrix of
+    coefficients orthonormal (``O @ O.T = np.eye(N)``).
+
+    **Type III**
+
+    There are several definitions, we use the following (for
+    ``norm="backward"``)
+
+    .. math::
+
+       y_k = x_0 + 2 \sum_{n=1}^{N-1} x_n \cos\left(\frac{\pi(2k+1)n}{2N}\right)
+
+    If ``orthogonalize=True``, ``x[0]`` terms are multiplied by
+    :math:`\sqrt{2}` which, when combined with ``norm="ortho"``, makes the
+    corresponding matrix of coefficients orthonormal (``O @ O.T = np.eye(N)``).
+
+    The (unnormalized) DCT-III is the inverse of the (unnormalized) DCT-II, up
+    to a factor `2N`. The orthonormalized DCT-III is exactly the inverse of
+    the orthonormalized DCT-II.
+
+    **Type IV**
+
+    There are several definitions of the DCT-IV; we use the following
+    (for ``norm="backward"``)
+
+    .. math::
+
+       y_k = 2 \sum_{n=0}^{N-1} x_n \cos\left(\frac{\pi(2k+1)(2n+1)}{4N} \right)
+
+    ``orthogonalize`` has no effect here, as the DCT-IV matrix is already
+    orthogonal up to a scale factor of ``2N``.
+
+    References
+    ----------
+    .. [1] 'A Fast Cosine Transform in One and Two Dimensions', by J.
+           Makhoul, `IEEE Transactions on acoustics, speech and signal
+           processing` vol. 28(1), pp. 27-34,
+           :doi:`10.1109/TASSP.1980.1163351` (1980).
+    .. [2] Wikipedia, "Discrete cosine transform",
+           https://en.wikipedia.org/wiki/Discrete_cosine_transform
+
+    Examples
+    --------
+    The Type 1 DCT is equivalent to the FFT (though faster) for real,
+    even-symmetrical inputs. The output is also real and even-symmetrical.
+    Half of the FFT input is used to generate half of the FFT output:
+
+    >>> from scipy.fft import fft, dct
+    >>> import numpy as np
+    >>> fft(np.array([4., 3., 5., 10., 5., 3.])).real
+    array([ 30.,  -8.,   6.,  -2.,   6.,  -8.])
+    >>> dct(np.array([4., 3., 5., 10.]), 1)
+    array([ 30.,  -8.,   6.,  -2.])
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def idct(x, type=2, n=None, axis=-1, norm=None, overwrite_x=False,
+         workers=None, orthogonalize=None):
+    """
+    Return the Inverse Discrete Cosine Transform of an arbitrary type sequence.
+
+    Parameters
+    ----------
+    x : array_like
+        The input array.
+    type : {1, 2, 3, 4}, optional
+        Type of the DCT (see Notes). Default type is 2.
+    n : int, optional
+        Length of the transform.  If ``n < x.shape[axis]``, `x` is
+        truncated.  If ``n > x.shape[axis]``, `x` is zero-padded. The
+        default results in ``n = x.shape[axis]``.
+    axis : int, optional
+        Axis along which the idct is computed; the default is over the
+        last axis (i.e., ``axis=-1``).
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see Notes). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    orthogonalize : bool, optional
+        Whether to use the orthogonalized IDCT variant (see Notes).
+        Defaults to ``True`` when ``norm="ortho"`` and ``False`` otherwise.
+
+        .. versionadded:: 1.8.0
+
+    Returns
+    -------
+    idct : ndarray of real
+        The transformed input array.
+
+    See Also
+    --------
+    dct : Forward DCT
+
+    Notes
+    -----
+    For a single dimension array `x`, ``idct(x, norm='ortho')`` is equal to
+    MATLAB ``idct(x)``.
+
+    .. warning:: For ``type in {1, 2, 3}``, ``norm="ortho"`` breaks the direct
+                 correspondence with the inverse direct Fourier transform. To
+                 recover it you must specify ``orthogonalize=False``.
+
+    For ``norm="ortho"`` both the `dct` and `idct` are scaled by the same
+    overall factor in both directions. By default, the transform is also
+    orthogonalized which for types 1, 2 and 3 means the transform definition is
+    modified to give orthogonality of the IDCT matrix (see `dct` for the full
+    definitions).
+
+    'The' IDCT is the IDCT-II, which is the same as the normalized DCT-III.
+
+    The IDCT is equivalent to a normal DCT except for the normalization and
+    type. DCT type 1 and 4 are their own inverse and DCTs 2 and 3 are each
+    other's inverses.
+
+    Examples
+    --------
+    The Type 1 DCT is equivalent to the DFT for real, even-symmetrical
+    inputs. The output is also real and even-symmetrical. Half of the IFFT
+    input is used to generate half of the IFFT output:
+
+    >>> from scipy.fft import ifft, idct
+    >>> import numpy as np
+    >>> ifft(np.array([ 30.,  -8.,   6.,  -2.,   6.,  -8.])).real
+    array([  4.,   3.,   5.,  10.,   5.,   3.])
+    >>> idct(np.array([ 30.,  -8.,   6.,  -2.]), 1)
+    array([  4.,   3.,   5.,  10.])
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def dst(x, type=2, n=None, axis=-1, norm=None, overwrite_x=False, workers=None,
+        orthogonalize=None):
+    r"""
+    Return the Discrete Sine Transform of arbitrary type sequence x.
+
+    Parameters
+    ----------
+    x : array_like
+        The input array.
+    type : {1, 2, 3, 4}, optional
+        Type of the DST (see Notes). Default type is 2.
+    n : int, optional
+        Length of the transform. If ``n < x.shape[axis]``, `x` is
+        truncated.  If ``n > x.shape[axis]``, `x` is zero-padded. The
+        default results in ``n = x.shape[axis]``.
+    axis : int, optional
+        Axis along which the dst is computed; the default is over the
+        last axis (i.e., ``axis=-1``).
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see Notes). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    orthogonalize : bool, optional
+        Whether to use the orthogonalized DST variant (see Notes).
+        Defaults to ``True`` when ``norm="ortho"`` and ``False`` otherwise.
+
+        .. versionadded:: 1.8.0
+
+    Returns
+    -------
+    dst : ndarray of reals
+        The transformed input array.
+
+    See Also
+    --------
+    idst : Inverse DST
+
+    Notes
+    -----
+    .. warning:: For ``type in {2, 3}``, ``norm="ortho"`` breaks the direct
+                 correspondence with the direct Fourier transform. To recover
+                 it you must specify ``orthogonalize=False``.
+
+    For ``norm="ortho"`` both the `dst` and `idst` are scaled by the same
+    overall factor in both directions. By default, the transform is also
+    orthogonalized which for types 2 and 3 means the transform definition is
+    modified to give orthogonality of the DST matrix (see below).
+
+    For ``norm="backward"``, there is no scaling on the `dst` and the `idst` is
+    scaled by ``1/N`` where ``N`` is the "logical" size of the DST.
+
+    There are, theoretically, 8 types of the DST for different combinations of
+    even/odd boundary conditions and boundary off sets [1]_, only the first
+    4 types are implemented in SciPy.
+
+    **Type I**
+
+    There are several definitions of the DST-I; we use the following for
+    ``norm="backward"``. DST-I assumes the input is odd around :math:`n=-1` and
+    :math:`n=N`.
+
+    .. math::
+
+        y_k = 2 \sum_{n=0}^{N-1} x_n \sin\left(\frac{\pi(k+1)(n+1)}{N+1}\right)
+
+    Note that the DST-I is only supported for input size > 1.
+    The (unnormalized) DST-I is its own inverse, up to a factor :math:`2(N+1)`.
+    The orthonormalized DST-I is exactly its own inverse.
+
+    ``orthogonalize`` has no effect here, as the DST-I matrix is already
+    orthogonal up to a scale factor of ``2N``.
+
+    **Type II**
+
+    There are several definitions of the DST-II; we use the following for
+    ``norm="backward"``. DST-II assumes the input is odd around :math:`n=-1/2` and
+    :math:`n=N-1/2`; the output is odd around :math:`k=-1` and even around :math:`k=N-1`
+
+    .. math::
+
+        y_k = 2 \sum_{n=0}^{N-1} x_n \sin\left(\frac{\pi(k+1)(2n+1)}{2N}\right)
+
+    If ``orthogonalize=True``, ``y[-1]`` is divided :math:`\sqrt{2}` which, when
+    combined with ``norm="ortho"``, makes the corresponding matrix of
+    coefficients orthonormal (``O @ O.T = np.eye(N)``).
+
+    **Type III**
+
+    There are several definitions of the DST-III, we use the following (for
+    ``norm="backward"``). DST-III assumes the input is odd around :math:`n=-1` and
+    even around :math:`n=N-1`
+
+    .. math::
+
+        y_k = (-1)^k x_{N-1} + 2 \sum_{n=0}^{N-2} x_n \sin\left(
+        \frac{\pi(2k+1)(n+1)}{2N}\right)
+
+    If ``orthogonalize=True``, ``x[-1]`` is multiplied by :math:`\sqrt{2}`
+    which, when combined with ``norm="ortho"``, makes the corresponding matrix
+    of coefficients orthonormal (``O @ O.T = np.eye(N)``).
+
+    The (unnormalized) DST-III is the inverse of the (unnormalized) DST-II, up
+    to a factor :math:`2N`. The orthonormalized DST-III is exactly the inverse of the
+    orthonormalized DST-II.
+
+    **Type IV**
+
+    There are several definitions of the DST-IV, we use the following (for
+    ``norm="backward"``). DST-IV assumes the input is odd around :math:`n=-0.5` and
+    even around :math:`n=N-0.5`
+
+    .. math::
+
+        y_k = 2 \sum_{n=0}^{N-1} x_n \sin\left(\frac{\pi(2k+1)(2n+1)}{4N}\right)
+
+    ``orthogonalize`` has no effect here, as the DST-IV matrix is already
+    orthogonal up to a scale factor of ``2N``.
+
+    The (unnormalized) DST-IV is its own inverse, up to a factor :math:`2N`. The
+    orthonormalized DST-IV is exactly its own inverse.
+
+    References
+    ----------
+    .. [1] Wikipedia, "Discrete sine transform",
+           https://en.wikipedia.org/wiki/Discrete_sine_transform
+
+    """
+    return (Dispatchable(x, np.ndarray),)
+
+
+@_dispatch
+def idst(x, type=2, n=None, axis=-1, norm=None, overwrite_x=False,
+         workers=None, orthogonalize=None):
+    """
+    Return the Inverse Discrete Sine Transform of an arbitrary type sequence.
+
+    Parameters
+    ----------
+    x : array_like
+        The input array.
+    type : {1, 2, 3, 4}, optional
+        Type of the DST (see Notes). Default type is 2.
+    n : int, optional
+        Length of the transform. If ``n < x.shape[axis]``, `x` is
+        truncated.  If ``n > x.shape[axis]``, `x` is zero-padded. The
+        default results in ``n = x.shape[axis]``.
+    axis : int, optional
+        Axis along which the idst is computed; the default is over the
+        last axis (i.e., ``axis=-1``).
+    norm : {"backward", "ortho", "forward"}, optional
+        Normalization mode (see Notes). Default is "backward".
+    overwrite_x : bool, optional
+        If True, the contents of `x` can be destroyed; the default is False.
+    workers : int, optional
+        Maximum number of workers to use for parallel computation. If negative,
+        the value wraps around from ``os.cpu_count()``.
+        See :func:`~scipy.fft.fft` for more details.
+    orthogonalize : bool, optional
+        Whether to use the orthogonalized IDST variant (see Notes).
+        Defaults to ``True`` when ``norm="ortho"`` and ``False`` otherwise.
+
+        .. versionadded:: 1.8.0
+
+    Returns
+    -------
+    idst : ndarray of real
+        The transformed input array.
+
+    See Also
+    --------
+    dst : Forward DST
+
+    Notes
+    -----
+    .. warning:: For ``type in {2, 3}``, ``norm="ortho"`` breaks the direct
+                 correspondence with the inverse direct Fourier transform.
+
+    For ``norm="ortho"`` both the `dst` and `idst` are scaled by the same
+    overall factor in both directions. By default, the transform is also
+    orthogonalized which for types 2 and 3 means the transform definition is
+    modified to give orthogonality of the DST matrix (see `dst` for the full
+    definitions).
+
+    'The' IDST is the IDST-II, which is the same as the normalized DST-III.
+
+    The IDST is equivalent to a normal DST except for the normalization and
+    type. DST type 1 and 4 are their own inverse and DSTs 2 and 3 are each
+    other's inverses.
+
+    """
+    return (Dispatchable(x, np.ndarray),)

parrot/lib/python3.10/site-packages/scipy/fft/_realtransforms_backend.py

@@ -0,0 +1,63 @@
+from scipy._lib._array_api import array_namespace
+import numpy as np
+from . import _pocketfft
+
+__all__ = ['dct', 'idct', 'dst', 'idst', 'dctn', 'idctn', 'dstn', 'idstn']
+
+
+def _execute(pocketfft_func, x, type, s, axes, norm, 
+             overwrite_x, workers, orthogonalize):
+    xp = array_namespace(x)
+    x = np.asarray(x)
+    y = pocketfft_func(x, type, s, axes, norm,
+                       overwrite_x=overwrite_x, workers=workers,
+                       orthogonalize=orthogonalize)
+    return xp.asarray(y)
+
+
+def dctn(x, type=2, s=None, axes=None, norm=None,
+         overwrite_x=False, workers=None, *, orthogonalize=None):
+    return _execute(_pocketfft.dctn, x, type, s, axes, norm, 
+                    overwrite_x, workers, orthogonalize)
+
+
+def idctn(x, type=2, s=None, axes=None, norm=None,
+          overwrite_x=False, workers=None, *, orthogonalize=None):
+    return _execute(_pocketfft.idctn, x, type, s, axes, norm, 
+                    overwrite_x, workers, orthogonalize)
+
+
+def dstn(x, type=2, s=None, axes=None, norm=None,
+         overwrite_x=False, workers=None, orthogonalize=None):
+    return _execute(_pocketfft.dstn, x, type, s, axes, norm, 
+                    overwrite_x, workers, orthogonalize)
+
+
+def idstn(x, type=2, s=None, axes=None, norm=None,
+          overwrite_x=False, workers=None, *, orthogonalize=None):
+    return _execute(_pocketfft.idstn, x, type, s, axes, norm, 
+                    overwrite_x, workers, orthogonalize)
+
+
+def dct(x, type=2, n=None, axis=-1, norm=None,
+        overwrite_x=False, workers=None, orthogonalize=None):
+    return _execute(_pocketfft.dct, x, type, n, axis, norm, 
+                    overwrite_x, workers, orthogonalize)
+
+
+def idct(x, type=2, n=None, axis=-1, norm=None,
+         overwrite_x=False, workers=None, orthogonalize=None):
+    return _execute(_pocketfft.idct, x, type, n, axis, norm, 
+                    overwrite_x, workers, orthogonalize)
+
+
+def dst(x, type=2, n=None, axis=-1, norm=None,
+        overwrite_x=False, workers=None, orthogonalize=None):
+    return _execute(_pocketfft.dst, x, type, n, axis, norm, 
+                    overwrite_x, workers, orthogonalize)
+
+
+def idst(x, type=2, n=None, axis=-1, norm=None,
+         overwrite_x=False, workers=None, orthogonalize=None):
+    return _execute(_pocketfft.idst, x, type, n, axis, norm, 
+                    overwrite_x, workers, orthogonalize)

parrot/lib/python3.10/site-packages/scipy/fft/tests/mock_backend.py

@@ -0,0 +1,92 @@
+import numpy as np
+import scipy.fft
+
+class _MockFunction:
+    def __init__(self, return_value = None):
+        self.number_calls = 0
+        self.return_value = return_value
+        self.last_args = ([], {})
+
+    def __call__(self, *args, **kwargs):
+        self.number_calls += 1
+        self.last_args = (args, kwargs)
+        return self.return_value
+
+
+fft = _MockFunction(np.random.random(10))
+fft2 = _MockFunction(np.random.random(10))
+fftn = _MockFunction(np.random.random(10))
+
+ifft = _MockFunction(np.random.random(10))
+ifft2 = _MockFunction(np.random.random(10))
+ifftn = _MockFunction(np.random.random(10))
+
+rfft = _MockFunction(np.random.random(10))
+rfft2 = _MockFunction(np.random.random(10))
+rfftn = _MockFunction(np.random.random(10))
+
+irfft = _MockFunction(np.random.random(10))
+irfft2 = _MockFunction(np.random.random(10))
+irfftn = _MockFunction(np.random.random(10))
+
+hfft = _MockFunction(np.random.random(10))
+hfft2 = _MockFunction(np.random.random(10))
+hfftn = _MockFunction(np.random.random(10))
+
+ihfft = _MockFunction(np.random.random(10))
+ihfft2 = _MockFunction(np.random.random(10))
+ihfftn = _MockFunction(np.random.random(10))
+
+dct = _MockFunction(np.random.random(10))
+idct = _MockFunction(np.random.random(10))
+dctn = _MockFunction(np.random.random(10))
+idctn = _MockFunction(np.random.random(10))
+
+dst = _MockFunction(np.random.random(10))
+idst = _MockFunction(np.random.random(10))
+dstn = _MockFunction(np.random.random(10))
+idstn = _MockFunction(np.random.random(10))
+
+fht = _MockFunction(np.random.random(10))
+ifht = _MockFunction(np.random.random(10))
+
+
+__ua_domain__ = "numpy.scipy.fft"
+
+
+_implements = {
+    scipy.fft.fft: fft,
+    scipy.fft.fft2: fft2,
+    scipy.fft.fftn: fftn,
+    scipy.fft.ifft: ifft,
+    scipy.fft.ifft2: ifft2,
+    scipy.fft.ifftn: ifftn,
+    scipy.fft.rfft: rfft,
+    scipy.fft.rfft2: rfft2,
+    scipy.fft.rfftn: rfftn,
+    scipy.fft.irfft: irfft,
+    scipy.fft.irfft2: irfft2,
+    scipy.fft.irfftn: irfftn,
+    scipy.fft.hfft: hfft,
+    scipy.fft.hfft2: hfft2,
+    scipy.fft.hfftn: hfftn,
+    scipy.fft.ihfft: ihfft,
+    scipy.fft.ihfft2: ihfft2,
+    scipy.fft.ihfftn: ihfftn,
+    scipy.fft.dct: dct,
+    scipy.fft.idct: idct,
+    scipy.fft.dctn: dctn,
+    scipy.fft.idctn: idctn,
+    scipy.fft.dst: dst,
+    scipy.fft.idst: idst,
+    scipy.fft.dstn: dstn,
+    scipy.fft.idstn: idstn,
+    scipy.fft.fht: fht,
+    scipy.fft.ifht: ifht
+}
+
+
+def __ua_function__(method, args, kwargs):
+    fn = _implements.get(method)
+    return (fn(*args, **kwargs) if fn is not None
+            else NotImplemented)

parrot/lib/python3.10/site-packages/scipy/fft/tests/test_backend.py

@@ -0,0 +1,98 @@
+from functools import partial
+
+import numpy as np
+import scipy.fft
+from scipy.fft import _fftlog, _pocketfft, set_backend
+from scipy.fft.tests import mock_backend
+
+from numpy.testing import assert_allclose, assert_equal
+import pytest
+
+fnames = ('fft', 'fft2', 'fftn',
+          'ifft', 'ifft2', 'ifftn',
+          'rfft', 'rfft2', 'rfftn',
+          'irfft', 'irfft2', 'irfftn',
+          'dct', 'idct', 'dctn', 'idctn',
+          'dst', 'idst', 'dstn', 'idstn',
+          'fht', 'ifht')
+
+np_funcs = (np.fft.fft, np.fft.fft2, np.fft.fftn,
+            np.fft.ifft, np.fft.ifft2, np.fft.ifftn,
+            np.fft.rfft, np.fft.rfft2, np.fft.rfftn,
+            np.fft.irfft, np.fft.irfft2, np.fft.irfftn,
+            np.fft.hfft, _pocketfft.hfft2, _pocketfft.hfftn,  # np has no hfftn
+            np.fft.ihfft, _pocketfft.ihfft2, _pocketfft.ihfftn,
+            _pocketfft.dct, _pocketfft.idct, _pocketfft.dctn, _pocketfft.idctn,
+            _pocketfft.dst, _pocketfft.idst, _pocketfft.dstn, _pocketfft.idstn,
+            # must provide required kwargs for fht, ifht
+            partial(_fftlog.fht, dln=2, mu=0.5),
+            partial(_fftlog.ifht, dln=2, mu=0.5))
+
+funcs = (scipy.fft.fft, scipy.fft.fft2, scipy.fft.fftn,
+         scipy.fft.ifft, scipy.fft.ifft2, scipy.fft.ifftn,
+         scipy.fft.rfft, scipy.fft.rfft2, scipy.fft.rfftn,
+         scipy.fft.irfft, scipy.fft.irfft2, scipy.fft.irfftn,
+         scipy.fft.hfft, scipy.fft.hfft2, scipy.fft.hfftn,
+         scipy.fft.ihfft, scipy.fft.ihfft2, scipy.fft.ihfftn,
+         scipy.fft.dct, scipy.fft.idct, scipy.fft.dctn, scipy.fft.idctn,
+         scipy.fft.dst, scipy.fft.idst, scipy.fft.dstn, scipy.fft.idstn,
+         # must provide required kwargs for fht, ifht
+         partial(scipy.fft.fht, dln=2, mu=0.5),
+         partial(scipy.fft.ifht, dln=2, mu=0.5))
+
+mocks = (mock_backend.fft, mock_backend.fft2, mock_backend.fftn,
+         mock_backend.ifft, mock_backend.ifft2, mock_backend.ifftn,
+         mock_backend.rfft, mock_backend.rfft2, mock_backend.rfftn,
+         mock_backend.irfft, mock_backend.irfft2, mock_backend.irfftn,
+         mock_backend.hfft, mock_backend.hfft2, mock_backend.hfftn,
+         mock_backend.ihfft, mock_backend.ihfft2, mock_backend.ihfftn,
+         mock_backend.dct, mock_backend.idct,
+         mock_backend.dctn, mock_backend.idctn,
+         mock_backend.dst, mock_backend.idst,
+         mock_backend.dstn, mock_backend.idstn,
+         mock_backend.fht, mock_backend.ifht)
+
+
+@pytest.mark.parametrize("func, np_func, mock", zip(funcs, np_funcs, mocks))
+def test_backend_call(func, np_func, mock):
+    x = np.arange(20).reshape((10,2))
+    answer = np_func(x.astype(np.float64))
+    assert_allclose(func(x), answer, atol=1e-10)
+
+    with set_backend(mock_backend, only=True):
+        mock.number_calls = 0
+        y = func(x)
+        assert_equal(y, mock.return_value)
+        assert_equal(mock.number_calls, 1)
+
+    assert_allclose(func(x), answer, atol=1e-10)
+
+
+plan_funcs = (scipy.fft.fft, scipy.fft.fft2, scipy.fft.fftn,
+              scipy.fft.ifft, scipy.fft.ifft2, scipy.fft.ifftn,
+              scipy.fft.rfft, scipy.fft.rfft2, scipy.fft.rfftn,
+              scipy.fft.irfft, scipy.fft.irfft2, scipy.fft.irfftn,
+              scipy.fft.hfft, scipy.fft.hfft2, scipy.fft.hfftn,
+              scipy.fft.ihfft, scipy.fft.ihfft2, scipy.fft.ihfftn)
+
+plan_mocks = (mock_backend.fft, mock_backend.fft2, mock_backend.fftn,
+              mock_backend.ifft, mock_backend.ifft2, mock_backend.ifftn,
+              mock_backend.rfft, mock_backend.rfft2, mock_backend.rfftn,
+              mock_backend.irfft, mock_backend.irfft2, mock_backend.irfftn,
+              mock_backend.hfft, mock_backend.hfft2, mock_backend.hfftn,
+              mock_backend.ihfft, mock_backend.ihfft2, mock_backend.ihfftn)
+
+
+@pytest.mark.parametrize("func, mock", zip(plan_funcs, plan_mocks))
+def test_backend_plan(func, mock):
+    x = np.arange(20).reshape((10, 2))
+
+    with pytest.raises(NotImplementedError, match='precomputed plan'):
+        func(x, plan='foo')
+
+    with set_backend(mock_backend, only=True):
+        mock.number_calls = 0
+        y = func(x, plan='foo')
+        assert_equal(y, mock.return_value)
+        assert_equal(mock.number_calls, 1)
+        assert_equal(mock.last_args[1]['plan'], 'foo')

parrot/lib/python3.10/site-packages/scipy/fftpack/convolve.cpython-310-x86_64-linux-gnu.so

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+size 272968

parrot/lib/python3.10/site-packages/scipy/io/tests/data/test-44100Hz-le-1ch-4bytes-early-eof-no-data.wav

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parrot/lib/python3.10/site-packages/scipy/io/tests/data/test-48000Hz-2ch-64bit-float-le-wavex.wav

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parrot/lib/python3.10/site-packages/scipy/io/tests/data/test-8000Hz-le-3ch-5S-24bit-inconsistent.wav

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parrot/lib/python3.10/site-packages/scipy/io/tests/data/test-8000Hz-le-3ch-5S-36bit.wav

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parrot/lib/python3.10/site-packages/scipy/io/tests/data/test-8000Hz-le-3ch-5S-45bit.wav

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parrot/lib/python3.10/site-packages/scipy/io/tests/data/test-8000Hz-le-4ch-9S-12bit.wav

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+size 116

parrot/lib/python3.10/site-packages/scipy/spatial/qhull_src/COPYING.txt

@@ -0,0 +1,38 @@
+                    Qhull, Copyright (c) 1993-2019
+                    
+                            C.B. Barber
+                           Arlington, MA 
+                          
+                               and
+
+       The National Science and Technology Research Center for
+        Computation and Visualization of Geometric Structures
+                        (The Geometry Center)
+                       University of Minnesota
+
+                       email: qhull@qhull.org
+
+This software includes Qhull from C.B. Barber and The Geometry Center.  
+Qhull is copyrighted as noted above.  Qhull is free software and may 
+be obtained via http from www.qhull.org.  It may be freely copied, modified, 
+and redistributed under the following conditions:
+
+1. All copyright notices must remain intact in all files.
+
+2. A copy of this text file must be distributed along with any copies 
+   of Qhull that you redistribute; this includes copies that you have 
+   modified, or copies of programs or other software products that 
+   include Qhull.
+
+3. If you modify Qhull, you must include a notice giving the
+   name of the person performing the modification, the date of
+   modification, and the reason for such modification.
+
+4. When distributing modified versions of Qhull, or other software 
+   products that include Qhull, you must provide notice that the original 
+   source code may be obtained as noted above.
+
+5. There is no warranty or other guarantee of fitness for Qhull, it is 
+   provided solely "as is".  Bug reports or fixes may be sent to 
+   qhull_bug@qhull.org; the authors may or may not act on them as 
+   they desire.

parrot/lib/python3.10/site-packages/scipy/spatial/transform/__init__.py

@@ -0,0 +1,29 @@
+"""
+Spatial Transformations (:mod:`scipy.spatial.transform`)
+========================================================
+
+.. currentmodule:: scipy.spatial.transform
+
+This package implements various spatial transformations. For now,
+only rotations are supported.
+
+Rotations in 3 dimensions
+-------------------------
+.. autosummary::
+   :toctree: generated/
+
+   Rotation
+   Slerp
+   RotationSpline
+"""
+from ._rotation import Rotation, Slerp
+from ._rotation_spline import RotationSpline
+
+# Deprecated namespaces, to be removed in v2.0.0
+from . import rotation
+
+__all__ = ['Rotation', 'Slerp', 'RotationSpline']
+
+from scipy._lib._testutils import PytestTester
+test = PytestTester(__name__)
+del PytestTester