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evalkit_cambrian/lib/python3.10/site-packages/gradio/node/dev/node_modules/esbuild-wasm/esbuild.wasm

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infer_4_47_1/lib/python3.10/site-packages/scipy/sparse/csgraph/__init__.py

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+r"""
+Compressed sparse graph routines (:mod:`scipy.sparse.csgraph`)
+==============================================================
+
+.. currentmodule:: scipy.sparse.csgraph
+
+Fast graph algorithms based on sparse matrix representations.
+
+Contents
+--------
+
+.. autosummary::
+   :toctree: generated/
+
+   connected_components -- determine connected components of a graph
+   laplacian -- compute the laplacian of a graph
+   shortest_path -- compute the shortest path between points on a positive graph
+   dijkstra -- use Dijkstra's algorithm for shortest path
+   floyd_warshall -- use the Floyd-Warshall algorithm for shortest path
+   bellman_ford -- use the Bellman-Ford algorithm for shortest path
+   johnson -- use Johnson's algorithm for shortest path
+   yen -- use Yen's algorithm for K-shortest paths between to nodes.
+   breadth_first_order -- compute a breadth-first order of nodes
+   depth_first_order -- compute a depth-first order of nodes
+   breadth_first_tree -- construct the breadth-first tree from a given node
+   depth_first_tree -- construct a depth-first tree from a given node
+   minimum_spanning_tree -- construct the minimum spanning tree of a graph
+   reverse_cuthill_mckee -- compute permutation for reverse Cuthill-McKee ordering
+   maximum_flow -- solve the maximum flow problem for a graph
+   maximum_bipartite_matching -- compute a maximum matching of a bipartite graph
+   min_weight_full_bipartite_matching - compute a minimum weight full matching of a bipartite graph
+   structural_rank -- compute the structural rank of a graph
+   NegativeCycleError
+
+.. autosummary::
+   :toctree: generated/
+
+   construct_dist_matrix
+   csgraph_from_dense
+   csgraph_from_masked
+   csgraph_masked_from_dense
+   csgraph_to_dense
+   csgraph_to_masked
+   reconstruct_path
+
+Graph Representations
+---------------------
+This module uses graphs which are stored in a matrix format. A
+graph with N nodes can be represented by an (N x N) adjacency matrix G.
+If there is a connection from node i to node j, then G[i, j] = w, where
+w is the weight of the connection. For nodes i and j which are
+not connected, the value depends on the representation:
+
+- for dense array representations, non-edges are represented by
+  G[i, j] = 0, infinity, or NaN.
+
+- for dense masked representations (of type np.ma.MaskedArray), non-edges
+  are represented by masked values. This can be useful when graphs with
+  zero-weight edges are desired.
+
+- for sparse array representations, non-edges are represented by
+  non-entries in the matrix. This sort of sparse representation also
+  allows for edges with zero weights.
+
+As a concrete example, imagine that you would like to represent the following
+undirected graph::
+
+              G
+
+             (0)
+            /   \
+           1     2
+          /       \
+        (2)       (1)
+
+This graph has three nodes, where node 0 and 1 are connected by an edge of
+weight 2, and nodes 0 and 2 are connected by an edge of weight 1.
+We can construct the dense, masked, and sparse representations as follows,
+keeping in mind that an undirected graph is represented by a symmetric matrix::
+
+    >>> import numpy as np
+    >>> G_dense = np.array([[0, 2, 1],
+    ...                     [2, 0, 0],
+    ...                     [1, 0, 0]])
+    >>> G_masked = np.ma.masked_values(G_dense, 0)
+    >>> from scipy.sparse import csr_array
+    >>> G_sparse = csr_array(G_dense)
+
+This becomes more difficult when zero edges are significant. For example,
+consider the situation when we slightly modify the above graph::
+
+             G2
+
+             (0)
+            /   \
+           0     2
+          /       \
+        (2)       (1)
+
+This is identical to the previous graph, except nodes 0 and 2 are connected
+by an edge of zero weight. In this case, the dense representation above
+leads to ambiguities: how can non-edges be represented if zero is a meaningful
+value? In this case, either a masked or sparse representation must be used
+to eliminate the ambiguity::
+
+    >>> import numpy as np
+    >>> G2_data = np.array([[np.inf, 2,      0     ],
+    ...                     [2,      np.inf, np.inf],
+    ...                     [0,      np.inf, np.inf]])
+    >>> G2_masked = np.ma.masked_invalid(G2_data)
+    >>> from scipy.sparse.csgraph import csgraph_from_dense
+    >>> # G2_sparse = csr_array(G2_data) would give the wrong result
+    >>> G2_sparse = csgraph_from_dense(G2_data, null_value=np.inf)
+    >>> G2_sparse.data
+    array([ 2.,  0.,  2.,  0.])
+
+Here we have used a utility routine from the csgraph submodule in order to
+convert the dense representation to a sparse representation which can be
+understood by the algorithms in submodule. By viewing the data array, we
+can see that the zero values are explicitly encoded in the graph.
+
+Directed vs. undirected
+^^^^^^^^^^^^^^^^^^^^^^^
+Matrices may represent either directed or undirected graphs. This is
+specified throughout the csgraph module by a boolean keyword. Graphs are
+assumed to be directed by default. In a directed graph, traversal from node
+i to node j can be accomplished over the edge G[i, j], but not the edge
+G[j, i].  Consider the following dense graph::
+
+    >>> import numpy as np
+    >>> G_dense = np.array([[0, 1, 0],
+    ...                     [2, 0, 3],
+    ...                     [0, 4, 0]])
+
+When ``directed=True`` we get the graph::
+
+      ---1--> ---3-->
+    (0)     (1)     (2)
+      <--2--- <--4---
+
+In a non-directed graph, traversal from node i to node j can be
+accomplished over either G[i, j] or G[j, i].  If both edges are not null,
+and the two have unequal weights, then the smaller of the two is used.
+
+So for the same graph, when ``directed=False`` we get the graph::
+
+    (0)--1--(1)--3--(2)
+
+Note that a symmetric matrix will represent an undirected graph, regardless
+of whether the 'directed' keyword is set to True or False. In this case,
+using ``directed=True`` generally leads to more efficient computation.
+
+The routines in this module accept as input either scipy.sparse representations
+(csr, csc, or lil format), masked representations, or dense representations
+with non-edges indicated by zeros, infinities, and NaN entries.
+"""  # noqa: E501
+
+__docformat__ = "restructuredtext en"
+
+__all__ = ['connected_components',
+           'laplacian',
+           'shortest_path',
+           'floyd_warshall',
+           'dijkstra',
+           'bellman_ford',
+           'johnson',
+           'yen',
+           'breadth_first_order',
+           'depth_first_order',
+           'breadth_first_tree',
+           'depth_first_tree',
+           'minimum_spanning_tree',
+           'reverse_cuthill_mckee',
+           'maximum_flow',
+           'maximum_bipartite_matching',
+           'min_weight_full_bipartite_matching',
+           'structural_rank',
+           'construct_dist_matrix',
+           'reconstruct_path',
+           'csgraph_masked_from_dense',
+           'csgraph_from_dense',
+           'csgraph_from_masked',
+           'csgraph_to_dense',
+           'csgraph_to_masked',
+           'NegativeCycleError']
+
+from ._laplacian import laplacian
+from ._shortest_path import (
+    shortest_path, floyd_warshall, dijkstra, bellman_ford, johnson, yen,
+    NegativeCycleError
+)
+from ._traversal import (
+    breadth_first_order, depth_first_order, breadth_first_tree,
+    depth_first_tree, connected_components
+)
+from ._min_spanning_tree import minimum_spanning_tree
+from ._flow import maximum_flow
+from ._matching import (
+    maximum_bipartite_matching, min_weight_full_bipartite_matching
+)
+from ._reordering import reverse_cuthill_mckee, structural_rank
+from ._tools import (
+    construct_dist_matrix, reconstruct_path, csgraph_from_dense,
+    csgraph_to_dense, csgraph_masked_from_dense, csgraph_from_masked,
+    csgraph_to_masked
+)
+
+from scipy._lib._testutils import PytestTester
+test = PytestTester(__name__)
+del PytestTester

infer_4_47_1/lib/python3.10/site-packages/scipy/sparse/csgraph/_flow.cpython-310-x86_64-linux-gnu.so

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infer_4_47_1/lib/python3.10/site-packages/scipy/sparse/csgraph/_laplacian.py

@@ -0,0 +1,563 @@
+"""
+Laplacian of a compressed-sparse graph
+"""
+
+import numpy as np
+from scipy.sparse import issparse
+from scipy.sparse.linalg import LinearOperator
+from scipy.sparse._sputils import convert_pydata_sparse_to_scipy, is_pydata_spmatrix
+
+
+###############################################################################
+# Graph laplacian
+def laplacian(
+    csgraph,
+    normed=False,
+    return_diag=False,
+    use_out_degree=False,
+    *,
+    copy=True,
+    form="array",
+    dtype=None,
+    symmetrized=False,
+):
+    """
+    Return the Laplacian of a directed graph.
+
+    Parameters
+    ----------
+    csgraph : array_like or sparse array or matrix, 2 dimensions
+        compressed-sparse graph, with shape (N, N).
+    normed : bool, optional
+        If True, then compute symmetrically normalized Laplacian.
+        Default: False.
+    return_diag : bool, optional
+        If True, then also return an array related to vertex degrees.
+        Default: False.
+    use_out_degree : bool, optional
+        If True, then use out-degree instead of in-degree.
+        This distinction matters only if the graph is asymmetric.
+        Default: False.
+    copy: bool, optional
+        If False, then change `csgraph` in place if possible,
+        avoiding doubling the memory use.
+        Default: True, for backward compatibility.
+    form: 'array', or 'function', or 'lo'
+        Determines the format of the output Laplacian:
+
+        * 'array' is a numpy array;
+        * 'function' is a pointer to evaluating the Laplacian-vector
+          or Laplacian-matrix product;
+        * 'lo' results in the format of the `LinearOperator`.
+
+        Choosing 'function' or 'lo' always avoids doubling
+        the memory use, ignoring `copy` value.
+        Default: 'array', for backward compatibility.
+    dtype: None or one of numeric numpy dtypes, optional
+        The dtype of the output. If ``dtype=None``, the dtype of the
+        output matches the dtype of the input csgraph, except for
+        the case ``normed=True`` and integer-like csgraph, where
+        the output dtype is 'float' allowing accurate normalization,
+        but dramatically increasing the memory use.
+        Default: None, for backward compatibility.
+    symmetrized: bool, optional
+        If True, then the output Laplacian is symmetric/Hermitian.
+        The symmetrization is done by ``csgraph + csgraph.T.conj``
+        without dividing by 2 to preserve integer dtypes if possible
+        prior to the construction of the Laplacian.
+        The symmetrization will increase the memory footprint of
+        sparse matrices unless the sparsity pattern is symmetric or
+        `form` is 'function' or 'lo'.
+        Default: False, for backward compatibility.
+
+    Returns
+    -------
+    lap : ndarray, or sparse array or matrix, or `LinearOperator`
+        The N x N Laplacian of csgraph. It will be a NumPy array (dense)
+        if the input was dense, or a sparse array otherwise, or
+        the format of a function or `LinearOperator` if
+        `form` equals 'function' or 'lo', respectively.
+    diag : ndarray, optional
+        The length-N main diagonal of the Laplacian matrix.
+        For the normalized Laplacian, this is the array of square roots
+        of vertex degrees or 1 if the degree is zero.
+
+    Notes
+    -----
+    The Laplacian matrix of a graph is sometimes referred to as the
+    "Kirchhoff matrix" or just the "Laplacian", and is useful in many
+    parts of spectral graph theory.
+    In particular, the eigen-decomposition of the Laplacian can give
+    insight into many properties of the graph, e.g.,
+    is commonly used for spectral data embedding and clustering.
+
+    The constructed Laplacian doubles the memory use if ``copy=True`` and
+    ``form="array"`` which is the default.
+    Choosing ``copy=False`` has no effect unless ``form="array"``
+    or the matrix is sparse in the ``coo`` format, or dense array, except
+    for the integer input with ``normed=True`` that forces the float output.
+
+    Sparse input is reformatted into ``coo`` if ``form="array"``,
+    which is the default.
+
+    If the input adjacency matrix is not symmetric, the Laplacian is
+    also non-symmetric unless ``symmetrized=True`` is used.
+
+    Diagonal entries of the input adjacency matrix are ignored and
+    replaced with zeros for the purpose of normalization where ``normed=True``.
+    The normalization uses the inverse square roots of row-sums of the input
+    adjacency matrix, and thus may fail if the row-sums contain
+    negative or complex with a non-zero imaginary part values.
+
+    The normalization is symmetric, making the normalized Laplacian also
+    symmetric if the input csgraph was symmetric.
+
+    References
+    ----------
+    .. [1] Laplacian matrix. https://en.wikipedia.org/wiki/Laplacian_matrix
+
+    Examples
+    --------
+    >>> import numpy as np
+    >>> from scipy.sparse import csgraph
+
+    Our first illustration is the symmetric graph
+
+    >>> G = np.arange(4) * np.arange(4)[:, np.newaxis]
+    >>> G
+    array([[0, 0, 0, 0],
+           [0, 1, 2, 3],
+           [0, 2, 4, 6],
+           [0, 3, 6, 9]])
+
+    and its symmetric Laplacian matrix
+
+    >>> csgraph.laplacian(G)
+    array([[ 0,  0,  0,  0],
+           [ 0,  5, -2, -3],
+           [ 0, -2,  8, -6],
+           [ 0, -3, -6,  9]])
+
+    The non-symmetric graph
+
+    >>> G = np.arange(9).reshape(3, 3)
+    >>> G
+    array([[0, 1, 2],
+           [3, 4, 5],
+           [6, 7, 8]])
+
+    has different row- and column sums, resulting in two varieties
+    of the Laplacian matrix, using an in-degree, which is the default
+
+    >>> L_in_degree = csgraph.laplacian(G)
+    >>> L_in_degree
+    array([[ 9, -1, -2],
+           [-3,  8, -5],
+           [-6, -7,  7]])
+
+    or alternatively an out-degree
+
+    >>> L_out_degree = csgraph.laplacian(G, use_out_degree=True)
+    >>> L_out_degree
+    array([[ 3, -1, -2],
+           [-3,  8, -5],
+           [-6, -7, 13]])
+
+    Constructing a symmetric Laplacian matrix, one can add the two as
+
+    >>> L_in_degree + L_out_degree.T
+    array([[ 12,  -4,  -8],
+            [ -4,  16, -12],
+            [ -8, -12,  20]])
+
+    or use the ``symmetrized=True`` option
+
+    >>> csgraph.laplacian(G, symmetrized=True)
+    array([[ 12,  -4,  -8],
+           [ -4,  16, -12],
+           [ -8, -12,  20]])
+
+    that is equivalent to symmetrizing the original graph
+
+    >>> csgraph.laplacian(G + G.T)
+    array([[ 12,  -4,  -8],
+           [ -4,  16, -12],
+           [ -8, -12,  20]])
+
+    The goal of normalization is to make the non-zero diagonal entries
+    of the Laplacian matrix to be all unit, also scaling off-diagonal
+    entries correspondingly. The normalization can be done manually, e.g.,
+
+    >>> G = np.array([[0, 1, 1], [1, 0, 1], [1, 1, 0]])
+    >>> L, d = csgraph.laplacian(G, return_diag=True)
+    >>> L
+    array([[ 2, -1, -1],
+           [-1,  2, -1],
+           [-1, -1,  2]])
+    >>> d
+    array([2, 2, 2])
+    >>> scaling = np.sqrt(d)
+    >>> scaling
+    array([1.41421356, 1.41421356, 1.41421356])
+    >>> (1/scaling)*L*(1/scaling)
+    array([[ 1. , -0.5, -0.5],
+           [-0.5,  1. , -0.5],
+           [-0.5, -0.5,  1. ]])
+
+    Or using ``normed=True`` option
+
+    >>> L, d = csgraph.laplacian(G, return_diag=True, normed=True)
+    >>> L
+    array([[ 1. , -0.5, -0.5],
+           [-0.5,  1. , -0.5],
+           [-0.5, -0.5,  1. ]])
+
+    which now instead of the diagonal returns the scaling coefficients
+
+    >>> d
+    array([1.41421356, 1.41421356, 1.41421356])
+
+    Zero scaling coefficients are substituted with 1s, where scaling
+    has thus no effect, e.g.,
+
+    >>> G = np.array([[0, 0, 0], [0, 0, 1], [0, 1, 0]])
+    >>> G
+    array([[0, 0, 0],
+           [0, 0, 1],
+           [0, 1, 0]])
+    >>> L, d = csgraph.laplacian(G, return_diag=True, normed=True)
+    >>> L
+    array([[ 0., -0., -0.],
+           [-0.,  1., -1.],
+           [-0., -1.,  1.]])
+    >>> d
+    array([1., 1., 1.])
+
+    Only the symmetric normalization is implemented, resulting
+    in a symmetric Laplacian matrix if and only if its graph is symmetric
+    and has all non-negative degrees, like in the examples above.
+
+    The output Laplacian matrix is by default a dense array or a sparse
+    array or matrix inferring its class, shape, format, and dtype from
+    the input graph matrix:
+
+    >>> G = np.array([[0, 1, 1], [1, 0, 1], [1, 1, 0]]).astype(np.float32)
+    >>> G
+    array([[0., 1., 1.],
+           [1., 0., 1.],
+           [1., 1., 0.]], dtype=float32)
+    >>> csgraph.laplacian(G)
+    array([[ 2., -1., -1.],
+           [-1.,  2., -1.],
+           [-1., -1.,  2.]], dtype=float32)
+
+    but can alternatively be generated matrix-free as a LinearOperator:
+
+    >>> L = csgraph.laplacian(G, form="lo")
+    >>> L
+    <3x3 _CustomLinearOperator with dtype=float32>
+    >>> L(np.eye(3))
+    array([[ 2., -1., -1.],
+           [-1.,  2., -1.],
+           [-1., -1.,  2.]])
+
+    or as a lambda-function:
+
+    >>> L = csgraph.laplacian(G, form="function")
+    >>> L
+    <function _laplace.<locals>.<lambda> at 0x0000012AE6F5A598>
+    >>> L(np.eye(3))
+    array([[ 2., -1., -1.],
+           [-1.,  2., -1.],
+           [-1., -1.,  2.]])
+
+    The Laplacian matrix is used for
+    spectral data clustering and embedding
+    as well as for spectral graph partitioning.
+    Our final example illustrates the latter
+    for a noisy directed linear graph.
+
+    >>> from scipy.sparse import diags_array, random_array
+    >>> from scipy.sparse.linalg import lobpcg
+
+    Create a directed linear graph with ``N=35`` vertices
+    using a sparse adjacency matrix ``G``:
+
+    >>> N = 35
+    >>> G = diags_array(np.ones(N - 1), offsets=1, format="csr")
+
+    Fix a random seed ``rng`` and add a random sparse noise to the graph ``G``:
+
+    >>> rng = np.random.default_rng()
+    >>> G += 1e-2 * random_array((N, N), density=0.1, rng=rng)
+
+    Set initial approximations for eigenvectors:
+
+    >>> X = rng.random((N, 2))
+
+    The constant vector of ones is always a trivial eigenvector
+    of the non-normalized Laplacian to be filtered out:
+
+    >>> Y = np.ones((N, 1))
+
+    Alternating (1) the sign of the graph weights allows determining
+    labels for spectral max- and min- cuts in a single loop.
+    Since the graph is undirected, the option ``symmetrized=True``
+    must be used in the construction of the Laplacian.
+    The option ``normed=True`` cannot be used in (2) for the negative weights
+    here as the symmetric normalization evaluates square roots.
+    The option ``form="lo"`` in (2) is matrix-free, i.e., guarantees
+    a fixed memory footprint and read-only access to the graph.
+    Calling the eigenvalue solver ``lobpcg`` (3) computes the Fiedler vector
+    that determines the labels as the signs of its components in (5).
+    Since the sign in an eigenvector is not deterministic and can flip,
+    we fix the sign of the first component to be always +1 in (4).
+
+    >>> for cut in ["max", "min"]:
+    ...     G = -G  # 1.
+    ...     L = csgraph.laplacian(G, symmetrized=True, form="lo")  # 2.
+    ...     _, eves = lobpcg(L, X, Y=Y, largest=False, tol=1e-2)  # 3.
+    ...     eves *= np.sign(eves[0, 0])  # 4.
+    ...     print(cut + "-cut labels:\\n", 1 * (eves[:, 0]>0))  # 5.
+    max-cut labels:
+    [1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1]
+    min-cut labels:
+    [1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
+
+    As anticipated for a (slightly noisy) linear graph,
+    the max-cut strips all the edges of the graph coloring all
+    odd vertices into one color and all even vertices into another one,
+    while the balanced min-cut partitions the graph
+    in the middle by deleting a single edge.
+    Both determined partitions are optimal.
+    """
+    is_pydata_sparse = is_pydata_spmatrix(csgraph)
+    if is_pydata_sparse:
+        pydata_sparse_cls = csgraph.__class__
+        csgraph = convert_pydata_sparse_to_scipy(csgraph)
+    if csgraph.ndim != 2 or csgraph.shape[0] != csgraph.shape[1]:
+        raise ValueError('csgraph must be a square matrix or array')
+
+    if normed and (
+        np.issubdtype(csgraph.dtype, np.signedinteger)
+        or np.issubdtype(csgraph.dtype, np.uint)
+    ):
+        csgraph = csgraph.astype(np.float64)
+
+    if form == "array":
+        create_lap = (
+            _laplacian_sparse if issparse(csgraph) else _laplacian_dense
+        )
+    else:
+        create_lap = (
+            _laplacian_sparse_flo
+            if issparse(csgraph)
+            else _laplacian_dense_flo
+        )
+
+    degree_axis = 1 if use_out_degree else 0
+
+    lap, d = create_lap(
+        csgraph,
+        normed=normed,
+        axis=degree_axis,
+        copy=copy,
+        form=form,
+        dtype=dtype,
+        symmetrized=symmetrized,
+    )
+    if is_pydata_sparse:
+        lap = pydata_sparse_cls.from_scipy_sparse(lap)
+    if return_diag:
+        return lap, d
+    return lap
+
+
+def _setdiag_dense(m, d):
+    step = len(d) + 1
+    m.flat[::step] = d
+
+
+def _laplace(m, d):
+    return lambda v: v * d[:, np.newaxis] - m @ v
+
+
+def _laplace_normed(m, d, nd):
+    laplace = _laplace(m, d)
+    return lambda v: nd[:, np.newaxis] * laplace(v * nd[:, np.newaxis])
+
+
+def _laplace_sym(m, d):
+    return (
+        lambda v: v * d[:, np.newaxis]
+        - m @ v
+        - np.transpose(np.conjugate(np.transpose(np.conjugate(v)) @ m))
+    )
+
+
+def _laplace_normed_sym(m, d, nd):
+    laplace_sym = _laplace_sym(m, d)
+    return lambda v: nd[:, np.newaxis] * laplace_sym(v * nd[:, np.newaxis])
+
+
+def _linearoperator(mv, shape, dtype):
+    return LinearOperator(matvec=mv, matmat=mv, shape=shape, dtype=dtype)
+
+
+def _laplacian_sparse_flo(graph, normed, axis, copy, form, dtype, symmetrized):
+    # The keyword argument `copy` is unused and has no effect here.
+    del copy
+
+    if dtype is None:
+        dtype = graph.dtype
+
+    graph_sum = np.asarray(graph.sum(axis=axis)).ravel()
+    graph_diagonal = graph.diagonal()
+    diag = graph_sum - graph_diagonal
+    if symmetrized:
+        graph_sum += np.asarray(graph.sum(axis=1 - axis)).ravel()
+        diag = graph_sum - graph_diagonal - graph_diagonal
+
+    if normed:
+        isolated_node_mask = diag == 0
+        w = np.where(isolated_node_mask, 1, np.sqrt(diag))
+        if symmetrized:
+            md = _laplace_normed_sym(graph, graph_sum, 1.0 / w)
+        else:
+            md = _laplace_normed(graph, graph_sum, 1.0 / w)
+        if form == "function":
+            return md, w.astype(dtype, copy=False)
+        elif form == "lo":
+            m = _linearoperator(md, shape=graph.shape, dtype=dtype)
+            return m, w.astype(dtype, copy=False)
+        else:
+            raise ValueError(f"Invalid form: {form!r}")
+    else:
+        if symmetrized:
+            md = _laplace_sym(graph, graph_sum)
+        else:
+            md = _laplace(graph, graph_sum)
+        if form == "function":
+            return md, diag.astype(dtype, copy=False)
+        elif form == "lo":
+            m = _linearoperator(md, shape=graph.shape, dtype=dtype)
+            return m, diag.astype(dtype, copy=False)
+        else:
+            raise ValueError(f"Invalid form: {form!r}")
+
+
+def _laplacian_sparse(graph, normed, axis, copy, form, dtype, symmetrized):
+    # The keyword argument `form` is unused and has no effect here.
+    del form
+
+    if dtype is None:
+        dtype = graph.dtype
+
+    needs_copy = False
+    if graph.format in ('lil', 'dok'):
+        m = graph.tocoo()
+    else:
+        m = graph
+        if copy:
+            needs_copy = True
+
+    if symmetrized:
+        m += m.T.conj()
+
+    w = np.asarray(m.sum(axis=axis)).ravel() - m.diagonal()
+    if normed:
+        m = m.tocoo(copy=needs_copy)
+        isolated_node_mask = (w == 0)
+        w = np.where(isolated_node_mask, 1, np.sqrt(w))
+        m.data /= w[m.row]
+        m.data /= w[m.col]
+        m.data *= -1
+        m.setdiag(1 - isolated_node_mask)
+    else:
+        if m.format == 'dia':
+            m = m.copy()
+        else:
+            m = m.tocoo(copy=needs_copy)
+        m.data *= -1
+        m.setdiag(w)
+
+    return m.astype(dtype, copy=False), w.astype(dtype)
+
+
+def _laplacian_dense_flo(graph, normed, axis, copy, form, dtype, symmetrized):
+
+    if copy:
+        m = np.array(graph)
+    else:
+        m = np.asarray(graph)
+
+    if dtype is None:
+        dtype = m.dtype
+
+    graph_sum = m.sum(axis=axis)
+    graph_diagonal = m.diagonal()
+    diag = graph_sum - graph_diagonal
+    if symmetrized:
+        graph_sum += m.sum(axis=1 - axis)
+        diag = graph_sum - graph_diagonal - graph_diagonal
+
+    if normed:
+        isolated_node_mask = diag == 0
+        w = np.where(isolated_node_mask, 1, np.sqrt(diag))
+        if symmetrized:
+            md = _laplace_normed_sym(m, graph_sum, 1.0 / w)
+        else:
+            md = _laplace_normed(m, graph_sum, 1.0 / w)
+        if form == "function":
+            return md, w.astype(dtype, copy=False)
+        elif form == "lo":
+            m = _linearoperator(md, shape=graph.shape, dtype=dtype)
+            return m, w.astype(dtype, copy=False)
+        else:
+            raise ValueError(f"Invalid form: {form!r}")
+    else:
+        if symmetrized:
+            md = _laplace_sym(m, graph_sum)
+        else:
+            md = _laplace(m, graph_sum)
+        if form == "function":
+            return md, diag.astype(dtype, copy=False)
+        elif form == "lo":
+            m = _linearoperator(md, shape=graph.shape, dtype=dtype)
+            return m, diag.astype(dtype, copy=False)
+        else:
+            raise ValueError(f"Invalid form: {form!r}")
+
+
+def _laplacian_dense(graph, normed, axis, copy, form, dtype, symmetrized):
+
+    if form != "array":
+        raise ValueError(f'{form!r} must be "array"')
+
+    if dtype is None:
+        dtype = graph.dtype
+
+    if copy:
+        m = np.array(graph)
+    else:
+        m = np.asarray(graph)
+
+    if dtype is None:
+        dtype = m.dtype
+
+    if symmetrized:
+        m += m.T.conj()
+    np.fill_diagonal(m, 0)
+    w = m.sum(axis=axis)
+    if normed:
+        isolated_node_mask = (w == 0)
+        w = np.where(isolated_node_mask, 1, np.sqrt(w))
+        m /= w
+        m /= w[:, np.newaxis]
+        m *= -1
+        _setdiag_dense(m, 1 - isolated_node_mask)
+    else:
+        m *= -1
+        _setdiag_dense(m, w)
+
+    return m.astype(dtype, copy=False), w.astype(dtype, copy=False)

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infer_4_47_1/lib/python3.10/site-packages/scipy/sparse/csgraph/_validation.py

@@ -0,0 +1,66 @@
+import numpy as np
+from scipy.sparse import issparse
+from scipy.sparse._sputils import convert_pydata_sparse_to_scipy
+from scipy.sparse.csgraph._tools import (
+    csgraph_to_dense, csgraph_from_dense,
+    csgraph_masked_from_dense, csgraph_from_masked
+)
+
+DTYPE = np.float64
+
+
+def validate_graph(csgraph, directed, dtype=DTYPE,
+                   csr_output=True, dense_output=True,
+                   copy_if_dense=False, copy_if_sparse=False,
+                   null_value_in=0, null_value_out=np.inf,
+                   infinity_null=True, nan_null=True):
+    """Routine for validation and conversion of csgraph inputs"""
+    if not (csr_output or dense_output):
+        raise ValueError("Internal: dense or csr output must be true")
+
+    accept_fv = [null_value_in]
+    if infinity_null:
+        accept_fv.append(np.inf)
+    if nan_null:
+        accept_fv.append(np.nan)
+    csgraph = convert_pydata_sparse_to_scipy(csgraph, accept_fv=accept_fv)
+
+    # if undirected and csc storage, then transposing in-place
+    # is quicker than later converting to csr.
+    if (not directed) and issparse(csgraph) and csgraph.format == "csc":
+        csgraph = csgraph.T
+
+    if issparse(csgraph):
+        if csr_output:
+            csgraph = csgraph.tocsr(copy=copy_if_sparse).astype(DTYPE, copy=False)
+        else:
+            csgraph = csgraph_to_dense(csgraph, null_value=null_value_out)
+    elif np.ma.isMaskedArray(csgraph):
+        if dense_output:
+            mask = csgraph.mask
+            csgraph = np.array(csgraph.data, dtype=DTYPE, copy=copy_if_dense)
+            csgraph[mask] = null_value_out
+        else:
+            csgraph = csgraph_from_masked(csgraph)
+    else:
+        if dense_output:
+            csgraph = csgraph_masked_from_dense(csgraph,
+                                                copy=copy_if_dense,
+                                                null_value=null_value_in,
+                                                nan_null=nan_null,
+                                                infinity_null=infinity_null)
+            mask = csgraph.mask
+            csgraph = np.asarray(csgraph.data, dtype=DTYPE)
+            csgraph[mask] = null_value_out
+        else:
+            csgraph = csgraph_from_dense(csgraph, null_value=null_value_in,
+                                         infinity_null=infinity_null,
+                                         nan_null=nan_null)
+
+    if csgraph.ndim != 2:
+        raise ValueError("compressed-sparse graph must be 2-D")
+
+    if csgraph.shape[0] != csgraph.shape[1]:
+        raise ValueError("compressed-sparse graph must be shape (N, N)")
+
+    return csgraph