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#### What does this implement/fix? Explain your changes.
* Adds links to glossary where relevant
* `y_true` docstring only talks about the binary case - specifically detail binary data and multiclass data requirements
* Fix typo multilabel -> multiclass
#### AI usage disclosure
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RANSACRegressor may call estimator.score on inlier subsets that lead to
non-finite scores (e.g. R² with fewer than two samples), resulting in
warnings and undefined score comparisons.
This PR skips iterations with non-finite scores and adds a regression
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Fixes #17181
## What does this implement/fix?
This PR clarifies the documentation for `Lasso.path()` to address the
confusion around the default `l1_ratio=0.5` parameter.
### Problem
The `Lasso.path()` method is inherited from `ElasticNet` and defaults to
`l1_ratio=0.5`. This ... | {
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Fixes #33034
#### What does this implement/fix? Explain your changes.
When using `KNeighborsClassifier` with `algorithm="brute"` and `p=1` (Manhattan distance), the code path utilizes `ArgKminClassMode`. Previously, `self.classes_` (which can contain strings) was passed directly to the `u... | null | {
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- Test Collection Failure
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compares StandardScaler and MinMaxScaler on a simple 2D synthetic dataset.
The example helps new users understand how feature scaling affects the
geometry of data, which is important for models such as KMeans, KNN,
and SVM.
Includes:
- Synt... | {
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> This is not a good first (or second) issue to contribute. If you are interested in contributing to scikit-learn please have a look at our [contributing doc](https://scikit-learn.org/dev/developers/contributing.html) and in particular the section [Issues for new contributors](https://scikit-learn.org/dev/... | null | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33044 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33044/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33044/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33044/events | https://github.com/scikit-learn/scikit-learn/issues/33044 | 3,800,697,921 | I_kwDOAAzd1s7iigxB | 33,044 | Degraded performance of `enet_path` due to #31882 | {
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I need to use a significantly tighter value of `tol` to get the same quality of convergence from `enet_path` since #31882.
The point of running `enet_path` with a large number of alphas $\alpha_1 > \cdots > \alpha_n$ is that the resulting betas $\beta_1, \cdots, \beta_n$ are very close together,... | {
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`partial_fit` for `RobustScaler`, `QuantileTransformer`, and likely others
### Describe your proposed solution
It seems like functionality for approximating quantiles using t-digest or something will do most of the heavy lifting.
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🙌 Thanks for contributing a pull request!
👀 Please ensure you have taken a look at the contribution guidelines:
https://github.com/scikit-learn/scikit-learn/blob/main/CONTRIBUTING.md
✅ In particular following the pull request checklist will increase the likelihood
of having maintainers review your PR:
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When calling confusion_matrix with non-empty y_true and y_pred but an empty
sample_weight array, the function crashes during internal processing.
This appears to be caused by inconsistent handling of empty sample_weight
compared to all-zero sample_weight, which currently raises a ValueError.
##... | {
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#### Reference Issues/PRs
Related to issue #32700.
Follow-up from PR #32708: While writing the PR #32708, I didn't anticipated that tree-related parameters will be validated before being passed down to trees (and it's where the deprecation warning is raised, and where the valu... | {
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When X and y are float32, the default cutoff value
cond = max(X.shape) * np.finfo(X.dtype).eps
is too small and causes LAPACK to treat the matrix as rank-deficient, producing incorrect coefficients for large problems.
This ch... | {
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] | open | false | [] | null | 0 | 2026-01-10T13:24:48 | 2026-01-10T13:24:57 | null | null | NONE | null | null | null | null | #### What does this implement/fix? Explain your changes.
This PR clarifies terminology in several group-based cross-validation splitters by replacing uses of “stratification” that actually refer to domain-specific grouping. It also adds an explicit note explaining that these splitters do not perform class-label stra... | null | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33036 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33036/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33036/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33036/events | https://github.com/scikit-learn/scikit-learn/pull/33036 | 3,799,516,489 | PR_kwDOAAzd1s68dlzv | 33,036 | DOC: Add example comparing StandardScaler and MinMaxScaler | {
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compares StandardScaler and MinMaxScaler on a simple 2D synthetic dataset.
The example helps new users understand how feature scaling affects the
geometry of data, which is important for models such as KMeans, KNN,
and SVM.
Includes:
- Synt... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33035 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33035/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33035/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33035/events | https://github.com/scikit-learn/scikit-learn/pull/33035 | 3,799,228,789 | PR_kwDOAAzd1s68crKX | 33,035 | DOC: Add references for Agglomerative Clustering | {
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documentation to improve theoretical background and usability.
Fixes #9756
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33034 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33034/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33034/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33034/events | https://github.com/scikit-learn/scikit-learn/issues/33034 | 3,798,564,117 | I_kwDOAAzd1s7iaX0V | 33,034 | `KNeighborsClassifier` fails on non-numeric labels with `ValueError` on certain parameters combination | {
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When used with `algorithm="brute"` (or `algorithm="auto"` and the heuristic suggests brute force) and `p = 1`, `KNeighborsClassifier.predict` crashes when y labels are non-integers.
Note that this only crashes for this specific param combination, and `p=2`, for example, works fine with non-intege... | null | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33033 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33033/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33033/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33033/events | https://github.com/scikit-learn/scikit-learn/issues/33033 | 3,798,440,098 | I_kwDOAAzd1s7iZ5ii | 33,033 | RFC Question global random seed testing | {
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- running tests locally with all random seeds (`SKLEARN_TESTS_GLOBAL_RANDOM_SEED="all"`)
- add a commit with message `[all random seeds]` just to trigger CI/CD to run with all s... | {
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} | ### Describe the bug
`LinearRegression` is wrong on `float32` with a large sample size (e.g. 500k rows) since sklearn 1.6.0. This is still the case on 1.8.0. See minimal repro below. The residual sum of squares is much larger than the solution found by `{scipy,numpy}.linalg.lstsq` on `float32`.
Using the minimal repr... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33031 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33031/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33031/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33031/events | https://github.com/scikit-learn/scikit-learn/pull/33031 | 3,797,895,678 | PR_kwDOAAzd1s68YU0o | 33,031 | FIX confusion_matrix handling of empty sample_weight | {
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array while y_true and y_pred are non-empty.
Previously, passing an empty sample_weight could lead to an internal error
during sparse matrix construction due to inconsistent array lengths.
This patch ensures that empty sample_weight is h... | {
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Fixes #33029.
Related: #15436, #32991
TLDR;
On recent SciPy versions, sparse **array** containers (`coo_array`, `csr_array`, etc.) can be **1-D** (shape `(n_samples,)`). However, In `_set_order`, when we convert sparse inputs to CSC the conversion fails for 1-D sparse arrays in SciPy ... | {
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On recent SciPy versions (e.g. SciPy 1.16.3 used in CI), sparse **array** containers (`coo_array`, `csr_array`, etc.) can be **1-D** (shape `(n_samples,)`). However, scikit-learn, `_set_order` assumes any sparse `y` can be converted to CSC/CSR and calls `y.asformat("csc")` when `order="F"`, but Sc... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33028 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33028/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33028/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33028/events | https://github.com/scikit-learn/scikit-learn/pull/33028 | 3,795,917,633 | PR_kwDOAAzd1s68RxSc | 33,028 | DEBUG torch incompatibility with np.sum and np.repeat (pure debug PR, will be closed soon) | {
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Specifically this discussion: https://github.com/scikit-learn/scikit-learn/pull/32909/changes#r2627102404
EDIT: It is a bug on main (https://github.com/scikit-learn/scikit-learn/pull/33028#issuecomment-3744167700) and does not only affect the mentione... | {
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🙌 Thanks for contributing a pull request!
👀 Please ensure you have taken a look at the contribution guidelines:
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✅ In particular following the pull request checklist will increase the likelihood
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## Key Findings
- **Node.js 24 requirement**: All updated actions now require Actions Runner v2.327.1+ for Node.js 2... | {
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This pull request clarifies and improves documentation related to Array API
support in scikit-learn.It adds a Towncrier documentation entry under
`doc/whats_new/upcoming_changes/array-api` to better explain expected behavior
and usage notes when working with Array API–compatible i... | {
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🙌 Thanks for contributing a pull request!
👀 Please ensure you have taken a look at the contribution guidelines:
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N/A
## What does this implement/fix? Explain your changes.
Fixed two typos where words were accidentally duplicated:
- Line 536 in `sklearn/metrics/_classification.py`: Changed "the the" to "the" in comment
- Line 430 in `sklearn/utils/_plotting.py`: Changed "of of" to "of" in docstring... | {
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I was running `pytest -k "array_api and array_api_strict"` after updating `main` to check things were working. This came up with a group of failures like
```
FAILED sklearn/metrics/tests/test_classification.py::test_probabilistic_metrics_array_api[array_api_st... | {
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🙌 Thanks for contributing a pull request!
👀 Please ensure you have taken a look at the contribution guidelines:
https://github.com/scikit-learn/scikit-learn/blob/main/CONTRIBUTING.md
✅ In particular following the pull request checklist will increase the likelihood
of having maintainers review your PR:
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Fixes #32459 and supersedes #32506
#### What does this implement/fix? Explain your changes.
This fixes numerical errors in the small alpha regime by refactoring the solve/decompose methods:
- solve now returns the leave-one-out errors `looe` and the primal coeffcient `coef` instead o... | {
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Towards #32961
#### What does this implement/fix? Explain your changes.
Only jobs that run on `main` or a release branch can update the cache, all other jobs try to use it. We don't want jobs triggered by forks to write to the cache.
The goal is to implement a cache that is shared be... | {
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Supercedes #32897 as it requires updates to conda lock files, which we generally prefer to perform internally.
#### What does this implement/fix? Explain your changes.
Removes the numpydoc upper bound constraint, as the bug was fixed in https://github.com/numpy/numpydoc/pull/622, whic... | {
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- test_logistic_cv_sparse[54-csr_matrix-saga]
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🙌 Thanks for contributing a pull request!
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https://github.com/scikit-learn/scikit-learn/blob/main/CONTRIBUTING.md
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None
#### What does this implement/fix? Explain your changes.
This PR updates the docstring for the `verbose` parameter to explicitly clarify its default value and behavior.
It provides a breakdown of the output levels inherited from `joblib`, specifically detailing what is printed at... | {
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Fixes #32946
Related to #32968
---
### What does this implement/fix? Explain your changes.
This PR updates the documentation of the `verbose` parameter for `GridSearchCV` and
`RandomizedSearchCV` to reflect the actual observed behavior.
The previous documentation described verb... | {
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This PR fixes the impurity decrease calculation for the friedman_mse criterion in scikit-learn tree models.
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clear explanatory comments describing the workflow and visualization.
The goal is to make the example easier to understand for beginners exploring
classical classification models.
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to avoid confusion when these docstrings are rendered in downstream libraries.
Fixes #32045 | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33005 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33005/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33005/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33005/events | https://github.com/scikit-learn/scikit-learn/issues/33005 | 3,782,701,163 | I_kwDOAAzd1s7hd3Br | 33,005 | HTML rendering of estimator parameters does not escape potential HTML tags | {
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} | ### Describe the bug
if the docstring of a paramter contains something that could be an HTML tag it may mess up the rendering of the HTML parameter doc string
We have a `t_r` attribute whose docstring contains a `<TR>` (linking to a glossary etry) which does not play well in the middle of an HTML table.
```rst
t_r :... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33004 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33004/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33004/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33004/events | https://github.com/scikit-learn/scikit-learn/pull/33004 | 3,781,826,159 | PR_kwDOAAzd1s67jODg | 33,004 | FIX Update 20newsgroups dataset URL to fix 403 error. The current Fig… | {
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Fixes #33002 - Updates the 20newsgroups dataset download URL to resolve 403 Forbidden errors.
## Changes
- Updated `ARCHIVE.url` in `sklearn/datasets/_twenty_newsgroups.py` from Figshare to MIT CSAIL mirror
- Verified checksum matches the expected value
- Tested download successfully completes
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} | Creating an estimator that is fully compliant and compatible with scikit-learn is quite difficult for people who aren't scikit-learn maintainers. As a result there are a lot of estimators out there that are kinda compatible but not quite. This isn't great for users of the scikit-learn ecosystem, it is annoying for deve... | null | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33002 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33002/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33002/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33002/events | https://github.com/scikit-learn/scikit-learn/issues/33002 | 3,781,647,086 | I_kwDOAAzd1s7hZ1ru | 33,002 | Downloading 20_newsgroups results in 403 error | {
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When trying to download the 20_newsgroups, I'm getting the following error:
```
File [~/miniconda3/lib/python3.13/urllib/request.py:613](http://localhost:8888/lab/tree/miniconda3/lib/python3.13/urllib/request.py#line=612), in HTTPDefaultErrorHandler.http_error_default(self, req, fp, code, msg, hd... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33000 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33000/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33000/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33000/events | https://github.com/scikit-learn/scikit-learn/issues/33000 | 3,781,138,903 | I_kwDOAAzd1s7hX5nX | 33,000 | Turn "Needs Triage" label red? | {
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We have recently added [Issues tagged “Needs Triage”]( https://scikit-learn.org/dev/developers/contributing.html#issues-tagged-needs-triage) to the developer guide, that ... | {
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### Note
If the CI tasks fail, create a new branch based on this PR and add the required fixes to that branch. | {
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N/A
#### What does this implement/fix? Explain your changes.
Issue: In the summary table [here](https://scikit-learn.org/stable/api/sklearn.linear_model.html#regressors-with-variable-selection), Sphinx autosummary truncates docstrings for `Lars` and `LassoLars` at "a.k.a." because it in... | {
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- Add validation in _pre_fit for all invalid string values
- Raise ValueError for non-'auto' strings with clear error message
- Add regression tests covering all scenarios (valid/invalid, check_input True/False)
Fixes issue where enet_path crashe... | {
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Update year in `COPYING` to 2026.
#### AI usage disclosure
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TLDR;
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32989 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32989/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32989/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32989/events | https://github.com/scikit-learn/scikit-learn/issues/32989 | 3,777,928,220 | I_kwDOAAzd1s7hLpwc | 32,989 | enet_path raises ValueError when check_input=False and precompute='auto' (default) | {
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When calling `linear_model.enet_path` with `check_input=False`, the function crashes if `precompute` is left at its default value of 'auto'.
**TL;DR**: This is because `_pre_fit` (which resolves 'auto' to a boolean) is skipped, but the subsequent solver selection logic does not handle the string '... | {
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While working on another scikit-learn PR (**#32368**), CI intermittently failed in `sklearn/linear_model/tests/test_coordinate_descent.py::test_enet_ols_consistency`.It came from a strict numerical ordering assertion on the squared error:
```python
assert se_enet <= se_ols <= 1e-20
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AI usage disclousre:
-Documentation (including examples) | {
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AI usage disclosure:
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👀 Please ensure you have taken a look at the contribution guidelines:
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✅ In particular following the pull request checklist will increase the likelihood
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🙌 Thanks for contributing a pull request!
👀 Please ensure you have taken a look at the contribution guidelines:
https://github.com/scikit-learn/scikit-learn/blob/main/CONTRIBUTING.md
✅ In particular following the pull request checklist will increase the likelihood
of having maintainers review your PR:
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| --- | --- | --- |
| [actions/checkout](https://github.com/actions/checkout) | `5` | `6` |
| [actions/download-artifact](https://github.com/actions/download-artifact) | `6` | `7` |
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AI usage disclosure:
- Documentation (including examples)
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🙌 Thanks for contributing a pull request!
👀 Please ensure you have taken a look at the contribution guidelines:
https://github.com/scikit-learn/scikit-learn/blob/main/CONTRIBUTING.md
✅ In particular following the pull request checklist will increase the likelihood
of having maintainers review your PR:
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32978 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32978/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32978/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32978/events | https://github.com/scikit-learn/scikit-learn/issues/32978 | 3,774,312,743 | I_kwDOAAzd1s7g93En | 32,978 | janitor module conflicts with sklearn cross_val_score | {
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} | ### Describe the bug
Importing janitor when using LeaveOneOut() with cross_val_score() causing warning.
### Steps/Code to Reproduce
```
from sklearn.model_selection import LeaveOneOut, KFold, cross_val_score
import janitor #cannot be used with cross_val_score since it causes warning
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32977 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32977/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32977/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32977/events | https://github.com/scikit-learn/scikit-learn/pull/32977 | 3,774,184,750 | PR_kwDOAAzd1s67LVSu | 32,977 | TEST: make _unique_np robust to NaN ordering | {
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by unique_values, including NaNs.
This PR adds a regression test to ensure that _unique_np removes NaN values
regardless of their position in the returned array, instead of assuming they
appear at the end.
No functional behavior is ... | {
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returned by unique operations.
In _unique_np, the current implementation assumes that NaN values appear
at the end of the uniques array, which is not guaranteed for Array API
compliant backends. This PR removes that assumption by explicitly
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Fixes Issue 30991 :
- Changed number of samples calculation to handle edge cases.
- Added a test case to validate changes | null | {
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#### AI usage disclosure
- [x] Documentation (including examples)
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None
#### What does this implement/fix? Explain your changes.
This is a tiny improvement, changing one line of code for the hessian product in `sklearn.linear_models._linear_loss::LinearModelLoss.gradient_hessian_product`.
#### AI usage disclosure
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What does this implement
The current documentation states that `dtype=integral` is required. However, the metrics actually support strings and discrete float values (e.g. 0.0, 1.0) without issues.
I removed the incorrect `dtype` restriction from the docstrings to match the actual behavior of the fu... | {
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Files updated:
* `doc/about.rst`
* `doc/developers/contributing.rst`
* `doc/developers/performance.rst` | {
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GridSearchCV and RandomizedSearchCV.
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### Note
If the CI tasks fail, create a new branch based on this PR and add the required fixes to that branch. | {
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### Note
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```
❯ curl https://figshare.com/ndownloader/files/5976078
<html>
<head><title>403 Forbidden</title></head>
<body>
<center><h1>403 Forbidden</h1></center>
</body>
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Fixes #32957
What does this implement/fix? Explain your changes.
This PR improves the clarity of the first SimpleImputer example in the docstrings found in sklearn/impute/_base.py.
As highlighted in issue #32957, the previous example was confusing because it performed a fit on one array but... | {
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Unable to find junit file. Please see link for details. | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32957 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32957/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32957/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32957/events | https://github.com/scikit-learn/scikit-learn/issues/32957 | 3,764,953,618 | I_kwDOAAzd1s7gaKIS | 32,957 | DOC: First example for SimpleImputer is unclear | {
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} | ### Describe the issue linked to the documentation
The first example for SimpleImputer in 7.4.2. Univariate feature imputation (https://scikit-learn.org/stable/modules/impute.html#univariate-feature-imputation) is bit unclear. While the imputation is done on an array mentioned in the beginning of the example, the tran... | {
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🙌 Thanks for contributing a pull request!
👀 Please ensure you have taken a look at the contribution guidelines:
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✅ In particular following the pull request checklist will increase the likelihood
of having maintainers review your PR:
... | null | {
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This is a draft PR to investigate a possible solution to the performance slowdown when letting OpenMP use too many threads on small to medium problems.
I found the following heuristic to work well on my Apple M4 CPU (4 performance cores and 6 efficiency cores). In particular, it makes the running te... | null | {
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I am not sure if this is a bug of pytest or not but since I might not be the onl... | {
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