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Towards #26024
#### What does this implement/fix? Explain your changes.
Add array API support to `contingency_matrix`
#### Any other comments?
This PR would unblock adding array API compliance for the following:
- `adjusted_rand_score`
- `completeness_score`
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#### What does this implement/fix? Explain your changes.
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- Integrated the lists into the working code and updated the unit tests accordingly.
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Eliminates threading lock contention in RandomForest parallel prediction, providing significant performance improvements for multi-core systems.
## Problem
The previous implementation used a single `threading.Lock()` for all prediction accumulation. Every worker thread had to acquire this lock to ad... | {
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- Replace inf/nan with 0.0 for zero-weighted classes using np.where
- Add regression test test_compute_class_weight_balanced_zero_weighted_class
- Classes with zero total weight now correctly receive zero class_weight
When computing balanced class weight... | {
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Visualizes the best alpha: Adds a vertical line to the accuracy plot to visually highlight the optimal ccp_alpha.
Demonstrates automation: Adds a new section showing how to find the best ccp_alpha automatically using GridSearchCV. | {
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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
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## Description
Adds a comprehensive test case to ensure that `QuantileTransformer` correctly handles sparse matrix subsampling when `ignore_implicit_zeros=True` is set, particularly for the edge case where `column_subsample` could become zero and cause quantiles to c... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32632 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32632/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32632/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32632/events | https://github.com/scikit-learn/scikit-learn/pull/32632 | 3,579,262,557 | PR_kwDOAAzd1s6xC-9A | 32,632 | Add overlay_dx_score regression metric | {
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## Summary
This PR implements the `overlay_dx_score` regression metric, which measures visual alignment between predictions and actual values across multiple tolerance levels. This metric is particularly useful for time series forecasting evaluatio... | {
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This is very likely related to warnings being thread-unsafe in cp313t. Not sure this is worth doing something about it since it doesn't seem to happen that oft... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32629 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32629/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32629/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32629/events | https://github.com/scikit-learn/scikit-learn/pull/32629 | 3,578,044,896 | PR_kwDOAAzd1s6w_XhR | 32,629 | Bump the actions group with 5 updates | {
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| Package | From | To |
| --- | --- | --- |
| [actions/download-artifact](https://github.com/actions/download-artifact) | `5` | `6` |
| [scientific-python/action-towncrier-changelog](https://github.com/scientific-python/action-towncrier-changelog) | `1` | `2` |
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32628 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32628/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32628/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32628/events | https://github.com/scikit-learn/scikit-learn/pull/32628 | 3,577,745,317 | PR_kwDOAAzd1s6w-abj | 32,628 | Add test for KMeans with global_random_seed [all random seeds] | {
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The test ensures that:
When global_random_seed is set, the results are consistent across various random seeds.
Consistent clustering results are produced b... | {
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- Test Collection Failure | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32626 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32626/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32626/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32626/events | https://github.com/scikit-learn/scikit-learn/pull/32626 | 3,576,281,265 | PR_kwDOAAzd1s6w5zWp | 32,626 | FEA Add array API support to `coverage_error` | {
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Towards #26024
#### What does this implement/fix? Explain your changes.
Add array API support to `coverage_error`
#### Any other comments? | null | {
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Small follow-up from https://github.com/scikit-learn/scikit-learn/pull/32509#issuecomment-3455944984
#### What does this implement/fix? Explain your changes.
Changes the tag name for the new development setup section from `install_bleeding_edge` to the more descriptive `setup_development_... | {
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## Current Problem
When evaluating regression models, especially for time series forecasting, existing metrics (MAE, RMSE, R²) don't capture how well predictions align visually with actual values across different tolerance levels.
## Desired Workflow
```python
from sklear... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32620 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32620/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32620/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32620/events | https://github.com/scikit-learn/scikit-learn/pull/32620 | 3,573,926,535 | PR_kwDOAAzd1s6wx4zp | 32,620 | DOC add doc repo cleanup to release process | {
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cc @lesteve @jeremiedbb | {
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<!-- Example: Fixes #1234. See also #3456. -->
None - this is a new example
#### What does this implement/fix?
Adds a new example demonstrating basic ColumnTransformer usage with:
- Preprocessing numeric features with StandardScaler
- Encoding categorical features with OneHotEncoder
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<!--
🙌 Thanks for contributing a pull request!
👀 Please ensure you have taken a look at the c... | {
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🙌 Thanks for contributing a pull request!
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@lesteve
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### `scikit-learn` version and operating system
scikit-learn version: 1.5.2 (also affects 1.4.x)
Operating System: (e.g., macOS, Windows, Linux)
Python version: (e.g., 3.10)
### The... | null | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32613 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32613/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32613/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32613/events | https://github.com/scikit-learn/scikit-learn/pull/32613 | 3,571,285,137 | PR_kwDOAAzd1s6wpWdU | 32,613 | FEA Add array API support for `laplacian_kernel` | {
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Towards: https://github.com/scikit-learn/scikit-learn/issues/26024
**What does this implement/fix? Explain your changes:**
Add array API support for `sklearn.metrics.laplacian_kernel` | {
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} | Even if `scipy.optimize` does not support array API yet, we can probably work around it to perform the computation of the gradient using the input data array namespace and convert the gradient values to numpy prior to feeding them back to the solver at each iteration.
Assuming `n_samples >> n_features`, this is likely... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32610 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32610/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32610/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32610/events | https://github.com/scikit-learn/scikit-learn/pull/32610 | 3,569,389,946 | PR_kwDOAAzd1s6wjPn2 | 32,610 | MNT Remove scikit-image from test lock-file | {
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https://scikit-learn.org/1.4/tutorial/statistical_inference/unsupervised_learning.html#connectivity-constrained-clustering) | {
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More info: https://circleci.com/changelog/introducing-a-faster-checkout-option/?utm_medium=email&_hsmi=387462139&utm_content=387460229&utm_source=hs_email
cc @lesteve @lucyleeow | {
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} | ### Describe the bug
Trying to install scikit-learn using uv pip install scikit-learn. Python 3.14t
Got an error while building
### Steps/Code to Reproduce
Use python 3.14t
Run uv pip install scikit-learn
### Expected Results
scikit-learn successfully installed
### Actual Results
Got an error
FAILED: [code=1]... | {
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- Cleanup old numpy compat code. | {
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Similar to https://github.com/scikit-learn/scikit-learn/pull/32605
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Follow-up on https://github.com/scikit-learn/scikit-learn/pull/32555
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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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```
Wheels for linux systems will use the ``manylinux_2_28`` tag, which means
dropping support for redhat7/centos7, amazonlinux2, debian9, ubuntu18.04, and
other pre-glibc2.28 operat... | {
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#### Reference Issues/PRs
Noticed while reviewing #32540
#### What does this implement/fix? Explain your changes.
* Make classes API reference links
* Fix small typos
#### Any other comments?
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Added enhancement mentioned in issue 32109
#### What does this implement/fix? Explain your changes.
Added specific variable for the inner solver
#### Any other comments?
None
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Towards #26024
#### What does this implement/fix? Explain your changes.
Add array API support to `calinski_harabasz_score`
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first failing on October 23 [build log](https://github.com/scikit-learn/scikit-learn/actions/runs/18736923722/job/53445538260)
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This PR adds a new example demonstrating how to use `ColumnTransformer` with
`remainder='passthrough'` when working with Pandas DataFrames.
- New example: `examples/compose/plot_column_transformer_passthrough.py`
- Demonstrates scaling, encoding, and leaving one column untouched
- Updates `doc/mo... | {
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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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Let's see what setting the log level to WARNING does.
Noticed with @StefanieSenger and @DeaMariaLeon the o... | {
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**Changes**:
- Added [all random seeds] to the commit message markers table in the contributing guide with a link to issue #28959
- Added a Python code example showing how to write a test using the global_random_seed fixture in the parallelis... | {
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**Fixes #31599**
### What does this implement/fix? Explain your changes.
**Bug before this change**
`_MultimetricScorer.__call__` iterates over the scorers in `self._scorers` and forwards `sample_weight` to each scorer if appropriate.
Before this change, the code unconditionally ... | {
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Fixes #32204.
#### What does this implement/fix? Explain your changes.
This PR expands the "Regression criteria" subsection in `doc/modules/tree.rst` to document the `friedman_mse` criterion alongside the existing criteria (`squared_error`, Poisson deviance, and MAE).
Specifically:... | {
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## Description
According to the [documentation](https://scikit-learn.org/stable/modules/generated/sklearn.preprocessing.OneHotEncoder.html) `handle_unknown='warn'` in `OneHotEncoder` is supposed to behave identically to `handle_unknown='infrequent_if_exist'` (i.e., map unknown categories to the infre... | {
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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/32590 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32590/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32590/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32590/events | https://github.com/scikit-learn/scikit-learn/issues/32590 | 3,558,997,774 | I_kwDOAAzd1s7UIf8O | 32,590 | Add shrinkage support with `solver="svd"` in `LinearDiscriminantAnalysis` and `QuadraticDiscriminantAnalysis` | {
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Both Linear Discriminant Analysis (LDA) and Quadratic Discriminant Analysis (QDA) can be solved with the SVD solver. The SVD solver does not explicitly compute the covariance matrix, so covariance shrinkage is not supported when we set `solver="svd"`, as illustrated in the ... | null | {
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According to the [documentation](https://scikit-learn.org/stable/modules/generated/sklearn.preprocessing.OneHotEncoder.html), `handle_unknown='warn'` should behave like `handle_unknown='infrequent_if_exist'` (mapping unknown categories to the infrequent category) while emitting a warning.
However... | {
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None
#### What does this implement/fix? Explain your changes.
This PR removes a few instances of extra whitespace (two spaces instead of one) after periods in the documentation for `sklearn.covariance`. Specifically, it fixes these in the `doc/modules/covariance.rst` file.
#### Any oth... | {
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Fixes: https://github.com/scikit-learn/scikit-learn/issues/32585
#### What does this implement/fix? Explain your changes.
Fix the logic for the sub-sampling (only affect the case `ignore_implicit_zeros=True`)
Adds a non-regression test.
#### Any other comments?
While reviewin... | null | {
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Towards #26024
#### What does this implement/fix? Explain your changes.
Add array API support to `det_curve`
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`QuantileTransformer(ignore_implicit_zeros=True)` sub-sampling behavior is incorrect leading to very incorrect results for very sparse matrices and/or small sub-sample size.
More over, this behavior is "discontinous": see the example.
In those lines:
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The `AGENTS.md` file is used by all(?)/many AI tools. Often it contains instructions for AI tools about how to build the software or run tests. In this PR all that is added is some basic instructions about PR messages, including an instruction ... | {
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Initial numpy issue: https://github.com/numpy/numpy/issues/14685
That propagated to sklearn: https://github.com/scikit-learn/scikit-learn/issues/15733
#### What does this implement/fix? Explain your changes.
Remove the code that was ensuring an ascending array even if numpy wasn't re... | {
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The double-centered squared dissimilarity matrix is just $C\Delta C$, and the gram matrix $B$ is $-\frac{1}{2}$ times that result. Classical MDS performs eigendecomposition on this gram matrix.
However, the documentation states that eigendecomposition is perf... | {
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The PR originates from this comment from @ogrisel : https://github.com/scikit-learn/scikit-learn/pull/32100#pullrequestreview-3360550173
#### What does this implement/fix? Explain your changes.
I modified/parameterized a toy example test with multi-output target to run with every crit... | {
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It happens very often that new contributors open PRs on un-triaged issues and I figured we didn't have any information on that in the docs. | {
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- Documenting the commit message marker in the developer guide commit marker table. It instructs CI to run only the listed tests for all seeds by setting .
- Adding a short Python snippet in the parallelism docs showing how to use the fixture in a test.
Rationale:
- The marker is alread... | {
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**Changes:**
- Document that all native extensions are now marked as free-threading compatible
- Mention the dedicated continuous integration for thread safety testing
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The Geometric Mixture Classifier (GMC) enables interpretable, efficient classification on multimodal datasets where traditional linear models struggle. Many real-world classification problems involve classes that occupy multiple disjoint regions in feature space (e.g., medi... | {
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👀 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
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👀 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
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First draft towards extending the Automated Contributions Policy for PRs to require a disclosure of AI usage, as discussed towards the end of #31679
#### What does this implement/fix? Explain your changes.
Adds a paragraph on required disclosure of AI usage to the Automated Contributions... | {
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Related to [this comment](https://github.com/scikit-learn/scikit-learn/issues/32394#issuecomment-3375647854) in #32394
#### What does this implement/fix? Explain your changes.
Adds a more specific error message (and respective tests) for cases when an estimator class is passed instead of... | {
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- build_tools/check-meson-openmp-dependencies.py: Fixed "the the" to "the"
- sklearn/tests/test_base.py: Fixed "the the" to "the" in a comment
These are minor documentation fixes to improve clarity and readability.
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👀 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
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Looks like our .github.io is above the size quota and we probably need to squash the commits into one (hoping this is enough) as @adrinjalali did a while ago?
```
+ git push
Enumerating obj... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32561 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32561/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32561/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32561/events | https://github.com/scikit-learn/scikit-learn/issues/32561 | 3,547,748,553 | I_kwDOAAzd1s7TdljJ | 32,561 | DOC: Add user guide entry for sample weights | {
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> Note to potential contributors: this is not a good issue to work on, please don't comment "can I work on it" or you may be banned from the repo.
> There is NO action that needs to be taken for this issue atm - there are probably some questions around weights that need to be addressed first.
### Describ... | null | {
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I wonder whether the behavior of `QuadraticDiscriminatAnalysis` producing the Warning in the test below is as intended, or a problem to be fixed.
The test `test_qda_regularization` checks some of QDA's handling of rank deficient matrices. It starts by testing the class on data `X2` where the sec... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32559 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32559/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32559/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32559/events | https://github.com/scikit-learn/scikit-learn/pull/32559 | 3,545,895,038 | PR_kwDOAAzd1s6vVBN2 | 32,559 | Implementation of Machine Learning algorithms for testing | {
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I would like to propose an improvement to the documentation by adding a dedicated section that covers the time and space complexity ) of key scikit-learn algorithms, supported by practical performance benchmarks.
This Pull Request (PR) serves as the **first step**, providing the initial benchmark ... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32558 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32558/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32558/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32558/events | https://github.com/scikit-learn/scikit-learn/pull/32558 | 3,545,453,845 | PR_kwDOAAzd1s6vTicw | 32,558 | CI Disable `[all random seed marker]` detection outside pull-request | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32557 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32557/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32557/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32557/events | https://github.com/scikit-learn/scikit-learn/pull/32557 | 3,545,140,838 | PR_kwDOAAzd1s6vSkQF | 32,557 | MNT Add example dependencies to version bumping script | {
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If we target a release on December 1st, this is what the script says:
```
❯ python maint_tools/bump-dependencies-versions.p... | {
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Hello,
I create this ticket because I realized unexpected behaviour for Weighted MAPE when you weight for the real values and those values are 0.
By the formula:
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32555 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32555/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32555/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32555/events | https://github.com/scikit-learn/scikit-learn/pull/32555 | 3,544,669,898 | PR_kwDOAAzd1s6vQ9ex | 32,555 | MNT Bump to Python 3.11 for remaining pymin CI builds | {
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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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🙌 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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- Adds the `[all random seeds]` marker to the commit message markers table in `doc/developers/contributing.rst`, matching the concise style of existing markers.
- Adds a... | {
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In #32422 we have introduced array API for probabilistic metrics and added a test (test_probabilistic_metrics_multilabel_array_api).
I had this test failing locally with scipy==1.15.0 for `array-api-strict` arrays on `log_loss` and `2d_log_loss_score`, because [scipy's xlogy](https://docs.scipy.o... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32551 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32551/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32551/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32551/events | https://github.com/scikit-learn/scikit-learn/issues/32551 | 3,539,655,678 | I_kwDOAAzd1s7S-tv- | 32,551 | DOC all random seeds commit message | {
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I wanted to reference the [all random seeds] commit message in the developer guide, which is very useful when contributing a test depending on `global_random_seed`, but it isn't documented in https://scikit-learn.org/dev/developers/contributing.html#commit-message-mar... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32550 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32550/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32550/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32550/events | https://github.com/scikit-learn/scikit-learn/pull/32550 | 3,539,120,388 | PR_kwDOAAzd1s6u-rmq | 32,550 | MNT Remove tomli additional dependency from .pre-commit.yaml | {
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We are in the process of moving e.g. https://github.com/scikit-learn/scikit-learn/pull/32522 but I think it is fine to do ... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32549 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32549/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32549/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32549/events | https://github.com/scikit-learn/scikit-learn/pull/32549 | 3,537,799,706 | PR_kwDOAAzd1s6u6OQ3 | 32,549 | FIX classification metrics raise on empty input | {
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See https://github.com/scikit-learn/scikit-learn/pull/31187#discussion_r2077261040.
supersedes #31187
The following classification metrics use the module level helper function `_check_targets` (not `check_array`) which previo... | {
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This PR update the authors by running the `make authors` command from the `build_tools` director. Apparently, we forgot to run it recently. @StefanieSenger is moved to the right team now :) | {
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