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I guess I would still need to add a test checking that the coefficients are zero for the absent class. | {
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I took the Iris dataset with the well known issue that `y` is ordered with 3 classes so that if you use `cv=KFold(3)` you will get the issue that each training fold will have 2 of the 3 classes... | {
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Fix #32748 and #30832
Leftover from https://github.com/scikit-learn/scikit-learn/pull/32073#discussion_r2537432774.
#### What does this implement/fix? Explain your changes.
If a CV fold in `LogisticRegressionCV` has not all classes present, the result is more or less random (certain so... | {
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- more debug info to print opened PRs with autoclose label and then the number of PRs to close. This would allow to monitor the action before it can close its first PR https://github.com/scikit-learn/scikit-learn/pull/32743
- add `dry_run` variable to be able to set it to `False` and run the script loca... | {
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Fixes #32739.
#### What does this implement/fix? Explain your changes.
This patch deprecates the `n_jobs` parameter in `LogisticRegression` and `LogisticRegressionCV` by adding a documentation directive and emitting a `FutureWarning` when the parameter is used. The runtime behavior is pre... | {
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Fix typo term: -> :term: in docstrings, which seem to have been copy pasta'd to several related functions (probably by me some time ago :grimacing: )
#### What does this implement/fix? Explain your changes.
#### Any other comments?
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Pyrefly is roughly 25% faster than mypy in pre-commit (saving roughly 3 seconds).
It finds 116 errors, that are silenced using `# pyrefly ignore` comments (it has a `--su... | null | {
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🙌 Thanks for contributing a pull request!
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#### Reference Issues/PRs
Motivated by reading our PR template while opening a PR and wondering if it was a bit long. I think there is truth in the idea that the longer we make something, the less likely people are to read it.
Related #32566
#### What does this implement/fix? Explain your changes.
* Shortens ... | {
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Noticed while working on #32732
#### What does this implement/fix? Explain your changes.
* add links to the glossary for terms binary, multiclass, multilabel
* Minor update to `det_curve` to make it more consistent with `precision_recall_curve` and `roc_curve`
#### Any other com... | {
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Another approach for #31338 (which superseded #25639 - closes #25639)
closes #21391
#### What does this implement/fix? Explain your changes.
Uses the approach suggested by @jeremiedbb (https://github.com/scikit-learn/scikit-learn/pull/31338#issuecomment-3380468102) of using re-using `c... | null | {
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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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Add a simple benchmark script to compare vanilla scikit-learn `RandomForest` vs Intel-optimized `sklearnex`, and add a tiny smoke test. This is a draft PR to provide reproducible numbers and a safe starting point for discussion on histogram-based splitting and bagging ensembles.
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Relates to #27439.
#### What does this implement/fix? Explain your changes.
If right now, it is officially not public, let's remove it from the public API list.
#### Any other comments?
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Solves #27439 and #31290
#### What does this implement/fix? Explain your changes.
Deprecate passing `slice` objects as `indices` parameter in `_safe_indexing`.
#### Any other comments?
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> This is not a good first issue to contribute. Great if you are interested to contribute 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/deve... | {
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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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#### Reference Issues/PRs
This PR is targeting the Issue (#32675) regarding the addition of the attributes `explained_variance_ratio_x_` and `explained_variance_ratio_y_` for the `_PLS` models.
Fixes [#32675](https://github.com/scikit-learn/scikit-learn/issues/32675)
Fixes [#19896](https://github.com/scikit-... | null | {
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- Raise clear TypeError suggesting to use ClassName() instead of ClassName
- Add test to verify the improved error message
#### Reference Issues/PRs
Fixes #32719
#### What does this implement/fix? Explain your changes.
This PR improves th... | {
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N/A
#### What does this implement/fix? Explain your changes.
This PR adds a new test (`test_bincount`) to `sklearn/utils/tests/test_array_api.py`.
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While building a pipeline I forgot the parenthesis during a step creation in the pipeline. I'm really not proud to admit that it took me a while to realize the mistake that I've made. I thought that maybe the error message in this instance could be improved if you guys agree.
I feel like it's a ... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32718 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32718/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32718/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32718/events | https://github.com/scikit-learn/scikit-learn/issues/32718 | 3,628,669,500 | I_kwDOAAzd1s7YSRo8 | 32,718 | BUG: trees: `criterion="friedman_mse"` is buggy for multi-output | {
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The calculation implemented in `FriedmanMSE.proxy_impurity_improvement` is plain wrong for the multi-output case.
When reading the code, it's fairly obvious that outputs are mixed in a way that doesn't mathematically make sense.
**Note:** I open this issue just for the records, as `"friedman_mse... | {
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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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#### Reference Issues/PRs
closes #32680
#### What does this implement/fix? Explain your changes.
Thanks for your input on #32680 .
I've amended the [Issues for New Contributors](https://scikit-learn.org/dev/developers/contributing.html#issues-for-new-contributors) section to:
* recommend that people star... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32714 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32714/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32714/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32714/events | https://github.com/scikit-learn/scikit-learn/pull/32714 | 3,626,867,458 | PR_kwDOAAzd1s6zhfBx | 32,714 | TST: Add test for check_random_state message on string seed | {
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This PR adds a unit test that verifies that `check_random_state` raises a clear
and descriptive `ValueError` when passed a string seed.
### What does this implement?
- Added a dedicated test: `test_check_random_state_string_error_message`
- File: `sklearn/utils/tests/test_validation.py`
- The tes... | {
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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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I would like scikit-learn to support association rule mining by implementing the Apriori algorithm. This would allow users to efficiently find frequent itemsets and generate association rules directly within the scikit-learn framework, similar to other supervised and unsupe... | {
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What it adds
File: examples/cluster/plot_kmeans_shapes_dtypes.py | {
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- test_logistic_cv_sparse[86-csr_matrix-sag]
- test_logistic_cv_sparse[86-csr_matrix-saga]
- test_logistic_cv_spa... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32709 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32709/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32709/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32709/events | https://github.com/scikit-learn/scikit-learn/pull/32709 | 3,622,867,251 | PR_kwDOAAzd1s6zUH0e | 32,709 | DOC Fix swapped axes in linear model coefficient plots (Issue #32706) | {
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Fixes #32706.
#### What does this implement/fix? Explain your changes.
Corrected two instances where AGE and EXPERIENCE coefficients were plotted in the wrong order.
This aligns the scatter plots with the axis labels and fixes the inconsistency raised in Issue #32706.
This PR upd... | {
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Towards #32700 (deprecation before complete removal).
Fixes:
- #32707
- #32718
#### What does this implement/fix? Explain your changes.
- Remove class `FriedmanMSE(MSE)` in `sklearn/tree/_criterion.pyx`
- Deprecate `"friedman_mse"` for trees & forests (`if criterion="friedman_... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32707 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32707/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32707/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32707/events | https://github.com/scikit-learn/scikit-learn/issues/32707 | 3,621,844,598 | I_kwDOAAzd1s7X4PZ2 | 32,707 | BUG: tree/forest regressor: impurity decrease calculation is wrong for criterion "friedman_mse" | {
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} | ### Describe the bug
Well, everything is in the title.
I noticed that while writing the issue #32700
I'm opening this issue just for the records, as we plan to remove `"friedman_mse"` criterion anyway.
### Steps/Code to Reproduce
```Python
import numpy as np
from sklearn.tree import DecisionTreeRegressor
X = np.... | {
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## Common pitfalls in the interpretation of coefficients of linear models
In line 396, `plt.scatter(coefs["AGE"], coefs["EXPERIENCE"])`, the Experience variable should be on x-axis if it were to follow the labelling in Line 392 `plt.xlabel("Experience coefficient")`.... | {
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Context: https://github.com/scikit-learn/scikit-learn/pull/31829#issuecomment-3523758213 | {
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If/when the above is implemented, it should also be possible to refactor the tree code to leverage histogram splits for bagging-based tree ensembles.
Histogram-based split is the main reason, while scikit-learn-intelex's `RandomForestClassifier` is much faster that our `RandomFor... | null | {
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In `sklearn/tree/_criterion.pyx`, criteria `"friedman_mse"` (class `FriedmanMSE(MSE)`) and `"squared_error"` (class `MSE`) are mathematically equivalent, they use different but equivalent formulas. This is confusing, and I think that:
- `"friedman_mse"` criterion should be deprecated then removed.... | {
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#### Reference Issues/PRs
The three impurity related bugs:
- https://github.com/scikit-learn/scikit-learn/issues/32178
- http... | {
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pytest 9.0.1 has been released 2 hours ago, which should fix the issue. Let's see if the wheels build is successful.
Edit: the wheels build was successful see [build log](https://github.com/scikit-learn/scikit-learn/actions/runs/19301332929/job/55196353527?pr=32698). | {
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This PR improves the documentation for the distance metric parameter in BinaryTree classes (KDTree and BallTree) to provide clearer guidance on valid metrics and address the limitation with callable functions.
# Checklist
- [x] Code changes made
- [x] Documentation updated
- [ ] Tests not applicable (docume... | {
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Towards #26024
#### What does this implement/fix? Explain your changes.
Add array API support to `davies_bouldin_score`
#### Any other comments? | {
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Hello :)
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Extreme RAM spike and OOM after upgrade (0.24.2 → 1.1.1) for ultra‑wide sparse L1 Logistic Regression (liblinear & saga) – baseline 680 GB → >1.4 TB (ref #28993)
Summary
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🙌 Thanks for contributing a pull request!
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👀 Please ensure you have taken a look at the contribution guidelines:
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See https://github.com/pytest-dev/pytest/issues/13895 for the pytest issue, `raise unittest.SkipTest` raises in pytest 9.0 released on November 8.
Could be a temporary work-around depending how fast pytest merges ht... | {
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Fixes #30389
#### What does this implement/fix? Explain your changes.
This PR makes the previously private functions `_check_n_features` and `_check_feature_names` part of the public API by renaming them to `check_n_features` and `check_feature_names` respectively.
**Motivation:**
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Should we remove the 'good first issue' label?
Note that we mention this label in the "[Issues for new contributors](https://github.com/numpy/numpy/pull/21355)" section of the docs. It is also mentioned briefly at the end of the "[A typical workflow for... | {
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Related #30454
Found out in https://github.com/scikit-learn/scikit-learn/pull/32600#discussion_r2505943104
#### What does this implement/fix? Explain your changes.
Adds info on what happens when non-NumPy array input occurs with `array_api_dispatch=False`
I only realised that we do th... | {
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Currently, `sklearn.cross_decomposition.PLSRegression` does not expose any measure of explained variance for either the predictor (`X`) or response (`Y`) spaces.
In different disciplines (such as multivartiate statistical process control, -omic sciences or chemometrics), t... | null | {
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In https://scikit-learn.org/stable/modules/generated/sklearn.datasets.load_iris.html the example is introduced as "Let’s say you are interested in the samples 10, 25, and 50, and want to know their class name."
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Clarifies that `train_test_split` preserves input data types, which helps beginners understand why mixed input types (DataFrame + numpy array) result in mixed output types. Many beginners find it confusing when they get different types for X_train (DataFrame) and y_train (numpy arra... | {
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When using StandardScaler with a pandas DataFrame that has empty strings as feature names (which can happen with certain data processing pipelines), the scaler raises a confusing error message that doesn't clearly indicate the root cause of the problem.
The error message should be more descriptiv... | {
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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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As a result I think it would be useful if we create a triaging guide as part of our developer/maintainer documentation. The goal of th... | null | {
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The idea is to provide a label ("Needs Decision") that can be applied to an issue that will trigger a comment to be added that explains that, based on p... | {
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Partially solves #28711.
This is the the no-brainer of https://github.com/scikit-learn/scikit-learn/pull/32042#issuecomment-3249621324.
#### What does this implement/fix? Explain your changes.
This PR
- for class LogisticRegression
deprecates the parameters penalty
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Unable to find junit file. Please see link for details. | {
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#### Reference Issues/PRs
Follow up to #30134 where we renamed private `_binary_clf_curve` to `confusion_matrix_at_thresholds`
#### What does this implement/fix? Explain your changes.
Renames tests to use the new name `confusion_matrix_at_thresholds`, AFAICT there are now no references to `_binary_clf_curve`... | {
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## Summary
New contributors frequently comment “Can I take this?” on issues without the *help wanted* label. This creates notification noise and does not trigger CI assignment. The current contributing docs lead with “apply the ‘help wanted’ label to find issues… then comment `/take`”, which is easy to mislead as “`/... | {
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~~edit: I shouldn't have added a ping, this PR is not ready.~~ | {
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Suggested here https://github.com/scikit-learn/scikit-learn/pull/32646#discussion_r2493608193
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Fixes `permutation_importance` to work with Polars DataFrames when used in pipelines with `ColumnTransformer`.
## Problem
When using `permutation_importance` with Polars DataFrames in a pipeline containing a `ColumnTransformer` with string column names, it would fail with:
```
ValueError: Specifyi... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/32650 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32650/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32650/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/32650/events | https://github.com/scikit-learn/scikit-learn/issues/32650 | 3,589,555,370 | I_kwDOAAzd1s7V9ESq | 32,650 | Finish Python 3.10 -> 3.11 bump | {
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> This issue is already being worked on, a comment like "can I work on this" or "assign this issue to me" may get you banned from the repo
From git grep below
- [x] 3.10 -> 3.11 README.rst, pyproject.toml, meson.build, doc/developers/development_setup.rst
- [ ] `update_environment_and_lock_files.py` the... | {
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```
##[error]This is a scheduled macos-13 brownout. The macOS-13 based runner images are being deprecated. For mo... | {
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