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- test_estimators[RANSACRegressor(estimator=LinearRegression(),max_trials=10)-check_regressors_train]
- test_estimators[RANSACRegressor(estimator=Linear... | null | {
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Towards #27676
#### What does this implement/fix? Explain your changes.
- add callback support to `Pipeline.fit` by emitting one callback task per pipeline step
- keep the `Pipeline` step callbacks observational only: callback stop values are ignored
- support step callbacks for regular, `Non... | {
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Towards #27676
#### What does this implement/fix? Explain your changes.
- add callback support to `KMeans` by emitting nested `init` and `iter` tasks during `fit`
- honor callback stop signals at both the iteration and initialization levels in `KMeans`
- add callback support to `MiniBatchKMea... | {
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None
#### What does this implement/fix? Explain your changes.
#### AI usage disclosure
None
#### Any other comments?
| null | {
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None
#### What does this implement/fix? Explain your changes.
The current user guide makes it hard to find "array API" or "pandas/polars output transform" unless one searches for it.
#### AI usage disclosure
None
#### Any other comments? | null | {
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**Converted tests:**
- `test_prediction_bayesian_ridge_ard_with_constant_input`: `check_random_state(42)` → `check_random_state(global_random_seed)`
- `test_std_bayesian_ridge_ard_with_constant_in... | 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
of having maintainers review your PR:
... | {
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Add a regression test comparing SAGA with non-uniform sample_weight ag... | {
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} | The goal of this issue is to track the support of `estimator.fit(X, y, sample_weight=..)` throughout the library. As of scikit-learn version 1.8:
- [ ] `sklearn.cluster.AffinityPropagation`
- [ ] `sklearn.cluster.AgglomerativeClustering`
- [ ] `sklearn.cluster.Birch`
- [ ] `sklearn.cluster.FeatureAgglomeration`
- [ ] `... | null | {
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Addresses a common need for fixed-window cross-validation (rolling origin) in time series, distinct from the expanding window strategy of `TimeSeriesSplit`.
### **What does this implement/fix? Explain your changes.**
This PR introduces a new cross-validator: `RollingTimeSeriesSplit`.
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the `traverse_upwards` function in `_tree.pyx` does boolean-indexed lookups on the condensed tree structured array:
```python
parent = cluster_tree[cluster_tree['child'] == leaf]['parent']
parent_eps = 1 / cluster_tree[cluster_tree['child'] == parent]['value']
```
these always return shape-(1,) arrays,... | {
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I noticed new behaviour in `sklearn.decomposition.DictioanryLearning`. I have noticed an error that I have not seen before. Learner `transform_n_nonzero_coefs` > `n_components` and only when `transform_algorithm = "omp"`.
Example below is similar to ... | null | {
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https://github.com/scikit-learn/scikit-learn/pull/33089#discussion_r2704525722
#### What does this implement/fix? Explain your changes.
This PR deprecates the `shuffle` and `random_state` params from `TargetEncoder`. They are now redundant and had only been there in the first place becau... | null | {
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Fixes #33383
#### What does this implement/fix? Explain your changes.
`check_array` has a block that normalizes the `dtype` argument by calling `np.dtype(dtype)` (line ~952 in `validation.py`). This works fine for numpy dtypes and string aliases like `"float32"`, but blows up with a `TypeEr... | {
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Closes #10141
The `precisions_cholesky_` attribute in `GaussianMixture` was described as:
> The Cholesky decomposition of the precision matrices of each mixture component.
This phrasing is ambiguous — it could mean the full factorization object, or the lower-tr... | null | {
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Closes #33436.
#### What does this implement/fix? Explain your changes.
`SGDClassifier.partial_fit`, `SGDRegressor.partial_fit`, and `SGDOneClassSVM.partial_fit` currently raise `ValueError` when `sample_weight` is all zeros (behavior introduced in PR #32212). That's fine for `fit()` — fitt... | {
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Sorry for that. | {
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When working with high-cardinality categorical columns (e.g. city names,
product IDs, user IDs), users need a simple, leak-proof way to encode
categories as their frequency in the training set.
Currently users must hand-roll this inside a pipeline or install external
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This will also allow use to have more freedom in the naming of test functions parametrized for array API namespace... | {
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As discussed in https://github.com/scikit-learn/scikit-learn/pull/32732#discussion_r2866729326
#### What does this implement/fix? Explain your changes.
Improve description of values expected by `y_score` param, which listed three possibilities since #6336 of which two were meant the same.... | null | {
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Closes #3702, finally.
Contributes to #33457
#### What does this implement/fix? Explain your changes.
This add support to fit
- with `sample_weight`
- on sparse `X`
for
- `MultiTaskElasticNet`
- `MultiTaskLasso`
- `MultiTaskElasticNetCV`
- `MultiTaskLassoCV`
#### AI usage ... | null | {
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`StandardScaler.fit` and `.partial_fit` now reject negative `sample_weight`.
They now call `_check_sample_weight(..., ensure_non_negative=True)`
This prevents negative weights from producing impossible negative variance, a RuntimeWarning, and silent `scale_=1` fallback.
###... | {
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This PR should fix the failures discovered in the related lockfile upd... | {
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`SGDClassifier.partial_fit` changes the model state even when the new batch has `sample_weight=np.zeros(n_samples)`. In the code below, an all-zero-weight batch changes `coef_`, which affects subsequent predictions, and advances `t_`, which changes th... | null | {
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N/A
#### What does this implement/fix? Explain your changes.
This PR enables `clang-cl` support for Windows ARM64 builds in the CI pipeline.
Majority of benchmarks show performance improvement with `clang-cl` (about ~50%).
Minor to low regressions observed in a few cases (upto ~3%).
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### Note
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Clarified why double underscore (`__`) is used instead of dot (`.`) for nested parameters in GridSearchCV.
Changes applied to:
- Glossary
- User Guide
- GridSearchCV docstring
### Why
The previous wording was unclear and could confuse users when setting parameters in a Pipeline.
This documentatio... | {
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Updates `actions/download-artifact` from 7 to 8
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://gi... | {
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Ok now I understand why
### Suggest a potential alternative/fix
No need | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33427 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33427/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33427/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33427/events | https://github.com/scikit-learn/scikit-learn/pull/33427 | 4,006,666,861 | PR_kwDOAAzd1s7HGZ9n | 33,427 | FIX raise clear ValueError for mixed-type input in check_array | {
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#### Reference Issues/PRs
Fixes #33390
#### What does this implement/fix? Explain your changes.
This PR fixes a numerical stability issue where `RidgeClassifier` produced incorrect (extreme) decision values when the input labels `y` were of an unsigned integer dtype (e.g., `uint64`).
**The Root Cause:**
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This PR adds an **opt-in walk-forward / rolling-origin mode** to
`sklearn.model_selection.TimeSeriesSplit` via:
- `n_splits="walk_forward"` (sentinel mode)
- `min_train_size` to specify the initial training window size for expanding walk-forward evaluation
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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 #33390.
What does this implement/fix? Explain your changes.
This PR ensures that RidgeClassifier can handle target arrays (y) with unsigned integer dtypes (e.g., uint8, uint64).
Although some environments might handle these types implicitly, scikit-learn's internal LabelBinarizer and ... | {
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"node_id": ... | open | false | [] | null | 0 | 2026-02-27T15:48:42 | 2026-03-04T18:43:52 | null | null | MEMBER | null | null | null | null | As discussed in the last meeting this PR explores an alternative to https://github.com/scikit-learn/scikit-learn/pull/33340
ping @ogrisel @StefanieSenger @lesteve
Personally I tend to prefer slightly the other version because it doesn't extend the API of `clone`, but the coupling in the other PR is not ideal eit... | null | {
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Extracted from https://github.com/scikit-learn/scikit-learn/pull/33340 because we decided to not couple propagate_callback_context and clone.
ping @lesteve @StefanieSenger | {
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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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- It is harder to detect regressions.
- We don’t see the big time improvements in the last releases.
This issue is to track the (re-) deployment of the ASV benchmarks until they are back... | null | {
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Closes #19178.
#### What does this implement/fix? Explain your changes.
This updates `Nystroem` documentation to remove ambiguity around `kernel="precomputed"`:
- documents that `X` is interpreted as a kernel matrix when `kernel="precomputed"`
- documents the current `fit` constraint (`n_com... | null | {
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I would like to suggest the inclusion of a new confusion matrix algorithm that complies with scikit-learn’s inclusion criteria and addresses an important limitation of the one-vs-rest 2x2 confusion matrices currently implemented for multi-label classification problems in sc... | null | {
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Fixes #33386.
What does this implement/fix? Explain your changes.
This PR improves the documentation for RandomForestClassifier, RandomForestRegressor, and ExtraTreesClassifier by clarifying the heuristics behind the default max_features values.
Specifically, it adds explanations to the doc... | null | {
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None
#### What does this implement/fix? Explain your changes.
In some CI runs `test_calibrated_classifier_cv_works_with_large_confidence_scores` is the slowest test.
#### AI usage disclosure
None | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33413 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33413/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33413/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33413/events | https://github.com/scikit-learn/scikit-learn/pull/33413 | 3,995,148,509 | PR_kwDOAAzd1s7GhcXy | 33,413 | FIX avoid repeated warning emission in Parallel (no-hyperopt reproducible) | {
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This PR keeps the same fix as #33257, but documents and validates a reproducer **without hyperopt**. @lesteve
Related to #33230.
Supersedes #33257.
The core change is in `sklearn.utils.parallel` warning-filter propagation:
- serialize warning categories as `(module, qualname)` references,
- resto... | {
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As of scikit-learn version 1.8, we have
- `GradientBoostingClassifier`
- `GradientBoostingRegressor`
that perform gradient boosting with trees (`DecisionTreeRegressor`) as base estimator. What is missing is the ability to perform gradient boosting with **any base estimator**.
#### Proposal 1:
Ad... | null | {
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Create a sklearn global dedicated manager for all callbacks.
ping @FrancoisPgm @StefanieSenger @lesteve @ogrisel | {
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This PR is POC for an extension of the callback API to work in functions that act like meta-estimators such as `cross_validate`.
This PR implements a minimal extension that does not handle nesting such functions, but I think t... | null | {
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I double-checked that there was no Azure related thing via the `git grep` below. The remaining files that mentions Azure:
- pip-compile `_lock.txt` lock-files that mentions the previous `build_tools/azure` in a c... | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33402 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33402/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33402/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33402/events | https://github.com/scikit-learn/scikit-learn/issues/33402 | 3,986,980,426 | I_kwDOAAzd1s7tpH5K | 33,402 | ⚠️ CI failed on Unit tests Linux x86-64 pymin_conda_forge_openblas_ubuntu_2204 (last failure: Feb 25, 2026) ⚠️ | {
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Unable to find junit file. Please see link for details. | null | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33401 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33401/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33401/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33401/events | https://github.com/scikit-learn/scikit-learn/issues/33401 | 3,985,786,083 | I_kwDOAAzd1s7tkkTj | 33,401 | Add "auto" option as default solver to GLMs | {
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} | Currently, our GLMS like `LogisticRegression`, `PoissonRegressor` and others have default `solver="lbfgs"`. Unfortunately, this solver cannot solve L1-penalized objectives. Therefore, `LogisticRegression(l1_ratio=1)` errors.
I propose to change the default solver to `"auto"` with the meaning:
1. The solver chosen may ... | null | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33400 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33400/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33400/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33400/events | https://github.com/scikit-learn/scikit-learn/pull/33400 | 3,984,939,827 | PR_kwDOAAzd1s7F_ynw | 33,400 | DOC clarify max_features defaults for RandomForestClassifier and RandomForrestRegressor. | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33399 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33399/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33399/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33399/events | https://github.com/scikit-learn/scikit-learn/pull/33399 | 3,983,950,517 | PR_kwDOAAzd1s7F8f-l | 33,399 | ENH: Display fitted attributes in HTML representation | {
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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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of having maintainers review your PR:
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33398 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33398/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33398/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33398/events | https://github.com/scikit-learn/scikit-learn/issues/33398 | 3,983,581,915 | I_kwDOAAzd1s7tcKLb | 33,398 | RFC Collecting "AI infrastructure" for work on scikit-learn | {
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Once we have an overview of ideas and... | null | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33397 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33397/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33397/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33397/events | https://github.com/scikit-learn/scikit-learn/pull/33397 | 3,982,846,627 | PR_kwDOAAzd1s7F4wH0 | 33,397 | CI Fix the doc build (deprecation warning) | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33396 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33396/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33396/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33396/events | https://github.com/scikit-learn/scikit-learn/pull/33396 | 3,982,843,456 | PR_kwDOAAzd1s7F4vgF | 33,396 | DOC Fix deprecated kwargs in `PrecisionRecallDisplay` in example | {
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https://github.com/scikit-learn/scikit-learn/pull/30508#issuecomment-3950312489
#### What does this implement/fix? Explain your changes.
Missed in #30508
Uses the new `curve_kwargs` instead of passing plot kwargs as **kwargs, to avoid deprecation warning.
#### AI usage disclosure
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Fixes #27012
## What does this implement/fix? Explain your changes.
`SimpleImputer.inverse_transform` produces incorrect results when `keep_empty_features=False` (the default) and some columns were all-missing at fit time. Those columns are dropped during `transform`, but `inverse_transform` ... | {
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Enhanced a testing callback to record the hook calls and added tests to check the count of callback hooks.
A next step could be to check that the hook calls matches the context tree but let's keep this PR simple.
ping @FrancoisPgm @StefanieSenger | {
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## What does this PR do?
`PrecisionRecallDisplay.from_predictions` computed `prevalence_pos_label` using `Counter(y_true)`, which fails for non-NumPy array-like inputs (e.g. PyTorch tensors). `Counter` creates keys that are tensor elements, so looking up `class_count[pos_label]` (where `pos_label` is a ... | {
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Fixes #33383
#### What does this implement/fix? Explain your changes.
Since Pandas 3, `StringDType` is no longer a valid NumPy dtype. `check_array()` unconditionally calls `np.dtype(dtype)` to normalize the dtype parameter for downstream `xp.isdtype()` checks. This raises `TypeError` for no... | {
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Fixes #33390
#### What does this implement/fix? Explain your changes.
When `y` has an unsigned integer dtype (e.g. `uint64`) and `neg_label` is negative (e.g. `-1` in `RidgeClassifier`), `label_binarize()` preserves the unsigned dtype as `int_dtype_`. The cast at line 675 (`xp.astype(Y, int... | {
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I had my targets in UInt64 dtype and RidgeClassifier decision_function was producing giant values. This doesn't happen with other sklearn classifiers and can cause silent and hard to find bugs when RidgeClassifier is used.
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Adds an xfail regression test showing that fitting multiple LinearSVR instances concurrently with joblib threading can yield non-deterministic coefficients.
[x] Code generation
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"number": 6... | 1 | 2026-02-24T04:33:17 | 2026-02-26T16:30:45 | null | null | CONTRIBUTOR | null | null | null | null | #### Reference Issues/PRs
Following up from the deprecation of the `probability=True` in SVC and NuSVC in PR #32050 we now also deprecate the probA_ and probB_ properties. Platt scaling results for probA and probB are still returned in the BaseLibSVM class but unused
#### What does this implement/fix? Explain you... | null | {
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- Test Collection Failure
- test_link_inverse_array_api[11-MultinomialLogit-torch-cpu-float32] | null | {
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While building a Random Forest model for a course project, I found myself confused by the different default values for max_features in classifiers vs regressors and had to search externally to understand why.
In the ensemble documentation (https://scikit-learn.org/st... | null | {
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🙌 Thanks for contributing a pull request!
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Since Pandas 3.0, `StringDType` is not anymore a valid Numpy data type. This makes `check_column_or_1d` crash when called with that type as `dtype` parameter.
### Steps/Code to Reproduce
```python
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This addresses the `# TODO(1.10)` found in `sklearn/linear_model/_logistic.py` regarding the simplification of the error message for the `liblinear` solver when `penalty=None`.
#### What does this implement/fix? Explain your changes.
This PR performs two main updates:
1. **Logic Update**... | {
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- [x] Triaged TODO(1.9) items and completed this one.
- [x] Removed deprecated `sparse` parameter from `metrics.fowlkes_mallows_score`.
- [x] Removed deprecated warning/handling path.
- [x] Removed related deprecation test.
- [x] Updated parameter validation/docstring accordingly. | {
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Goal: remove sparse from the function signature, warnings, and tests.
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This PR adds a `partial_fit` method to the `NearestCentroid` classifier to enable incremental (online) learning.
The implementation updates class centroids using a weighted mean based on the number of samples observed per class, allowing the model to be trained on data batches without retraining from s... | {
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Centroids are updated using weighted mean based on class counts.
Includes tests and documentation. | null | {
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**Problem:** The `copy` parameter docstring for `mutual_info_regression` and `mutual_info_classif` states "If set to False, the initial data will be overwritten", but `y` was never overwritten because `scale(y, with_mean=False)` did not pass `copy=copy` (defaulting to `copy=True`).
**Changes:**
- Pass `... | {
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Fixes #29521.
This PR adds a `zero_division` parameter to `ndcg_score` (and the internal `_ndcg_sample_scores`) to handle the case where all true relevance scores for a sample are zero (IDCG = 0, so NDCG is undefined).
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> This is a request for comment (RFC) and is not open for contribution. Great if you are interested to contribute to scikit-learn :pray:. Please have a look at our [contributing doc](https://scikit-learn.org/dev/developers/contributing.html) and in particular the section [New Contributors](https://scikit-l... | null | {
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- test_precomputed_nearest_neighbors_filtering[18] | {
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Closes #31503.
This PR adds a Boruvka MST backend to `cluster.HDBSCAN`, exposes configurable MST dispatch via `mst_algorithm`, and parallelizes Boruvka core-distance querying for large datasets.
## Why
On large dense inputs, the HDBSCAN path in scikit-learn lacked a Boruvka MST backend and showed slower fi... | null | {
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The issue causes nonsensical huge changes in perplexity when evaluating on small splits, because the beta prior term is O(components_) and should be... | null | {
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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33361 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33361/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33361/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33361/events | https://github.com/scikit-learn/scikit-learn/pull/33361 | 3,974,817,211 | PR_kwDOAAzd1s7Feo-t | 33,361 | FIX StratifiedGroupKFold raises ValueError when n_splits > n_groups | {
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] | closed | false | [] | null | 1 | 2026-02-22T15:28:34 | 2026-02-22T23:53:11 | 2026-02-22T23:53:11 | null | NONE | null | null | null | null | ## Summary
Fixes #33085
- `StratifiedGroupKFold` silently produced degenerate (empty) splits when `n_splits` exceeded the number of groups. This adds the same validation check that `GroupKFold` already has, raising a `ValueError` with the same message format.
## Test plan
- [x] Added non-regression test `test_strat... | {
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