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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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https://api.github.com/repos/scikit-learn/scikit-learn/issues/33430 | https://api.github.com/repos/scikit-learn/scikit-learn | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33430/labels{/name} | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33430/comments | https://api.github.com/repos/scikit-learn/scikit-learn/issues/33430/events | https://github.com/scikit-learn/scikit-learn/pull/33430 | 4,008,239,309 | PR_kwDOAAzd1s7HLfat | 33,430 | DOC: explain why __ is used instead of . for nested params (#33428) | {
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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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