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BUG Spurious UserWarning with the deprecation of penalty in LogisticRegression

Needs TriageIssue requires triageIssue requires triage

Status: Open.

#33871 In scikit-learn/scikit-learn;

· glemaitre opened on Apr 27, 2026

_MPLTreeExporter: ValueError when using custom colors

Bug

Needs TriageIssue requires triageIssue requires triage

Status: Open.

#33844 In scikit-learn/scikit-learn;

· moi90 opened on Apr 24, 2026

RFC Add Metadata to HTML display of estimators?

Enhancement

Metadata Routingall issues related to metadata routing, slep006, sample propsall issues related to metadata routing, slep006, sample props

Status: Open.

#33842 In scikit-learn/scikit-learn;

· AnneBeyer opened on Apr 23, 2026

pairwise_distances throws warnings with array API classes

Array API

Bug

Status: Open.

#33829 In scikit-learn/scikit-learn;

· david-cortes-intel opened on Apr 22, 2026

.score() with array API does not follow same 'everything follows X' logic as .fit()

Array API

Bug

Status: Open.

#33822 In scikit-learn/scikit-learn;

· david-cortes-intel opened on Apr 21, 2026

ENH: Add confusion_matrix_diff to compare multiple models against a baseline

Closing candidateindicating we might close this one soon / at a later reviewindicating we might close this one soon / at a later review

Needs Info

New Feature

Status: Open.

#33800 In scikit-learn/scikit-learn;

· Harguna opened on Apr 19, 2026

Optimized _class_means in sklearn/discriminant_analysis.py

module:discriminant_analysis

Needs BenchmarksA tag for the issues and PRs which require some benchmarksA tag for the issues and PRs which require some benchmarks

Performance

Status: Open.

#33793 In scikit-learn/scikit-learn;

· grahamonica opened on Apr 19, 2026

[Callbacks] Add mechanism to realiably re-set max_subtasks on CallbackContext?

Callbacks

Status: Open.

#33783 In scikit-learn/scikit-learn;

· StefanieSenger opened on Apr 17, 2026

[BUG] BayesianRidge.predict with return_std=True fails to center test features, leading to incorrect predictive variance

Bug

Needs TriageIssue requires triageIssue requires triage

Status: Open.

#33757 In scikit-learn/scikit-learn;

· danilo-silva-ufsc opened on Apr 15, 2026

Add MoveTo transformer to move X to a different array namespace/device

Array API

Needs DecisionRequires decisionRequires decision

Status: Open.

#33737 In scikit-learn/scikit-learn;

· betatim opened on Apr 13, 2026

Use clang-cl (LLVM) compiler for Windows ARM64 wheel builds

Build / CI

Needs InvestigationIssue requires investigationIssue requires investigation

Status: Open.

#33715 In scikit-learn/scikit-learn;

· priyadharshni-mcw opened on Apr 9, 2026

Add replaced_undefined_by in classification metrics

API

Enhancement

Meta-issueGeneral issue associated to an identified list of tasksGeneral issue associated to an identified list of tasks

Status: Open.

#33712 In scikit-learn/scikit-learn;

· jeremiedbb opened on Apr 8, 2026

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1.9