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DOC: Improve formula explanation and add table for train/test sizes in TimeSeriesSplit

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

Documentation

Status: Open.

#33741 In scikit-learn/scikit-learn;

· anikchand461 opened on Apr 14, 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

·  

1.9

[Callbacks] VS Code debugger fails with EOFError during Callback instance creation

Bug

Callbacks

Status: Open.

#33710 In scikit-learn/scikit-learn;

· StefanieSenger opened on Apr 8, 2026

Add a contributor introduction to the PR template

workflowDevelopment workflow changesDevelopment workflow changes

Status: Open.

#33707 In scikit-learn/scikit-learn;

· jeremiedbb opened on Apr 7, 2026

Docs are not explicit about effect of set_params

API

Documentation

Status: Open.

#33666 In scikit-learn/scikit-learn;

· david-cortes-intel opened on Apr 1, 2026

Add 'auto' option to n_bins in calibration_curve

New Feature

Status: Open.

#33658 In scikit-learn/scikit-learn;

· ZeyuSun opened on Mar 30, 2026

[Callbacks] Should/Can we avoid creating the context tree when no callbacks ?

Callbacks

Status: Open.

#33646 In scikit-learn/scikit-learn;

· jeremiedbb opened on Mar 27, 2026

Metadata Routing causes key error when remainder="passthrough"

Bug

Status: Open.

#33614 In scikit-learn/scikit-learn;

· jinlow opened on Mar 23, 2026

RFC Improving guidance for common CI failures for new contributors

HardHard level of difficultyHard level of difficulty

RFC

Status: Open.

#33594 In scikit-learn/scikit-learn;

· virchan opened on Mar 22, 2026

[Callbacks] PERF Cache the signature of hooks in call_on_fit_task_*

Callbacks

Status: Open.

#33587 In scikit-learn/scikit-learn;

· jeremiedbb opened on Mar 19, 2026