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Array API: Ridge with alpha as an array fails due to misconfigured checks

Bug

Needs TriageIssue requires triageIssue requires triage

Status: Open.

#34003 In scikit-learn/scikit-learn;

· tomMoral opened on May 12, 2026

Make the _parameter_constraint attribute public and mandatory for every model

Needs TriageIssue requires triageIssue requires triage

New Feature

Status: Open.

#34001 In scikit-learn/scikit-learn;

· eugenioLR opened on May 12, 2026

Use automatic chunk size in ledoit_wolf_shrinkage (and friends?)

Array API

Status: Open.

#33986 In scikit-learn/scikit-learn;

· betatim opened on May 11, 2026

Improve pairwise_distances so that it works with array API inputs for all supported metrics

Array API

Status: Open.

#33982 In scikit-learn/scikit-learn;

· betatim opened on May 11, 2026

CountVectorizer fails when dealing with short strings and ngram_range > len of the strings

Bug

Needs TriageIssue requires triageIssue requires triage

Status: Open.

#33981 In scikit-learn/scikit-learn;

· rcap107 opened on May 11, 2026

DOC refactor examples to use DecisionBoundaryDisplay

Documentation

Status: Open.

#33980 In scikit-learn/scikit-learn;

· AnneBeyer opened on May 11, 2026

Native categorical splitting enhancements in DecisionTree, ExtraTree, RandomForest and ExtraTrees

HardHard level of difficultyHard level of difficulty

module:tree

New Feature

Status: Open.

#33965 In scikit-learn/scikit-learn;

· adam2392 opened on May 10, 2026

[FEA] Add Ambiguity Range metric for safety-critical classification

Needs TriageIssue requires triageIssue requires triage

New Feature

Status: Open.

#33963 In scikit-learn/scikit-learn;

· kianushmaleki opened on May 9, 2026

PERF: Avoid unnecessary n_samples x n_samples diagonal sparse matrix in _rescale_data

Needs TriageIssue requires triageIssue requires triage

New Feature

Status: Open.

#33960 In scikit-learn/scikit-learn;

· Vishal35198 opened on May 9, 2026

META: Use narwhals in codebase

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

Status: Open.

#33958 In scikit-learn/scikit-learn;

· lorentzenchr opened on May 9, 2026

Indicate array API support on an estimator's API page

Array API

Documentation

Needs DecisionRequires decisionRequires decision

Status: Open.

#33945 In scikit-learn/scikit-learn;

· betatim opened on May 7, 2026

test_search_cv_sample_weight_equivalence[estimator0] fails when built with -march=armv9-a

Bug

Needs TriageIssue requires triageIssue requires triage

Status: Open.

#33942 In scikit-learn/scikit-learn;

· ggardet opened on May 7, 2026