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bug: Nested Pipeline is not fitted (sklearn 1.8)

Bug

Needs TriageIssue requires triageIssue requires triage

Status: Open.

#32910 In scikit-learn/scikit-learn;

· auguste-probabl opened on Dec 16, 2025

Call to estimator.score() in RANSAC even if the produced input data set is too small - fix proposed

Bug

Needs TriageIssue requires triageIssue requires triage

Status: Open.

#32908 In scikit-learn/scikit-learn;

· gweberbv-beep opened on Dec 16, 2025

<code>DecisionBoundaryDisplay</code> with <code>response_method="predict"</code> has inconsistent handling for the colormap in the multiclass case

Bug

module:inspection

Status: Open.

#32872 In scikit-learn/scikit-learn;

· ogrisel opened on Dec 9, 2025

BUG: <code>DecisionTreeRegressor</code>: invalid impurity for <code>criterion="poisson"</code> with missing values

Bug

Needs TriageIssue requires triageIssue requires triage

Status: Open.

#32870 In scikit-learn/scikit-learn;

· cakedev0 opened on Dec 9, 2025

<code>DecisionBoundaryDisplay.from_estimator</code> only displays up to 7 distinct colours

Bug

Status: Open.

#32866 In scikit-learn/scikit-learn;

· ThexXTURBOXx opened on Dec 8, 2025

FeatureUnion with polars output fails due to missing column renaming in adapter interface

Bug

Status: Open.

#32852 In scikit-learn/scikit-learn;

· nocoding03 opened on Dec 7, 2025

nan_euclidean_distances producing distance matrix not symmetrical due to floating point precision

Bug

Status: Open.

#32848 In scikit-learn/scikit-learn;

· aydemiro opened on Dec 5, 2025

ElasticNetCV alpha_grid does not take positive constraint into account

Bug

module:linear_model

Status: Open.

#32767 In scikit-learn/scikit-learn;

· JasonLiJT opened on Nov 23, 2025

LocalOutlierFactor with Mahalanobis distance returns different results based on <code>n_jobs</code> parameter

Bug

Needs InvestigationIssue requires investigationIssue requires investigation

Status: Open.

#32753 In scikit-learn/scikit-learn;

· sroener opened on Nov 20, 2025

BUG: trees: <code>criterion="friedman_mse"</code> is buggy for multi-output

Bug

Status: Open.

#32718 In scikit-learn/scikit-learn;

· cakedev0 opened on Nov 15, 2025

BUG: tree/forest regressor: impurity decrease calculation is wrong for criterion "friedman_mse"

Bug

Status: Open.

#32707 In scikit-learn/scikit-learn;

· cakedev0 opened on Nov 13, 2025

BUG: <code>QuantileTransformer(ignore_implicit_zeros=True)</code> sub-sampling behavior is incorrect

Bug

Status: Open.

#32585 In scikit-learn/scikit-learn;

· cakedev0 opened on Oct 27, 2025