2.15.3

2.15.3 (2026-06-10)

Fix

• fix: Support scikit-learn 1.9 in ZeroShotClassification (#4790)

scikit-learn 1.9 raises "ValueError: Mix of label input types" when
classification metrics receive string y_true with numeric y_pred.
Zeroshot predictions are always integer indices into the candidate
labels, so string dataset labels are now mapped to their candidate
index before scoring. Unmappable string labels raise a clear error
instead of silently scoring 0.0, which is what scikit-learn < 1.9 did.

Removes the <1.9.0 pin introduced as a stopgap in #4783.

Fixes #4784

Co-authored-by: Kenneth Enevoldsen <kennethcenevoldsen@gmail.com> (5e8f0e1)