Add configurable label overlap handling for classification holdout strategy#1491

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copilot/fix-training-test-set-overlap

Jan 21, 2026

Commits on Jan 20, 2026

Fix potential ValueError with max() on empty lists and simplify test assertions

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Add extra bounds checking for label_matches indices

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Merge branch 'main' into copilot/fix-training-test-set-overlap
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Merge branch 'main' into copilot/fix-training-test-set-overlap
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Fix pandas_on_spark compatibility by using iloc_pandas_on_spark util method

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Run pre-commit to fix formatting issues

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Improve missing label handling to avoid overlap when possible

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Fix: ensure at least 1 instance remains in original set when re-splitting

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Merge branch 'main' into copilot/fix-training-test-set-overlap
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Merge branch 'main' into copilot/fix-training-test-set-overlap
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Refactor: Extract missing label handling into two methods (fast/slow)

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Add usage example for allow_label_overlap to Best-Practices.md

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Merge branch 'main' into copilot/fix-training-test-set-overlap
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Address code review feedback: update documentation and tests

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Commits on Jan 21, 2026