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Fix #1974: Cross validation with multiprocessing RuntimeError: dictionary changed size during iteration - #2766

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alibb007:hq/fix-1974-cross-validation-with-multi-10221458

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Fixes #1974.

cross_validation now collects all parallel pool.map results into a list inside the try, so the lazy result iterator is no longer consumed after the executor has been shut down in finally.

Changed: python/prophet/diagnostics.py

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Closing this one; reopening the same change from a cleanly named branch.

@alibb007 alibb007 closed this Oct 22, 2026
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alibb007 deleted the hq/fix-1974-cross-validation-with-multi-10221458 branch October 22, 2026 22:12
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Cross validation with multiprocessing RuntimeError: dictionary changed size during iteration

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