Warn instead of raise when user-provided data_files yields a subset#8215
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NonMatchingSplitsSizesError fires whenever the loaded split size differs from the expected size, including when the user has explicitly passed data_files for a known subset of the dataset. The user-side workaround is verification_mode='no_checks', which silences ALL checks rather than just the split-size one. Downgrade the split-size mismatch to a UserWarning when data_files was explicitly provided by the caller. Other mismatch paths (corrupted download, wrong size for full download) remain hard errors. Fixes huggingface#7867
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Fixes #7867.
NonMatchingSplitsSizesError currently fires whenever the loaded split size differs from the expected size, including when the user explicitly passed data_files for a known subset of the dataset. The only user-side workaround is verification_mode='no_checks', which silences ALL checks rather than just the split-size one.
This PR downgrades the split-size mismatch to a UserWarning when data_files was explicitly provided by the caller. Other mismatch paths (corrupted download, wrong size for full download) remain hard errors.