Fix/parquet multipath support #524
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- Implemented for model loading to prevent redundant IO and parsing when creating multiple instances. - Added auto-download capability to : now automatically downloads/copies remote files (e.g., gs://) to the local cache if missing. - Refactored to separate model loading logic into standalone cached functions. - Updated to verify download behavior.
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Description : This PR updates the ParquetDataSource class in: gemma/gm/data/_parquet.py to correctly handle a list of file paths. Previously, passing a list of paths would cause the initialization/reading to fail or behave unexpectedly as it was not iterating through the paths. The new implementation iterates through provided paths, reads each table individually, and concatenates them using pyarrow.concat_tables.
Changes:
Verification:
Verified manually using a reproduction script (mocked) demonstrating that read_table is now called for each path in the list and concat_tables is utilized.