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guofu 5109ac4eb3 Simplify pipeline with struct columns ... - Remove split_at_end parameter from pipeline.transform(), always return DataFrame - Add pack_struct parameter to pack feature groups into struct columns - Rename exporters: select_feature_groups_from_df -> get_groups, select_feature_groups -> get_groups_from_fg - Add pack_structs() and unpack_struct() helper functions - Remove split_from_merged() method from FeatureGroups (no longer needed) - Rename dump_polars_dataset.py to dump_features.py with --pack-struct flag - Update README with new CLI usage and struct column documentation Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>		2 days ago
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processors	Simplify pipeline with struct columns	2 days ago
__init__.py	Simplify pipeline with struct columns	2 days ago
qlib_loader.py	Fix FlagMarketInjector and FlagSTInjector, add polars dataset dump script	4 days ago