lars
7df1945384
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giant.pipeline.run_setup_stage (used by both giant train and dwarf warm-cache) previously opened and fully read each parquet file 4-6 separate times via pandas, with per-row Python loops padding the secondary list columns on every chunk of the normalizer-fitting pass. - giant/data/loader.py: pandas -> polars throughout; ragged sec_*_list padding is now a single vectorized polars expression instead of a per-row Python loop (including a .iloc[i] loop for directions). - giant/data/scan.py (new): a fused metadata scan answering the event index, pdg/material vocab, process counts, and pooled-pdg counts in one pass per file instead of one pass per section. Frequency-ranking ties are now an explicit (-count, first_seen) contract instead of an accident of pandas' value_counts iteration order. - giant/pipeline.py: run_setup_stage restructured to consult the cache for every section first, then issue one combined scan request for whatever's missing. - giant/geometry.py: ported the one remaining pandas groupby to polars. - pyproject.toml: polars promoted to a core dependency, pandas moved to dev (only test fixtures still use it). - giant/tools/profile_setup_scan.py (new): synthetic-data benchmark for this scan, mirroring profile_analysis_costs.py's pattern. Also fixes a real deadlock this surfaced: DataLoader worker subprocesses fork() on Linux, and polars' native thread pool doesn't survive a fork — a worker touching polars after the parent already had hangs instantly. giant/pipeline.py's train/val DataLoaders now use multiprocessing_context="spawn" whenever num_workers>0. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DdT32YWNEwnVLZUHsgdeSC