Add domain compression API to discrete mechanisms#56
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Introduce pure-function compression API in `common.py` for all discrete mechanisms. Each mechanism can now optionally compress rare categorical values (count < 3*sigma) into an "Other" bin — a privacy-free post-processing step that shrinks the domain for faster PGM estimation. New public functions: - `compress_measurements(one_way_measurements, columns)`: returns `(rare_value_masks, compressed_measurements)`. - `compress_dataset(data, rare_value_masks)`: compresses an mbi.Dataset via `vtx.merge_rare_values`. - `decompress_dataset(data, original_domain, rare_value_masks, rng)`: restores merged rare values via `vtx.unmerge_rare_values`. `DiscreteMechanismResult` exposes `rare_value_masks` and `original_domain` so callers can decompress explicitly. PiperOrigin-RevId: 937313573
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Add domain compression API to discrete mechanisms
Introduce pure-function compression API in
common.pyfor all discretemechanisms. Each mechanism can now optionally compress rare categorical
values (count < 3*sigma) into an "Other" bin — a privacy-free
post-processing step that shrinks the domain for faster PGM estimation.
New public functions:
compress_measurements(one_way_measurements, columns): returns(rare_value_masks, compressed_measurements).compress_dataset(data, rare_value_masks): compresses an mbi.Datasetvia
vtx.merge_rare_values.decompress_dataset(data, original_domain, rare_value_masks, rng):restores merged rare values via
vtx.unmerge_rare_values.DiscreteMechanismResultexposesrare_value_masksandoriginal_domainso callers can decompress explicitly.