soc139-quality-sidecars

Mirror of the R2 prefix soc139-quality-sidecars/ from soc127-dedup (Cloudflare R2) into a private HF Dataset. Generated by scripts/handoff/mirror_r2_sidecar_prefix.py on 2026-05-23.

Each row in the source R2 parquets is preserved, with one additional column appended: source_shard_path — the R2 object key the row came from. This lets you reconstruct the per-shard view if needed.

Counts

	Source (R2)	Mirror (this dataset)
Files	58,621	80 (concat into ~2 GB chunks)
Size	65.68 GB	38.89 GB (zstd-compressed)

Loading

from datasets import load_dataset
ds = load_dataset("soc139-dataset")
# or for a single chunk:
import pyarrow.parquet as pq
table = pq.read_table("data_00000.parquet")

Schema

Schema matches the per-shard sidecar parquet schema as defined in src/dolma/sidecar_manifest_fields.py:43-124 (data-attribution repo), plus the appended source_shard_path column. For label fields, the underlying classifier used both an "old" schema (label ids only) and a "new" schema (label ids + probability vectors); the concatenated table promotes nullable columns so rows from both schemas coexist.