{
  "schema": "polocrbench-train-pool-v1.5",
  "pages": 3610,
  "by_source": {
    "docatlas-pl-clean": 1713,
    "impact-hist-train": 298,
    "polocrbench-synth": 1200,
    "polocrbench-synth-photo": 300,
    "handwriting-notes": 40,
    "handwriting-mednotes": 49,
    "handwriting-gardnotes": 10
  },
  "by_split": {
    "train": 3405,
    "development": 205
  },
  "synth_doc_types": {
    "faktura": 375,
    "umowa": 375,
    "pismo_urzedowe": 375,
    "formularz": 375
  },
  "photo_degradation_pages": 300,
  "documents": 2273,
  "tables_annotations": 1072,
  "kie_annotations": 1500,
  "dropped_dedup": 1,
  "dropped_pii": 0,
  "overlap_flags_by_set": {
    "history-print-test-a": 0,
    "history-fullpage-dev-v4": 0,
    "history-line-corpus-v2": 208,
    "ehri-printed-replay": 0
  },
  "human_verified": 0,
  "gold": 0,
  "licenses": {
    "docatlas-pl-clean": "CC BY 4.0 (Heakl et al. 2026, arXiv:2605.12623)",
    "impact-hist-train": "CC BY 3.0 (IMPACT Centre of Competence / PSNC)",
    "polocrbench-synth": "CC BY 4.0 (project-authored, generation.json seed 20260922)",
    "polocrbench-synth-photo": "CC BY 4.0 (project-authored, generation.json seed 20261018, photo recipe)",
    "handwriting-notes": "CC BY 4.0 (author: Piotr Styła)",
    "handwriting-mednotes": "CC BY 4.0 (license holder: Piotr Styła)",
    "handwriting-gardnotes": "CC BY 4.0 (license holder: Piotr Styła)"
  },
  "limitations": [
    "No labels are human-verified or gold; this is a user-directed training pool.",
    "PII label scan applied to real sources only; synthetic identities are generated.",
    "Overlap screening bounded to the four frozen local eval manifests in overlap-report.json; corpus-v2 flags are train-train identity by design (see overlap_interpretation).",
    "Historical texts are line transcriptions joined per page (order as in train_regions.jsonl)."
  ],
  "overlap_interpretation": {
    "history-line-corpus-v2": "all 208 flags hit only TRAIN pages of the frozen corpus v2 (the same source works, 65 of them intentionally shared via the psnc subset); zero flags against its validation/test splits - no leakage",
    "others": "zero flags"
  },
  "kie_real_pages": 45,
  "kie_real_fields": {
    "nip": 29,
    "konto": 0,
    "daty": 6,
    "kwoty": 20
  },
  "handwriting_pages": 40,
  "handwriting_orientation_normalized": 16,
  "handwriting_author": "Piotr Styła (self-licensed, CC BY 4.0, 2026-10-17)",
  "handwriting_transcription": "AI pre-annotation incl. drawing descriptions; author may verify",
  "handwriting_mednotes_pages": 49,
  "handwriting_mednotes_license": "CC BY 4.0 (license holder: Piotr Styła)",
  "handwriting_mednotes_content": "study/training notes with medical knowledge (dosage schedules, disease patterns as taught); no personal health records; mostly page fragments with cut edges",
  "handwriting_gardnotes_pages": 10,
  "handwriting_gardnotes_license": "CC BY 4.0 (license holder: Piotr Styła)",
  "handwriting_gardnotes_content": "garden journal 1988-89 on yellowed paper; plant/variety lists with strike-outs, weather table, gardening log; one re-scan pair kept as rescanning variety (rescan_group field)"
}