src/build_dynaword.py

#!/usr/bin/env python3
"""Build Polish DynaWord parquet shards from SpeakLeash .jsonl.zst sources.

Parallel pipeline (uses all cores). Per source (paper 2508.02271, minimal gates):
  stream jsonl.zst -> [workers: parse + Polish-lang check + drop-short +
  OCR alpha-ratio + tiktoken token_count + sha1] -> [main: cross-source exact
  dedup + id + parquet write].

Sources processed in priority order so earlier sources win duplicates
(wikipedia > wikisource > ...). Heavy quality filtering + mix-weighting are
downstream (CPT), not here. token_count is a fast tiktoken proxy (~1% off
Llama-3); canonical Llama-3 recount happens at release.

Usage:
  python3 src/build_dynaword.py --all --speakleash-dir ~/speakleash --out ~/dynaword
  python3 src/build_dynaword.py --sources gutenberg --jobs 16
"""
from __future__ import annotations
import argparse, hashlib, io, json, os, re, shutil, subprocess, sys, time
from itertools import islice
import multiprocessing as mp
from pathlib import Path
import pyarrow as pa
import pyarrow.parquet as pq

sys.path.insert(0, str(Path(__file__).resolve().parent))
from sources import SOURCES, ADDED

POLISH_RE = re.compile(r"[ąćęłńóśźżĄĆĘŁŃÓŚŹŻ]")
ALPHA_RE = re.compile(r"[^\W\d_]", re.UNICODE)
MIN_CHARS = 200
MIN_POLISH_RATIO = 0.005
MIN_ALPHA_RATIO = 0.70

SCHEMA = pa.schema([
    ("id", pa.string()), ("text", pa.string()), ("source", pa.string()),
    ("added", pa.string()), ("created", pa.string()), ("token_count", pa.int64()),
    ("license", pa.string()), ("author", pa.string()),
])

_ENC = None  # per-worker tiktoken encoder


def _init_worker():
    global _ENC
    import tiktoken
    _ENC = tiktoken.get_encoding("cl100k_base")


def _polish_ratio(text):
    letters = ALPHA_RE.findall(text)
    return len(POLISH_RE.findall(text)) / len(letters) if letters else 0.0


def _first_text(value) -> str:
    if value is None:
        return ""
    if isinstance(value, list):
        return "; ".join(str(item).strip() for item in value if str(item).strip())
    return str(value).strip()


def _meta_value(row: dict, keys: tuple[str, ...], default: str = "") -> str:
    for key in keys:
        value = _first_text(row.get(key))
        if value:
            return value
    return default


def _process_chunk(args):
    """Worker: gate + tokenize a batch of raw lines. Returns (records, stats)."""
    is_ocr, created, default_license, preserve_created, lines = args
    kept, texts = [], []
    st = [0, 0, 0, 0]  # read, short, lang, ocr
    metas = []
    for line in lines:
        st[0] += 1
        try:
            row = json.loads(line)
            text = (row.get("text") or "").strip()
        except Exception:
            continue
        if len(text) < MIN_CHARS:
            st[1] += 1; continue
        if _polish_ratio(text) < MIN_POLISH_RATIO:
            st[2] += 1; continue
        if is_ocr:
            ar = len(ALPHA_RE.findall(text)) / len(text) if text else 0.0
            if ar < MIN_ALPHA_RATIO:
                st[3] += 1; continue
        texts.append(text)
        metas.append((
            _meta_value(row, ("created", "date", "published", "publication_date"), created)
            if preserve_created else created,
            _meta_value(row, ("license", "licence", "rights", "edm:rights"), default_license),
            _meta_value(row, ("author", "authors", "creator", "creators")),
            _meta_value(row, ("id", "record_id")),
        ))
    toks = [len(t) for t in _ENC.encode_ordinary_batch(texts, num_threads=1)] if texts else []
    for t, (created_value, license_value, author, record_id), tk in zip(texts, metas, toks):
        kept.append((
            t, created_value, tk, license_value, author,
            hashlib.sha1(t.encode("utf-8")).digest(), record_id,
        ))
    return kept, st


def _chunks(iterable, n):
    it = iter(iterable)
    while batch := list(islice(it, n)):
        yield batch


def build_source(name, cfg, sl_dir, out_root, pool, seen, counter):
    src_path = sl_dir / f"{cfg.get('file_key', cfg.get('speakleash_key'))}.jsonl.zst"
    if not src_path.exists():
        print(f"  ! missing {src_path}"); return None
    out_dir = out_root / "data" / name
    out_dir.mkdir(parents=True, exist_ok=True)
    writer = pq.ParquetWriter(out_dir / f"{name}.parquet", SCHEMA, compression="zstd")
    st = {"read": 0, "kept": 0, "drop_short": 0, "drop_lang": 0,
          "drop_dup": 0, "drop_ocr": 0, "chars": 0, "tokens": 0,
          "licenses": {}, "authors_with_value": 0}
    t0 = time.time()
    is_ocr, created = bool(cfg.get("is_ocr")), cfg.get("created", "")
    preserve_id = bool(cfg.get("preserve_id"))
    preserve_created = bool(cfg.get("preserve_created"))
    used_ids = set()
    default_license = cfg.get("license", "")
    bid, btext, bcre, btok, blic, baut = [], [], [], [], [], []

    def flush():
        if not btext:
            return
        n = len(btext)
        writer.write(pa.record_batch([
            pa.array(bid), pa.array(btext), pa.array([name] * n),
            pa.array([ADDED] * n), pa.array(bcre), pa.array(btok, pa.int64()),
            pa.array(blic), pa.array(baut),
        ], schema=SCHEMA))
        bid.clear(); btext.clear(); bcre.clear(); btok.clear(); blic.clear(); baut.clear()

    proc = None
    stream = None
    compressed = None
    executable = shutil.which("zstd")
    if executable:
        proc = subprocess.Popen([executable, "-dc", str(src_path)],
                                stdout=subprocess.PIPE, bufsize=1 << 22)
        stream = proc.stdout
    else:
        try:
            import zstandard
        except ImportError as exc:
            raise RuntimeError(
                "reading .zst requires zstd or Python zstandard: pip install zstandard"
            ) from exc
        compressed = src_path.open("rb")
        stream = io.TextIOWrapper(
            zstandard.ZstdDecompressor().stream_reader(compressed), encoding="utf-8"
        )
    line_iter = (ln for ln in stream if ln.strip())
    arg_iter = ((is_ocr, created, default_license, preserve_created, ch)
                for ch in _chunks(line_iter, 2000))
    for kept, cst in pool.imap_unordered(_process_chunk, arg_iter, chunksize=1):
        st["read"] += cst[0]; st["drop_short"] += cst[1]
        st["drop_lang"] += cst[2]; st["drop_ocr"] += cst[3]
        for text, cre, tok, license_value, author, h, record_id in kept:
            if h in seen:
                st["drop_dup"] += 1; continue
            seen.add(h)
            output_id = record_id if preserve_id and record_id else f"{name}_{counter[0]}"
            if output_id in used_ids:
                raise ValueError(f"duplicate record id in {name}: {output_id}")
            used_ids.add(output_id)
            bid.append(output_id); counter[0] += 1
            btext.append(text); bcre.append(cre); btok.append(tok)
            blic.append(license_value); baut.append(author)
            st["chars"] += len(text); st["tokens"] += tok; st["kept"] += 1
            st["licenses"][license_value] = st["licenses"].get(license_value, 0) + 1
            if author:
                st["authors_with_value"] += 1
            if len(btext) >= 2000:
                flush()
    flush(); writer.close(); stream.close()
    if compressed is not None:
        compressed.close()
    if proc is not None:
        proc.wait()
    st["secs"] = round(time.time() - t0, 1)
    print(f"  {name}: read {st['read']:,} kept {st['kept']:,} | -short {st['drop_short']:,} "
          f"-lang {st['drop_lang']:,} -dup {st['drop_dup']:,} -ocr {st['drop_ocr']:,} | "
          f"{st['chars']/1e6:.0f}M chars, {st['tokens']/1e6:.1f}M tok | {st['secs']}s", flush=True)
    (out_dir / f"{name}.stats.json").write_text(json.dumps({**st, "license": cfg["license"]}, indent=2))
    return st


def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("--sources", nargs="*", default=None)
    ap.add_argument("--all", action="store_true")
    ap.add_argument("--speakleash-dir", default="~/speakleash")
    ap.add_argument("--out", default=".")
    ap.add_argument("--jobs", type=int, default=os.cpu_count())
    args = ap.parse_args()

    names = list(SOURCES) if args.all else (args.sources or [])
    if not names:
        print("specify --sources <names> or --all"); return
    sl_dir = Path(args.speakleash_dir).expanduser().resolve()
    out_root = Path(args.out).expanduser().resolve()
    print(f"jobs={args.jobs} | speakleash={sl_dir} | out={out_root} | sources={names}", flush=True)

    seen, counter, totals = set(), [0], []
    t0 = time.time()
    with mp.Pool(args.jobs, initializer=_init_worker) as pool:
        for name in names:
            if name not in SOURCES:
                print(f"  ? unknown {name}"); continue
            print(f"[{name}]", flush=True)
            st = build_source(name, SOURCES[name], sl_dir, out_root, pool, seen, counter)
            if st:
                totals.append((name, st))
    tt = sum(s["tokens"] for _, s in totals)
    td = sum(s["kept"] for _, s in totals)
    print(f"\nTOTAL: {td:,} docs, {tt/1e9:.2f}B tok (tiktoken proxy), "
          f"{len(seen):,} unique | wall {round(time.time()-t0,1)}s", flush=True)


if __name__ == "__main__":
    main()