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#!/usr/bin/env bash
set -euo pipefail

PROJECT_DIR="${PROJECT_DIR:-/workspace/KAWK50M}"
CLEAN_DIR="${CLEAN_DIR:-data/clean-v2-full}"
TOKENIZER_DIR="${TOKENIZER_DIR:-artifacts/tokenizer-20k-v3}"
OUTPUT_DIR="${OUTPUT_DIR:-data/tokenized-v2-20b/initial}"
WORKERS="${WORKERS:-16}"

cd "${PROJECT_DIR}"
source "${PROJECT_DIR}/.venv/bin/activate"

if [[ -e "${OUTPUT_DIR}" ]]; then
  echo "Refusing to overwrite existing output: ${OUTPUT_DIR}" >&2
  exit 1
fi
mkdir -p "${OUTPUT_DIR}"

find "${CLEAN_DIR}" -maxdepth 1 -type f -name "train-*.jsonl" -print0 \
  | sort -z \
  | xargs -0 -r -P "${WORKERS}" -I '{}' bash -c '
      input="$1"
      output_dir="$2"
      tokenizer_dir="$3"
      stem="$(basename "${input%.jsonl}")"
      python -u -m scripts.tokenize_shard \
        --input "${input}" \
        --tokenizer-dir "${tokenizer_dir}" \
        --output "${output_dir}/${stem}.bin" \
        --batch-size 64
    ' _ '{}' "${OUTPUT_DIR}" "${TOKENIZER_DIR}"

python - "${OUTPUT_DIR}" <<'PY'
from __future__ import annotations

import json
import sys
from pathlib import Path

output_dir = Path(sys.argv[1])
parts = sorted(output_dir.glob("*.bin"))
metadata = [json.loads(path.with_suffix(".json").read_text(encoding="utf-8")) for path in parts]
summary = {
    "parts": len(parts),
    "tokens": sum(int(row["tokens"]) for row in metadata),
    "bytes": sum(int(row["bytes"]) for row in metadata),
    "documents_written": sum(int(row["documents_written"]) for row in metadata),
}
(output_dir / "manifest.json").write_text(
    json.dumps(summary, ensure_ascii=False, indent=2) + "\n",
    encoding="utf-8",
)
print(json.dumps(summary, ensure_ascii=False, indent=2))
PY