| |
| """Download pinned evidence, verify SHA-256, and extract the raw reads. |
| |
| Uses only the Python standard library. --lens also downloads the 3.25 GB |
| five-prompt checkpoint; ordinary offline rescoring needs only the raw archive. |
| """ |
| import argparse |
| import hashlib |
| import json |
| from pathlib import Path, PurePosixPath |
| import shutil |
| import tarfile |
| import urllib.request |
|
|
| ROOT = Path(__file__).resolve().parents[1] |
|
|
|
|
| def sha(path): |
| h = hashlib.sha256() |
| with path.open('rb') as f: |
| for chunk in iter(lambda: f.read(8 << 20), b''): |
| h.update(chunk) |
| return h.hexdigest() |
|
|
|
|
| def fetch(repo, revision, entry): |
| path = ROOT / entry['path'] |
| if path.is_file() and sha(path) == entry['sha256']: |
| return path |
| path.parent.mkdir(parents=True, exist_ok=True) |
| url = f'https://huggingface.co/datasets/{repo}/resolve/{revision}/{entry["path"]}' |
| temp = path.with_suffix(path.suffix + '.part') |
| print('Downloading', entry['path'], flush=True) |
| with urllib.request.urlopen(url, timeout=120) as response, temp.open('wb') as f: |
| shutil.copyfileobj(response, f, length=8 << 20) |
| if sha(temp) != entry['sha256']: |
| temp.unlink() |
| raise SystemExit('Download checksum mismatch: ' + entry['path']) |
| temp.replace(path) |
| return path |
|
|
|
|
| def main(): |
| parser = argparse.ArgumentParser(description=__doc__) |
| parser.add_argument('--out', type=Path, default=ROOT / 'evidence') |
| parser.add_argument('--lens', action='store_true') |
| args = parser.parse_args() |
| release = json.loads((ROOT / 'provenance/release.json').read_text()) |
| if not release['hf_revision'] or len(release['hf_revision']) != 40: |
| raise SystemExit('A pinned 40-character dataset revision is required') |
| artifacts = json.loads((ROOT / 'provenance/artifacts.json').read_text()) |
| archive = fetch(release['hf_repo'], release['hf_revision'], artifacts['raw_reads']) |
| expected = {r['path']: r for r in json.loads((ROOT / 'provenance/evidence_files.json').read_text())} |
| args.out.mkdir(parents=True, exist_ok=True) |
| seen = set() |
| with tarfile.open(archive, 'r:gz') as t: |
| for member in t: |
| name = PurePosixPath(member.name) |
| if (not member.isfile() or name.is_absolute() or '..' in name.parts |
| or member.name not in expected or member.name in seen): |
| raise SystemExit('Unexpected archive member') |
| dest = args.out.joinpath(*name.parts) |
| if not dest.resolve().is_relative_to(args.out.resolve()): |
| raise SystemExit('Archive output escapes the evidence directory') |
| dest.parent.mkdir(parents=True, exist_ok=True) |
| with t.extractfile(member) as source, dest.open('wb') as f: |
| shutil.copyfileobj(source, f) |
| if sha(dest) != expected[member.name]['sha256']: |
| raise SystemExit('Extracted file checksum mismatch: ' + member.name) |
| seen.add(member.name) |
| if seen != set(expected): |
| raise SystemExit('Archive is missing expected observations') |
| print('Verified and extracted', len(seen), 'evidence files to', args.out) |
| if args.lens: |
| if release.get('checkpoint_available') is False: |
| raise SystemExit('Raw evidence is ready. The lens checkpoint upload is still in progress; update this checkout before using --lens.') |
| fetch(release['hf_repo'], release['hf_revision'], artifacts['pile5_lens']) |
| print('Verified the five-prompt checkpoint') |
|
|
|
|
| if __name__ == '__main__': |
| main() |
|
|
