| """Download and verify public RefSeg-CA artifacts using Python's standard library.""" |
| from pathlib import Path |
| import argparse, gzip, hashlib, json, shutil, tarfile, urllib.request |
| ROOT = Path(__file__).resolve().parents[1] |
| REPO = 'Ethosoft/RefSeg-CA' |
|
|
|
|
| def fetch(base, name, cache, manifest): |
| out = cache / name; out.parent.mkdir(parents=True, exist_ok=True) |
| expected = manifest['files'][name]['sha256'] |
| if not out.exists() or hashlib.sha256(out.read_bytes()).hexdigest() != expected: |
| tmp = out.with_suffix(out.suffix + '.part') |
| with urllib.request.urlopen(base + '/' + name, timeout=120) as r, tmp.open('wb') as f: |
| shutil.copyfileobj(r, f) |
| assert hashlib.sha256(tmp.read_bytes()).hexdigest() == expected, name + ': checksum mismatch' |
| tmp.replace(out) |
| return out |
|
|
|
|
| def extract(path, dest): |
| with tarfile.open(path) as archive: |
| for m in archive.getmembers(): |
| target = (dest / m.name).resolve() |
| if not m.isfile() or not target.is_relative_to(dest.resolve()): |
| raise ValueError('Unsafe archive member: ' + m.name) |
| target.parent.mkdir(parents=True, exist_ok=True) |
| with archive.extractfile(m) as source, target.open('wb') as out: |
| shutil.copyfileobj(source, out) |
|
|
|
|
| def main(): |
| ap = argparse.ArgumentParser(); ap.add_argument('--revision', default='r3-data-v1') |
| ap.add_argument('--synthetic', action='store_true'); a = ap.parse_args() |
| base = f'https://huggingface.co/datasets/{REPO}/resolve/{a.revision}' |
| with urllib.request.urlopen(base + '/DATA_MANIFEST.json', timeout=60) as r: manifest = json.load(r) |
| cache = ROOT / 'build/downloads'; cache.mkdir(parents=True, exist_ok=True) |
| extract(fetch(base, 'results/primary-and-review-metrics.tar.gz', cache, manifest), ROOT) |
| for name in ['rich_synthetic', 'rich_scenes']: |
| p = fetch(base, 'manifests/' + name + '.jsonl.gz', cache, manifest) |
| out = ROOT / 'data' / (name + '.jsonl'); out.parent.mkdir(parents=True, exist_ok=True) |
| with gzip.open(p, 'rb') as r, out.open('wb') as f: shutil.copyfileobj(r, f) |
| if a.synthetic: |
| for seed in manifest['seeds']: |
| extract(fetch(base, f'archives/rich-seed-{seed}.tar.gz', cache, manifest), ROOT) |
| print(json.dumps({'status': 'DOWNLOADED_AND_VERIFIED', 'revision': a.revision, 'synthetic_images': a.synthetic})) |
|
|
|
|
| if __name__ == '__main__': main() |
|
|
