| """Load one checksum-verified histogram locally or from a Hugging Face dataset.""" |
| import argparse |
| import csv |
| import hashlib |
| from pathlib import Path |
|
|
| import h5py |
|
|
|
|
| def main(): |
| parser = argparse.ArgumentParser(description=__doc__) |
| source = parser.add_mutually_exclusive_group() |
| source.add_argument('--root', type=Path, default=Path(__file__).resolve().parents[1]) |
| source.add_argument('--repo-id', help='Published Hugging Face dataset ID: owner/name') |
| parser.add_argument('--revision', default='main', help='Use a commit hash for reproducibility') |
| parser.add_argument('--source', choices=['synthetic', 'experimental'], default='experimental') |
| parser.add_argument('--fold', help='For example: fold_1') |
| parser.add_argument('--split', choices=['train', 'validation', 'test', 'unassigned']) |
| args = parser.parse_args() |
|
|
| def resolve(filename): |
| if args.repo_id: |
| from huggingface_hub import hf_hub_download |
| return Path(hf_hub_download(repo_id=args.repo_id, filename=filename, |
| repo_type='dataset', revision=args.revision)) |
| return args.root / filename |
|
|
| with resolve('manifest.csv').open(newline='') as handle: |
| row = next((r for r in csv.DictReader(handle) |
| if r['source'] == args.source |
| and (not args.fold or r['fold'] == args.fold) |
| and (not args.split or r['split'] == args.split)), None) |
| if row is None: |
| parser.error('No sample matches the requested source, fold, and split') |
| filename = resolve(row['path']) |
| if hashlib.sha256(filename.read_bytes()).hexdigest() != row['sha256']: |
| raise ValueError(f'Checksum mismatch: {filename}') |
| with h5py.File(filename, 'r') as handle: |
| histogram = handle[row['h5_key']][()] |
| expected_shape = tuple(int(row[k]) for k in ('height', 'width', 'bins')) |
| if histogram.shape != expected_shape or str(histogram.dtype) != row['dtype']: |
| raise ValueError(f'Schema mismatch: {filename}') |
| print(f"{row['path']}\nlabel={row['label_name']} ({row['label']}), " |
| f"fold={row['fold'] or 'none'}, split={row['split']}\n" |
| f"shape={histogram.shape}, dtype={histogram.dtype}, sha256=verified") |
|
|
|
|
| if __name__ == '__main__': |
| main() |
|
|
