Datasets:
File size: 2,715 Bytes
957610d | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | import argparse
import json
import os
import shutil
from pathlib import Path
def copy_or_link(src: Path, dst: Path, mode: str) -> None:
dst.parent.mkdir(parents=True, exist_ok=True)
if dst.exists():
return
if mode == "hardlink":
try:
os.link(src, dst)
return
except OSError:
pass
shutil.copy2(src, dst)
def main():
parser = argparse.ArgumentParser()
parser.add_argument("--src", default=".", help="Original hf_dataset directory")
parser.add_argument("--dst", default="../hf_dataset_sharded", help="Output sharded dataset directory")
parser.add_argument("--group-size", type=int, default=5000, help="Images per subdirectory")
parser.add_argument("--mode", choices=["copy", "hardlink"], default="hardlink")
args = parser.parse_args()
src = Path(args.src).resolve()
dst = Path(args.dst).resolve()
metadata_in = src / "metadata.jsonl"
metadata_out = dst / "metadata.jsonl"
if not metadata_in.exists():
raise FileNotFoundError(f"Cannot find {metadata_in}")
if dst.exists():
raise FileExistsError(f"{dst} already exists. Delete it first or choose another --dst.")
dst.mkdir(parents=True)
# Copy root files and folders except images/ and metadata.jsonl.
for item in src.iterdir():
if item.name in {"images", "metadata.jsonl"}:
continue
target = dst / item.name
if item.is_dir():
shutil.copytree(item, target)
else:
shutil.copy2(item, target)
count = 0
missing = []
with metadata_in.open("r", encoding="utf-8") as fin, metadata_out.open("w", encoding="utf-8", newline="\n") as fout:
for idx, line in enumerate(fin):
if not line.strip():
continue
row = json.loads(line)
old_rel = Path(row["file_name"].replace("\\", "/"))
old_img = src / old_rel
if not old_img.exists():
missing.append(str(old_rel))
continue
part_name = f"part-{idx // args.group_size:05d}"
new_rel = Path("images") / part_name / old_rel.name
new_img = dst / new_rel
copy_or_link(old_img, new_img, args.mode)
row["file_name"] = new_rel.as_posix()
fout.write(json.dumps(row, ensure_ascii=False) + "\n")
count += 1
print(f"Done. Wrote {count} samples to {dst}")
print(f"New metadata: {metadata_out}")
if missing:
print(f"Missing images: {len(missing)}")
for x in missing[:20]:
print(" ", x)
raise SystemExit(1)
if __name__ == "__main__":
main()
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