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def extract_sample_id(metadata):
"""
Best-effort extraction of a sample identifier from the metadata stored in
dataset info entries or collate_fn outputs.
"""
if metadata is None:
return None
if isinstance(metadata, dict):
sample_id = metadata.get("id") or metadata.get("sample_id")
if sample_id is not None:
return str(sample_id)
if isinstance(metadata, (list, tuple)):
for item in metadata:
sample_id = extract_sample_id(item)
if sample_id:
return sample_id
return None
if isinstance(metadata, (int, float)):
# treat bare numeric IDs as strings to keep files consistent
return str(int(metadata))
if isinstance(metadata, str):
return metadata.strip()
return None
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