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[BUG] Prefetcher is unrecoverable from exceptions in reset() #1550

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[BUG] Prefetcher is unrecoverable from exceptions in reset() #1550

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4 changes: 3 additions & 1 deletion torchdata/nodes/prefetch.py
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Original file line number Diff line number Diff line change
Expand Up @@ -34,9 +34,11 @@ def __init__(self, source: BaseNode[T], prefetch_factor: int, snapshot_frequency

def reset(self, initial_state: Optional[Dict[str, Any]] = None):
super().reset(initial_state)
if self._it is not None:
if hasattr(self, "_it") and self._it is not None:
self._it._shutdown()
del self._it

# This can throw, so _it may be deleted
self._it = _SingleThreadedMapper(
source=self.source,
prefetch_factor=self.prefetch_factor,
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