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fix MPRS request index cycle #1311

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fix MPRS request index cycle #1311

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3 changes: 1 addition & 2 deletions torchdata/dataloader2/communication/iter.py
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Original file line number Diff line number Diff line change
Expand Up @@ -431,17 +431,16 @@ def __iter__(self):
disabled_pipe[res_idx] = True
cnt_disabled_pipes += 1
disabled = True
req_idx = next(req_idx_cycle)
else:
# Only request if buffer is empty and has not reached the limit
if len(self.res_buffers[res_idx]) == 0 and (
self._limit is None or self._request_cnt < self._limit
):
self.datapipes[req_idx].protocol.request_next()
req_idx = next(req_idx_cycle)
self._request_cnt += 1
total_req_cnt += 1
total_res_cnt += 1
req_idx = next(req_idx_cycle)
res_idx = next(res_idx_cycle)
if not disabled:
yield response.value
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