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Neg n_workers are now the same as zero #4019

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Merged
apaszke merged 3 commits into from
Dec 5, 2017
Merged

Neg n_workers are now the same as zero #4019

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ca2565a
Neg n_workers are now the same as zero
Erotemic Dec 4, 2017
9ec9be1
negative num_workers now raises a ValueError
Erotemic Dec 5, 2017
cb44b81
Moved num_workers ValueError
Erotemic Dec 5, 2017
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4 changes: 4 additions & 0 deletions torch/utils/data/dataloader.py
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Original file line number Diff line number Diff line change
Expand Up @@ -361,6 +361,10 @@ def __init__(self, dataset, batch_size=1, shuffle=False, sampler=None, batch_sam
if sampler is not None and shuffle:
raise ValueError('sampler is mutually exclusive with shuffle')

if self.num_workers < 0:
raise ValueError('num_workers cannot be negative; '
'use num_workers=0 to disable multiprocessing.')

if batch_sampler is None:
if sampler is None:
if shuffle:
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