[Cherry-pick ] to Release/2.3, Add prefetch_factor in dataloader #43674
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heavengate
approved these changes
Jun 21, 2022
ZeyuChen
approved these changes
Jun 21, 2022
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PR types
New features
PR changes
APIs
Describe
在 DataLoader 中增加了 prefetch_factor 参数，允许 Dataloader 预加载一定数量的 batch，避免 io 阻塞。
prefeatch_num=2, num_workers=0 的实验结果：
prefeatch_num=1001, num_workers=0 的实验结果：
可以发现：设置了 prefeatch_num 后，训练出现卡顿的情况大量减少了