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by @thinksoso
Groupnorm是速度瓶颈
在测速时,发现与pytorch相比速度过慢

绕过Groupnorm之后,速度提升几十倍,可以证明是groupnorm的问题

by @BBuf
需要做得精细一点,即使Group Norm被绕过但还是慢了一点,可以profile看看具体哪里慢了,可以和白夏颖交流。
意思就是你不用关心GN,在OneFlow和PyTorch都不用GN的情况下寻找一下为什么OneFlow还是慢一点,参考:https://github.com/Oneflow-Inc/OneTeam/issues/1020
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