Fused softmax kernel #3496
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Fused softmax kernel #3496
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俊丞，这个优化起多大作用。什么场景会起作用。好像有的softmax和cross entropy loss 一起算，反向会得到简化 |
https://github.com/Oneflow-Inc/OneFlow-Benchmark/blob/master/LanguageModeling/BERT/bert.py#L230 ，这是针对bert的优化，bert每一层会有一个softmax。在2080ti上测试kernel执行时间，单位us
在2080ti上测试bert base大概有1~2%吞吐率的提升，不过 @ShawnXuan 在V100测试优化效果没有2080ti明显，还需要进一步测试，不确定是不是V100更快的问题 |
guo-ran
approved these changes
Aug 19, 2020
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