add backward inplace for dygraph#35412
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zhiqiu merged 3 commits intoPaddlePaddle:developfrom Sep 8, 2021
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sneaxiy
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Sep 6, 2021
| paddle::framework::OpInfoMap::Instance().Get(op_type).infer_inplace_; | ||
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| if (infer_inplace) { | ||
| auto in_to_outs = infer_inplace(true); |
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Discussed offline, the parameter being true and false has no difference now.
AnnaTrainingG
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Sep 29, 2021
* add backward inplace for dygraph * fix bug * support gradient accumulation
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PR types
New features
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Describe
add backward inplace for dygraph
how
In dygraph mode, the forward part is not determined, while the backward computation graph is determined after forward. So the graph optimization can be performed. And, the reference count used to guide inplace optimization can be easily get
shared_ptrof input tensor.Two benefits: (1) reduce d2d copy and speed up training, (2) reduce memory usage
performance
GPT model, speed up +2.8%.
