[hybrid performance] optimize grad_add device#33946
Merged
wangxicoding merged 1 commit intoPaddlePaddle:developfrom Jul 5, 2021
Merged
[hybrid performance] optimize grad_add device#33946wangxicoding merged 1 commit intoPaddlePaddle:developfrom
wangxicoding merged 1 commit intoPaddlePaddle:developfrom
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PR types
Performance optimization
PR changes
Others
Describe
优化grad_add op的device属性，从使用对应梯度op的device变为生成对应梯度op的device。
效果，在pipeline并行中：
grad_add op切分到使用对应梯度op的上，在pipeline send/recv时会发送多个子梯度
grad_add op切分到生成对应梯度op的上，在pipeline send/recv时会发送最后累加的梯度
V100 32G，gpt2-en模型测试