Optimize elementwise_add_grad op#32051
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Xreki merged 1 commit intoPaddlePaddle:developfrom Apr 3, 2021
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PR types
Performance optimization
PR changes
OPs
Describe
起因
SimpleElemwiseAddGradCUDAKernel的实现为拷贝dout的值到dx和dy中。然而，此处存在一处可优化点：即若dout与dx或dy复用了同一片地址，则无需多余拷贝。优化方案
dx_data与dout_data相同且当dy_data与dout_data不同时：只需要拷贝dout_data到dy_data即可。dx_data与dout_data不同且当dy_data与dout_data相同时：只需要拷贝dout_data到dx_data即可。dx_data和dy_data与dout_data都不同时：调用原SimpleElemwiseAddGradCUDAKernel。dx_data和dy_data与dout_data都相同时：什么都不用做。优化结果
elementwise_add_gradop耗时