[PIR slice]Change deep_copy to share_buffer in eager backward #72966
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xiaoguoguo626807
approved these changes
May 28, 2025
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PR Category
Execute Infrastructure
PR Types
Improvements
Description
pcard-67164
Change deep_copy to share_buffer in eager backward
对于索引体系中单
Ellipsis,None,tuple()的getitem 反向计算，由于前向结果与前向输出share buffer且numel一致，因此反向梯度也是与初始梯度numel一致数值一致的tensor，可以不用再进行gpu拷贝构造，使用share buffer进行加速。该pr可以使这几种情况的加速比从10+降至1以内。