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【pir backward】Passing the gradient output of tuple_pop between if_grad_grad and if_grad by xiaoguoguo626807 · Pull Request #71445 · PaddlePaddle/Paddle · GitHub
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【pir backward】Passing the gradient output of tuple_pop between if_grad_grad and if_grad #71445
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Merged
xiaoguoguo626807
merged 2 commits into
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xiaoguoguo626807:tuple_pop
Mar 7, 2025
Merged
【pir backward】Passing the gradient output of tuple_pop between if_grad_grad and if_grad #71445
xiaoguoguo626807
merged 2 commits into
PaddlePaddle:develop
from
xiaoguoguo626807:tuple_pop
Mar 7, 2025
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你的PR提交成功,感谢你对开源项目的贡献! |
zhangbo9674
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LGTM for executor
YqGe585
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May 7, 2025
…d_grad and if_grad (PaddlePaddle#71445) * add if_grad_grad gradient * modiy test_ifelse
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PR Category
Execute Infrastructure
PR Types
Bug fixes
Description
pcard-67164
if op 经过二阶微分后,二阶的if_grad_grad 前向op if_grad_1 中包含一个tuple_pop op, 该op 的输出被if_grad_1 中使用, if_grad_grad 理应产出相应的梯度,给二阶中的if_grad_2 用。 (要解决的问题)但是由于二阶的if_grad_2 和 if_grad_grad 属于无关的block, 想要获取梯度的访问权限,需要if_grad_grad 将梯度yield 出去,(设计限制) if op 要求 true_block 和false_block 需要yiled 相同的变量, 对于if_grad_grad 需要yield 的梯度,应该是两个block 的并集。 (矛盾点)但是在构造if_grad_grad 的两个block时,是无法互相访问变量,因此构造fake 的value 和type.
conf block