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Fix NaN for softmax with long softmax_dim. by Xreki · Pull Request #57851 · PaddlePaddle/Paddle · GitHub
Xreki
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Fix nan for softmax with long softmax_dim.
Fix NaN for softmax with long softmax_dim.
Sep 28, 2023
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Fix NaN for softmax with long softmax_dim. #57851
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你的PR提交成功，感谢你对开源项目的贡献! |
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ZzSean
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LGTM
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* Fix nan for softmax with long softmax_dim. * Simplify codes. * Remove the PADDLE_THROW in backward.
jiahy0825
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* Fix nan for softmax with long softmax_dim. * Simplify codes. * Remove the PADDLE_THROW in backward.
danleifeng
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* Fix nan for softmax with long softmax_dim. * Simplify codes. * Remove the PADDLE_THROW in backward.
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PR types
Bug fixes
PR changes
OPs
Description
Pcard-70459
softmax函数出现NaN #55685 ，softmax长维度分支、前向结果在小输入数据出现NaN问题。KeMatrixSoftmaxForward代码，主要包括以下几点：BatchSize模板，外层实际传入的为BlockDim，Kernel中实际并没有用到，增大了编译负担VecSize模板，对于每种数据类型，使用的VecSize是固定的，没有必要为多种VecSize特化switch的default分支添加报错信息；反向添加报错后，log_softmax算子单测会fail，待反向计算问题解决后再添加。