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Document Link（文档链接）

https://gitcode.com/cann/ops-transformer/blob/master/mhc/mhc_pre_backward/docs/aclnnMhcPreBackward.md

Issues Section（问题文档片段）

约束说明中，A2/A3产品支持的D的取值范围与正向不一致

Existing Issues（存在的问题）