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MhcPostBackward在处理极值时，gradHout和gradX的结果和golden不一致，根本原因是因为实现中累加顺序和golden的累加顺序不一致
/assign @gcw_2XKemcvz
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Backgroud（背景信息）
MhcPostBackward在处理极值时，gradHout和gradX的结果和golden不一致，根本原因是因为实现中累加顺序和golden的累加顺序不一致
Benefit / Necessity （价值/作用）
Design（设计方案）