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MoeGatingTopKBackward算子VF累加问题，在VF内部一次规约后，后续累加使用串行累加而不是reduceSum累加。
Ascend950
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/assign @wkyan
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Describe the current behavior / 问题描述 (Mandatory / 必填)
MoeGatingTopKBackward算子VF累加问题，在VF内部一次规约后，后续累加使用串行累加而不是reduceSum累加。
Environment / 环境信息 (Mandatory / 必填)
Ascend950
Steps to reproduce the issue / 重现步骤 (Mandatory / 必填)
无
Describe the expected behavior / 预期结果 (Mandatory / 必填)
无
Related log / screenshot / 日志 / 截图 (Mandatory / 必填)
无
Special notes for this issue/备注 (Optional / 选填)