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thresholdGradV2D适配Ascend950 Ascendc实现
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Backgroud（背景信息）
thresholdGradV2D适配Ascend950 Ascendc实现
Origin（信息来源）
thresholdGradV2D适配Ascend950 Ascendc实现
Benefit / Necessity （价值/作用）
Design（设计方案）