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由 GGBond8488 提交于
* add prim erf grad * add yaml config for prim erf grad * add math.h * add cmath * add math defines * use define math * use define math * define M_2_SQRTPI * M_2_SQRTPI math * try math.h * fix typro * remove pow in erf grad * use new optest * add fp16 fp32 test * remove fp16 test
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