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为p_norm内核反向添加均分 #74524

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为p_norm内核反向添加均分 #74524

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6a831b2
fix norm max grad
cszdrg Aug 11, 2025
48e15b6
fix
cszdrg Aug 11, 2025
af29530
fix
cszdrg Aug 11, 2025
74d52c9
fix
cszdrg Aug 11, 2025
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16 changes: 14 additions & 2 deletions paddle/phi/kernels/gpu/p_norm_grad_kernel.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -35,8 +35,20 @@ struct AbsMaxAndMinGradFunctor {
DY* dy,
const Dim& dim,
int size) {
dx->device(place) = dy->broadcast(dim) * (*x).sign() *
((*x).abs() == y->broadcast(dim)).template cast<T>();
using MT = typename phi::dtype::MPTypeTrait<T>::Type;
auto abs_x = (*x).abs().template cast<MT>();
auto y_bc = y->broadcast(dim).template cast<MT>();
auto dy_bc = dy->broadcast(dim).template cast<MT>();
auto mask = (abs_x == y_bc).template cast<MT>();

Eigen::array<int, 1> reduce_dim = {static_cast<int>(dim.size() - 1)};
auto shape1 = (*x).dimensions();
shape1[shape1.size() - 1] = 1;
auto shape2 = (*x).dimensions();
for (size_t i = 0; i < shape2.size() - 1; i++) shape2[i] = 1;
auto count = mask.sum(reduce_dim).reshape(shape1).broadcast(shape2);

dx->device(place) = (dy_bc * (*x).sign() * mask / count).template cast<T>();
}
};

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