Maybe bug in cpu backward

[pkuyym]

for (int k = 0; k < dim; ++k) {
bottom_diff[i * dim + k * inner_num_ + j] *= w;
}
dim may should be channels?

[stormkingz]

@pkuyym I think you'are right

[mahaoyanghb]

I have checked this, I found dim=channels

[mahaoyanghb]

I have found a issue,

Backward_cpu
for (int k = 0; k < dim; ++k) {
bottom_diff[i * dim + k * inner_num_ + j] *= w;
}
should be
bottom_diff[i * dim + label_value * inner_num_ + j] *=w;