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Reduce mem consumption of softmax backward

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This commit is contained in:
Daniel Povey 2023-05-16 12:18:09 +08:00
parent 465d41c429
commit bfeeddda81
1 changed files with 2 additions and 1 deletions
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egs/librispeech/ASR/pruned_transducer_stateless7/scaling.py
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@ -276,7 +276,8 @@ class SoftmaxFunction(torch.autograd.Function):
ans_grad = ans_grad.to(torch.float32)
ans = ans.to(torch.float32)
x_grad = ans_grad * ans
x_grad = x_grad - ans * x_grad.sum(dim=ctx.dim, keepdim=True)
ans *= x_grad.sum(dim=ctx.dim, keepdim=True)
x_grad -= ans
return x_grad, None