[Cherry-pick] fix affine_channel no_need buffer bug #18849
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sneaxiy
changed the title
zhhsplendid
reviewed
Jul 26, 2019
| !HasInput(framework::GradVarName("Bias"))) { | ||
| std::unordered_set<std::string> operator()() const override { | ||
| if (!HasOutput(framework::GradVarName("Scale")) && | ||
| !HasOutput(framework::GradVarName("Bias"))) { |
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Since, Out = Scale*X + Bias, do we have to have X's data when computing Bias@Grad?
Can we write:
if (!HasOutput(framework::GradVarName("Scale"))) {
return {"X"};
}
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Same comment as develop branch.
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Discussed offline, the OP calculates Scale@Grad and Bias@Grad at the same time. In other words, the two Grads must occur at the same time. The PR LGTM
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Cherry-pick #18844.