neural network - What is gradInput and gradOutput in Torch7's 'nn' package? -

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hi starter of using torch's 'nn' package. in past 2 weeks, extremely confused meaning of gradinput , gradoutput in torch's 'nn' library. believe 'grad' here means gradient, 2 variables refers to?

thanks anyone's help!

gradoutput: gradient w.r.t. output of module. passed in either loss function, or module next current module. used compute gradient w.r.t. input (gradinput) , gradient w.r.t. parameters of module (gradweight / gradbias)


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