Brief overview of backward and forward
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Let’s say we only feed in one data point.
- out = model:forward(
xi ) computesfw(xi) wherefw is our model with its current parametersw , and stores the result in out. - loss = criterion:forward(out,
yi ) computes the lossℓ(fw(xi),yi) with respect to the true valueyi . - dl_dout = criterion:backward(out,
yi ) computes∂ℓ(...)∂fw(xi) . - model:backward(
xi , dl_dout) computes∂ℓ(...)∂w and stores this gradient in a place we have a reference to, usually called gradParameters in our code.
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