conv3d.m

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function Xc = conv3d(X, f)
% the backpropagation function for conv3

assert(size(f,1) == 3)
assert(size(f,2) == 3)
assert(size(f,3) == 1)

Xc_full = conv2(X, f, 'full');
Xc = unpad1(Xc_full);