sustaining_gazes/matlab_version/face_validation/DeepLearnToolbox/NN/nnchecknumgrad.m

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2016-04-28 21:40:36 +02:00
function nnchecknumgrad(nn, x, y)
epsilon = 1e-6;
er = 1e-7;
n = nn.n;
for l = 1 : (n - 1)
for i = 1 : size(nn.W{l}, 1)
for j = 1 : size(nn.W{l}, 2)
nn_m = nn; nn_p = nn;
nn_m.W{l}(i, j) = nn.W{l}(i, j) - epsilon;
nn_p.W{l}(i, j) = nn.W{l}(i, j) + epsilon;
rand('state',0)
nn_m = nnff(nn_m, x, y);
rand('state',0)
nn_p = nnff(nn_p, x, y);
dW = (nn_p.L - nn_m.L) / (2 * epsilon);
e = abs(dW - nn.dW{l}(i, j));
assert(e < er, 'numerical gradient checking failed');
end
end
end
end