23 lines
704 B
Matlab
23 lines
704 B
Matlab
function nnchecknumgrad(nn, x, y)
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epsilon = 1e-6;
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er = 1e-7;
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n = nn.n;
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for l = 1 : (n - 1)
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for i = 1 : size(nn.W{l}, 1)
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for j = 1 : size(nn.W{l}, 2)
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nn_m = nn; nn_p = nn;
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nn_m.W{l}(i, j) = nn.W{l}(i, j) - epsilon;
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nn_p.W{l}(i, j) = nn.W{l}(i, j) + epsilon;
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rand('state',0)
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nn_m = nnff(nn_m, x, y);
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rand('state',0)
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nn_p = nnff(nn_p, x, y);
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dW = (nn_p.L - nn_m.L) / (2 * epsilon);
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e = abs(dW - nn.dW{l}(i, j));
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assert(e < er, 'numerical gradient checking failed');
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end
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end
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end
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end
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