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annotate toolboxes/FullBNT-1.0.7/netlab3.3/netgrad.m @ 0:e9a9cd732c1e tip

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first hg version after svn
author wolffd
date Tue, 10 Feb 2015 15:05:51 +0000
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wolffd@0 1 function g = netgrad(w, net, x, t)
wolffd@0 2 %NETGRAD Evaluate network error gradient for generic optimizers
wolffd@0 3 %
wolffd@0 4 % Description
wolffd@0 5 %
wolffd@0 6 % G = NETGRAD(W, NET, X, T) takes a weight vector W and a network data
wolffd@0 7 % structure NET, together with the matrix X of input vectors and the
wolffd@0 8 % matrix T of target vectors, and returns the gradient of the error
wolffd@0 9 % function evaluated at W.
wolffd@0 10 %
wolffd@0 11 % See also
wolffd@0 12 % MLP, NETERR, NETOPT
wolffd@0 13 %
wolffd@0 14
wolffd@0 15 % Copyright (c) Ian T Nabney (1996-2001)
wolffd@0 16
wolffd@0 17 gradstr = [net.type, 'grad'];
wolffd@0 18
wolffd@0 19 net = netunpak(net, w);
wolffd@0 20
wolffd@0 21 g = feval(gradstr, net, x, t);