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author Daniel Wolff
date Fri, 19 Aug 2016 13:07:06 +0200
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Daniel@0 1 <html>
Daniel@0 2 <head>
Daniel@0 3 <title>
Daniel@0 4 Netlab Reference Manual rbfgrad
Daniel@0 5 </title>
Daniel@0 6 </head>
Daniel@0 7 <body>
Daniel@0 8 <H1> rbfgrad
Daniel@0 9 </H1>
Daniel@0 10 <h2>
Daniel@0 11 Purpose
Daniel@0 12 </h2>
Daniel@0 13 Evaluate gradient of error function for RBF network.
Daniel@0 14
Daniel@0 15 <p><h2>
Daniel@0 16 Synopsis
Daniel@0 17 </h2>
Daniel@0 18 <PRE>
Daniel@0 19
Daniel@0 20 g = rbfgrad(net, x, t)
Daniel@0 21 [g, gdata, gprior] = rbfgrad(net, x, t)
Daniel@0 22 </PRE>
Daniel@0 23
Daniel@0 24
Daniel@0 25 <p><h2>
Daniel@0 26 Description
Daniel@0 27 </h2>
Daniel@0 28 <CODE>g = rbfgrad(net, x, t)</CODE> takes a network data structure <CODE>net</CODE>
Daniel@0 29 together with a matrix <CODE>x</CODE> of input
Daniel@0 30 vectors and a matrix <CODE>t</CODE> of target vectors, and evaluates the gradient
Daniel@0 31 <CODE>g</CODE> of the error function with respect to the network weights (i.e.
Daniel@0 32 including the hidden unit parameters). The error
Daniel@0 33 function is sum of squares.
Daniel@0 34 Each row of <CODE>x</CODE> corresponds to one
Daniel@0 35 input vector and each row of <CODE>t</CODE> contains the corresponding target vector.
Daniel@0 36 If the output function is <CODE>'neuroscale'</CODE> then the gradient is only
Daniel@0 37 computed for the output layer weights and biases.
Daniel@0 38
Daniel@0 39 <p><CODE>[g, gdata, gprior] = rbfgrad(net, x, t)</CODE> also returns separately
Daniel@0 40 the data and prior contributions to the gradient. In the case of
Daniel@0 41 multiple groups in the prior, <CODE>gprior</CODE> is a matrix with a row
Daniel@0 42 for each group and a column for each weight parameter.
Daniel@0 43
Daniel@0 44 <p><h2>
Daniel@0 45 See Also
Daniel@0 46 </h2>
Daniel@0 47 <CODE><a href="rbf.htm">rbf</a></CODE>, <CODE><a href="rbffwd.htm">rbffwd</a></CODE>, <CODE><a href="rbferr.htm">rbferr</a></CODE>, <CODE><a href="rbfpak.htm">rbfpak</a></CODE>, <CODE><a href="rbfunpak.htm">rbfunpak</a></CODE>, <CODE><a href="rbfbkp.htm">rbfbkp</a></CODE><hr>
Daniel@0 48 <b>Pages:</b>
Daniel@0 49 <a href="index.htm">Index</a>
Daniel@0 50 <hr>
Daniel@0 51 <p>Copyright (c) Ian T Nabney (1996-9)
Daniel@0 52
Daniel@0 53
Daniel@0 54 </body>
Daniel@0 55 </html>