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<html><head><title>Netlab Reference Manual gtminit</title></head><body><H1> gtminit</H1><h2>Purpose</h2>Initialise the weights and latent sample in a GTM.<p><h2>Synopsis</h2><PRE>net = gtminit(net, options, data, samptype)net = gtminit(net, options, data, samptype, lsampsize, rbfsampsize)</PRE><p><h2>Description</h2><CODE>net = gtminit(net, options, data, samptype)</CODE> takes a GTM <CODE>net</CODE>and generates a sample of latent data points and sets the centres (andwidths if appropriate) of<CODE>net.rbfnet</CODE>. <p>If the <CODE>samptype</CODE> is <CODE>'regular'</CODE>, then regular grids of latentdata points and RBF centres are created. The dimension of the latent data space must be1 or 2. For one-dimensional latent space, the <CODE>lsampsize</CODE> parametergives the number of latent points and the <CODE>rbfsampsize</CODE> parametergives the number of RBF centres. For a two-dimensional latent space,these parameters must be vectors of length 2 with the number of pointsin each of the x and y directions to create a rectangular grid. Thewidths of the RBF basis functions are set by a call to <CODE>rbfsetfw</CODE>passing <CODE>options(7)</CODE> as the scaling parameter.<p>If the <CODE>samptype</CODE> is <CODE>'uniform'</CODE> or <CODE>'gaussian'</CODE> then thelatent data is found by sampling from a uniform orGaussian distribution correspondingly. The RBF basis function parametersare setby a call to <CODE>rbfsetbf</CODE> with the <CODE>data</CODE> parameteras dataset and the <CODE>options</CODE> vector.<p>Finally, the output layer weights of the RBF are initialised bymapping the mean of the latent variable to the mean of the target variable,and the L-dimensional latent variale variance to the variance of thetargets along the first L principal components.<p><h2>See Also</h2><CODE><a href="gtm.htm">gtm</a></CODE>, <CODE><a href="gtmem.htm">gtmem</a></CODE>, <CODE><a href="pca.htm">pca</a></CODE>, <CODE><a href="rbfsetbf.htm">rbfsetbf</a></CODE>, <CODE><a href="rbfsetfw.htm">rbfsetfw</a></CODE><hr><b>Pages:</b><a href="index.htm">Index</a><hr><p>Copyright (c) Ian T Nabney (1996-9)</body></html>?? 快捷鍵說明
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