?? gtmmag.m
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function mags = gtmmag(net, latent_data)%GTMMAG Magnification factors for a GTM%% Description% MAGS = GTMMAG(NET, LATENTDATA) takes a GTM structure NET, and% computes the magnification factors for each point the latent space% contained in LATENTDATA.%% See also% GTM, GTMPOST, GTMLMEAN%% Copyright (c) Ian T Nabney (1996-2001)errstring = consist(net, 'gtm');if ~isempty(errstring) error(errstring);endJacs = rbfjacob(net.rbfnet, latent_data);nlatent = size(latent_data, 1);mags = zeros(nlatent, 1);temp = zeros(net.rbfnet.nin, net.rbfnet.nout);for m = 1:nlatent temp = squeeze(Jacs(m, :, :)); % Turn into a 2d matrix mags(m) = sqrt(det(temp*temp'));end
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