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function sae = saetrain(sae, x, opts)
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for i = 1 : numel(sae.ae);
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disp(['Training AE ' num2str(i) '/' num2str(numel(sae.ae))]);
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sae.ae{i} = nntrain(sae.ae{i}, x, x, opts);
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t = nnff(sae.ae{i}, x, x);
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x = t.a{2};
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%remove bias term
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x = x(:,2:end);
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end
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end
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