Daniel@0: Daniel@0: Daniel@0: Daniel@0: Netlab Reference Manual nethess Daniel@0: Daniel@0: Daniel@0: Daniel@0:

nethess Daniel@0:

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Daniel@0: Purpose Daniel@0:

Daniel@0: Evaluate network Hessian Daniel@0: Daniel@0:

Daniel@0: Synopsis Daniel@0:

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Daniel@0: h = neterr(w, net, x, t)
Daniel@0: [h, varargout] = neterr(w, net, x, t, varargin)
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Daniel@0: Description Daniel@0:

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h = nethess(w, net, x, t) takes a weight vector w and a network Daniel@0: data structure net, together with the matrix x of input Daniel@0: vectors and the matrix t of target vectors, and returns the Daniel@0: value of the Hessian evaluated at w. Daniel@0: Daniel@0:

[e, varargout] = nethess(w, net, x, t, varargin) also returns any additional Daniel@0: return values from the network Hessian function, and passes additional arguments Daniel@0: to that function. Daniel@0: Daniel@0:

Daniel@0: Example Daniel@0:

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In evidence, this function is called once to compute the Daniel@0: data contribution to the Hessian Daniel@0:

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Daniel@0: [h, dh] = nethess(w, net, x, t, dh);
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Daniel@0: Daniel@0: and again to update the Hessian for new values of the hyper-parameters Daniel@0:

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Daniel@0: h = nethess(w, net, x, t, dh);
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Daniel@0: See Also Daniel@0:

Daniel@0: neterr, netgrad, netopt

Daniel@0: Pages: Daniel@0: Index Daniel@0:

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