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Netlab Reference Manual demev2
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<H1> demev2
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Purpose
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Demonstrate Bayesian classification for the MLP.

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Synopsis
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<PRE>
demev2</PRE>


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Description
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A synthetic two class two-dimensional dataset <CODE>x</CODE> is sampled
from a mixture of four Gaussians.  Each class is
associated with two of the Gaussians so that the optimal decision
boundary is non-linear.
A 2-layer
network with logistic outputs is trained by minimizing the cross-entropy
error function with isotroipc Gaussian regularizer (one hyperparameter for
each of the four standard weight groups), using the scaled
conjugate gradient optimizer. The hyperparameter vectors <CODE>alpha</CODE> and
<CODE>beta</CODE> are re-estimated using the function <CODE>evidence</CODE>. A graph
is plotted of the optimal, regularised, and unregularised decision
boundaries.  A further plot of the moderated versus unmoderated contours
is generated.

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See Also
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<CODE><a href="evidence.htm">evidence</a></CODE>, <CODE><a href="mlp.htm">mlp</a></CODE>, <CODE><a href="scg.htm">scg</a></CODE>, <CODE><a href="demard.htm">demard</a></CODE>, <CODE><a href="demmlp2.htm">demmlp2</a></CODE><hr>
<b>Pages:</b>
<a href="index.htm">Index</a>
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<p>Copyright (c) Ian T Nabney (1996-9)


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author	wolffd
date	Tue, 10 Feb 2015 15:05:51 +0000
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