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author Daniel Wolff
date Fri, 19 Aug 2016 13:07:06 +0200
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Daniel@0 1 <html>
Daniel@0 2 <head>
Daniel@0 3 <title>
Daniel@0 4 Netlab Reference Manual demgmm4
Daniel@0 5 </title>
Daniel@0 6 </head>
Daniel@0 7 <body>
Daniel@0 8 <H1> demgmm4
Daniel@0 9 </H1>
Daniel@0 10 <h2>
Daniel@0 11 Purpose
Daniel@0 12 </h2>
Daniel@0 13 Demonstrate density modelling with a Gaussian mixture model.
Daniel@0 14
Daniel@0 15 <p><h2>
Daniel@0 16 Synopsis
Daniel@0 17 </h2>
Daniel@0 18 <PRE>
Daniel@0 19 demgmm4</PRE>
Daniel@0 20
Daniel@0 21
Daniel@0 22 <p><h2>
Daniel@0 23 Description
Daniel@0 24 </h2>
Daniel@0 25
Daniel@0 26 The problem consists of modelling data generated
Daniel@0 27 by a mixture of three Gaussians in 2 dimensions with a mixture model
Daniel@0 28 using full covariance matrices. The priors are 0.3, 0.5 and 0.2; the
Daniel@0 29 centres are (2, 3.5), (0, 0) and (0,2); the variances are (0.16, 0.64)
Daniel@0 30 axis aligned, (0.25, 1) rotated by 30 degrees and the identity
Daniel@0 31 matrix. The first figure contains a scatter plot of the data.
Daniel@0 32
Daniel@0 33 <p>A Gaussian mixture model with three components is trained using EM. The
Daniel@0 34 parameter vector is printed before training and after training. The user
Daniel@0 35 should press any key to continue at these points. The parameter vector
Daniel@0 36 consists of priors (the column), and centres (given as (x, y) pairs as
Daniel@0 37 the next two columns). The covariance matrices are printed separately.
Daniel@0 38
Daniel@0 39 <p>The second figure is a 3 dimensional view of the density function,
Daniel@0 40 while the third shows the axes of the 1-standard deviation ellipses
Daniel@0 41 for the three components of the mixture model.
Daniel@0 42
Daniel@0 43 <p><h2>
Daniel@0 44 See Also
Daniel@0 45 </h2>
Daniel@0 46 <CODE><a href="gmm.htm">gmm</a></CODE>, <CODE><a href="gmminit.htm">gmminit</a></CODE>, <CODE><a href="gmmem.htm">gmmem</a></CODE>, <CODE><a href="gmmprob.htm">gmmprob</a></CODE>, <CODE><a href="gmmunpak.htm">gmmunpak</a></CODE><hr>
Daniel@0 47 <b>Pages:</b>
Daniel@0 48 <a href="index.htm">Index</a>
Daniel@0 49 <hr>
Daniel@0 50 <p>Copyright (c) Ian T Nabney (1996-9)
Daniel@0 51
Daniel@0 52
Daniel@0 53 </body>
Daniel@0 54 </html>