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1 <html>
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2 <head>
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3 <title>
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4 Netlab Reference Manual mdnfwd
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5 </title>
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6 </head>
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7 <body>
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8 <H1> mdnfwd
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9 </H1>
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10 <h2>
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11 Purpose
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12 </h2>
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13 Forward propagation through Mixture Density Network.
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14
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15 <p><h2>
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16 Synopsis
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17 </h2>
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18 <PRE>
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19 mixparams = mdnfwd(net, x)
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20 [mixparams, y, z] = mdnfwd(net, x)
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21 [mixparams, y, z, a] = mdnfwd(net, x)
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22 </PRE>
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23
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24
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25 <p><h2>
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26 Description
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27 </h2>
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28
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29 <CODE>mixparams = mdnfwd(net, x)</CODE> takes a mixture density network data
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30 structure <CODE>net</CODE> and a matrix <CODE>x</CODE> of input vectors, and forward
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31 propagates the inputs through the network to generate a structure
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32 <CODE>mixparams</CODE> which contains the parameters of several mixture models.
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33 Each row of <CODE>x</CODE> represents
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34 one input vector and the corresponding row of the matrices in <CODE>mixparams</CODE>
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35 represents the parameters of a mixture model for the conditional probability
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36 of target vectors given the input vector. This is not represented as an array
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37 of <CODE>gmm</CODE> structures to improve the efficiency of MDN training.
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38
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39 <p>The fields in <CODE>mixparams</CODE> are
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40 <PRE>
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41
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42 type = 'mdnmixes'
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43 ncentres = number of mixture components
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44 dimtarget = dimension of target space
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45 mixcoeffs = mixing coefficients
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46 centres = means of Gaussians: stored as one row per pattern
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47 covars = covariances of Gaussians
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48 nparams = number of parameters
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49 </PRE>
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50
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51
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52 <p><CODE>[mixparams, y, z] = mdnfwd(net, x)</CODE> also generates a matrix <CODE>y</CODE> of
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53 the outputs of the MLP and a matrix <CODE>z</CODE> of the hidden
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54 unit activations where each row corresponds to one pattern.
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55
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56 <p><CODE>[mixparams, y, z, a] = mlpfwd(net, x)</CODE> also returns a matrix <CODE>a</CODE>
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57 giving the summed inputs to each output unit, where each row
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58 corresponds to one pattern.
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59
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60 <p><h2>
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61 See Also
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62 </h2>
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63 <CODE><a href="mdn.htm">mdn</a></CODE>, <CODE><a href="mdn2gmm.htm">mdn2gmm</a></CODE>, <CODE><a href="mdnerr.htm">mdnerr</a></CODE>, <CODE><a href="mdngrad.htm">mdngrad</a></CODE>, <CODE><a href="mlpfwd.htm">mlpfwd</a></CODE><hr>
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64 <b>Pages:</b>
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65 <a href="index.htm">Index</a>
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66 <hr>
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67 <p>Copyright (c) Ian T Nabney (1996-9)
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68 <p>David J Evans (1998)
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69
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70 </body>
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71 </html> |
