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first hg version after svn
| author | wolffd |
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| date | Tue, 10 Feb 2015 15:05:51 +0000 |
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| rev | line source |
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| wolffd@0 | 1 <html> |
| wolffd@0 | 2 <head> |
| wolffd@0 | 3 <title> |
| wolffd@0 | 4 Netlab Reference Manual mlpbkp |
| wolffd@0 | 5 </title> |
| wolffd@0 | 6 </head> |
| wolffd@0 | 7 <body> |
| wolffd@0 | 8 <H1> mlpbkp |
| wolffd@0 | 9 </H1> |
| wolffd@0 | 10 <h2> |
| wolffd@0 | 11 Purpose |
| wolffd@0 | 12 </h2> |
| wolffd@0 | 13 Backpropagate gradient of error function for 2-layer network. |
| wolffd@0 | 14 |
| wolffd@0 | 15 <p><h2> |
| wolffd@0 | 16 Synopsis |
| wolffd@0 | 17 </h2> |
| wolffd@0 | 18 <PRE> |
| wolffd@0 | 19 g = mlpbkp(net, x, z, deltas)</PRE> |
| wolffd@0 | 20 |
| wolffd@0 | 21 |
| wolffd@0 | 22 <p><h2> |
| wolffd@0 | 23 Description |
| wolffd@0 | 24 </h2> |
| wolffd@0 | 25 <CODE>g = mlpbkp(net, x, z, deltas)</CODE> takes a network data structure |
| wolffd@0 | 26 <CODE>net</CODE> together with a matrix <CODE>x</CODE> of input vectors, a matrix |
| wolffd@0 | 27 <CODE>z</CODE> of hidden unit activations, and a matrix <CODE>deltas</CODE> of the |
| wolffd@0 | 28 gradient of the error function with respect to the values of the |
| wolffd@0 | 29 output units (i.e. the summed inputs to the output units, before the |
| wolffd@0 | 30 activation function is applied). The return value is the gradient |
| wolffd@0 | 31 <CODE>g</CODE> of the error function with respect to the network |
| wolffd@0 | 32 weights. Each row of <CODE>x</CODE> corresponds to one input vector. |
| wolffd@0 | 33 |
| wolffd@0 | 34 <p>This function is provided so that the common backpropagation algorithm |
| wolffd@0 | 35 can be used by multi-layer perceptron network models to compute |
| wolffd@0 | 36 gradients for mixture density networks as well as standard error |
| wolffd@0 | 37 functions. |
| wolffd@0 | 38 |
| wolffd@0 | 39 <p><h2> |
| wolffd@0 | 40 See Also |
| wolffd@0 | 41 </h2> |
| wolffd@0 | 42 <CODE><a href="mlp.htm">mlp</a></CODE>, <CODE><a href="mlpgrad.htm">mlpgrad</a></CODE>, <CODE><a href="mlpderiv.htm">mlpderiv</a></CODE>, <CODE><a href="mdngrad.htm">mdngrad</a></CODE><hr> |
| wolffd@0 | 43 <b>Pages:</b> |
| wolffd@0 | 44 <a href="index.htm">Index</a> |
| wolffd@0 | 45 <hr> |
| wolffd@0 | 46 <p>Copyright (c) Ian T Nabney (1996-9) |
| wolffd@0 | 47 |
| wolffd@0 | 48 |
| wolffd@0 | 49 </body> |
| wolffd@0 | 50 </html> |