havBpNet:J

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Consulting a Network

Once we have trained a network, we need to be able to use it. This means that we need to be able to consult the network with some input pattern and retrieve the network’s response to that pattern. A network’s response is typically retrieved from the output layer (or layers) of the network.

In general, network consultation proceeds in a manner very similar to network training except that...

• each input pattern is only processed one time,
  
• we typically do not have expected responses for the input patterns used for network consultation, and
  
• typically we are more interested in the network’s response to an input pattern than in its error.

For each input pattern used to consult the network, we will typically use the following steps:

• present the input pattern to the input layer(s),
  
• feed the data forward through the layers, and
  
• retrieve the resulting network response at the output layer(s).

The havBpLayer class provides two methods for retrieving the output response of a network.

It is the user’s responsibility, if using the GetValue(...) method to retrieve an array of values, to ensure that the array passed as an argument contains at least as many elements as there are nodes in the layer.

What we do with the network response for a particular input pattern is, of course, application specific.

Retrieving Errors during Network Consultation

There may be times when one wishes to consult a restored network with input patterns for which the expected responses are known in order to determine how well the network responds. This may be accomplished by presenting expected response data and Training the network during consultation making sure that weigt updates have been disabled as shown in the Training Overview.

Intro    Network Classes Overview    Data Classes Overview    Packages

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