Neural Network Toolbox™

Conscience bias initialization function

Syntax

• b = initcon(s,pr)
  

Description

initcon is a bias initialization function that initializes biases for learning with the learncon learning function.

initcon (S,PR) takes two arguments,

S	Number of rows (neurons)
PR	R x 2 matrix of R = [Pmin Pmax] (default = [1 1])

and returns an S x 1 bias vector.

Note that for biases, R is always 1. initcon could also be used to initialize weights, but it is not recommended for that purpose.

Examples

Here initial bias values are calculated for a five-neuron layer.

• b = initcon(5)
  

Network Use

You can create a standard network that uses initcon to initialize weights by calling newc.

To prepare the bias of layer i of a custom network to initialize with initcon,

1. Set net.initFcn to 'initlay'. (net.initParam automatically becomes initlay's default parameters.)
2. Set net.layers{i}.initFcn to 'initwb'.
3. Set net.biases{i}.initFcn to 'initcon'.

To initialize the network, call init. See newc for initialization examples.

Algorithm

learncon updates biases so that each bias value b(i) is a function of the average output c(i) of the neuron i associated with the bias.

initcon gets initial bias values by assuming that each neuron has responded to equal numbers of vectors in the past.

See Also

initwb, initlay, init, learncon

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