cascadeforwardnet

Generate cascade-forward neural network

Syntax

net = cascadeforwardnet(hiddenSizes,trainFcn)

Description

net = cascadeforwardnet(hiddenSizes,trainFcn) returns a cascade-forward neural network with a hidden layer size of hiddenSizes and training function, specified by trainFcn.

Cascade-forward networks are similar to feedforward networks, but include a connection from the input and every previous layer to following layers.

As with feedforward networks, a two-or more layer cascade-network can learn any finite input-output relationship arbitrarily well given enough hidden neurons.

Examples

Construct and Train a Cascade-Forward Neural Network

This example shows how to use a cascade-forward neural network to solve a simple problem.

Load the training data.

[x,t] = simplefit_dataset;

The 1-by-94 matrix x contains the input values and the 1-by-94 matrix t contains the associated target output values.

Construct a cascade-forward network with one hidden layer of size 10.

net = cascadeforwardnet(10);

Train the network net using the training data.

net = train(net,x,t);

View the trained network.

view(net)

Estimate the targets using the trained network.

y = net(x);

Assess the performance of the trained network. The default performance function is mean squared error.

perf = perform(net,y,t)

perf = 
1.9372e-05

Input Arguments

hiddenSizes — Size of the hidden layers

10 (default) | row vector

Size of the hidden layers in the network, specified as a row vector. The length of the vector determines the number of hidden layers in the network.

Example: For example, you can specify a network with 3 hidden layers, where the first hidden layer size is 10, the second is 8, and the third is 5 as follows: [10,8,5]

The input and output sizes are set to zero. The software adjusts the sizes of these during training according to the training data.

Data Types: single | double

trainFcn — Training function name

'trainlm' (default) | 'trainbr' | 'trainbfg' | 'trainrp' | 'trainscg' | ...

Training function name, specified as one of the following.

Training Function	Algorithm
'trainlm'	Levenberg-Marquardt
'trainbr'	Bayesian Regularization
'trainbfg'	BFGS Quasi-Newton
'trainrp'	Resilient Backpropagation
'trainscg'	Scaled Conjugate Gradient
'traincgb'	Conjugate Gradient with Powell/Beale Restarts
'traincgf'	Fletcher-Powell Conjugate Gradient
'traincgp'	Polak-Ribiére Conjugate Gradient
'trainoss'	One Step Secant
'traingdx'	Variable Learning Rate Gradient Descent
'traingdm'	Gradient Descent with Momentum
'traingd'	Gradient Descent

Example: For example, you can specify the variable learning rate gradient descent algorithm as the training algorithm as follows: 'traingdx'

For more information on the training functions, see Train and Apply Multilayer Shallow Neural Networks and Choose a Multilayer Neural Network Training Function.

Data Types: char

Output Arguments

net — Cascade-forward network

network object

Cascade-forward neural network, returned as a network object.

Version History

Introduced in R2010b