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    منبع مطلب : fit.net

    Function fitting neural network

    This MATLAB function returns a function fitting neural network with a hidden layer size of hiddenSizes.

    fitnet

    Function fitting neural network

    collapse all in page

    Syntax

    net = fitnet(hiddenSizes)

    net = fitnet(hiddenSizes,trainFcn)

    Description

    example

    net = fitnet(hiddenSizes) returns a function fitting neural network with a hidden layer size of hiddenSizes.

    example

    net = fitnet(hiddenSizes,trainFcn) returns a function fitting neural network with a hidden layer size of hiddenSizes and training function, specified by trainFcn.

    Examples

    collapse all

    Construct and Train a Function Fitting Network

    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 function fitting neural network with one hidden layer of size 10.

    net = fitnet(10); View the network. view(net)

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

    Train the network net using the training data.

    net = train(net,x,t);

    View the trained network.

    view(net)

    You can see that the sizes of the input and output are 1.

    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 = 1.4639e-04

    The default training algorithm for a function fitting network is Levenberg-Marquardt ( 'trainlm' ). Use the Bayesian regularization training algorithm and compare the performance results.

    net = fitnet(10,'trainbr');

    net = train(net,x,t);

    y = net(x);

    perf = perform(net,y,t)

    perf = 3.3416e-10

    The Bayesian regularization training algorithm improves the performance of the network in terms of estimating the target values.

    Input Arguments

    hiddenSizes — Size of the hidden layers

    collapse all

    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 | doubletrainFcn — 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 — Function fitting network

    collapse all network object

    Function fitting network, returned as a network object.

    Tips

    Function fitting is the process of training a neural network on a set of inputs in order to produce an associated set of target outputs. After you construct the network with the desired hidden layers and the training algorithm, you must train it using a set of training data. Once the neural network has fit the data, it forms a generalization of the input-output relationship. You can then use the trained network to generate outputs for inputs it was not trained on.

    Version History

    Introduced in R2010b

    See Also

    train | feedforwardnet | network | nftool | trainlm | perform

    Topics

    Fit Data with a Shallow Neural Network

    Neural Network Object Properties

    Neural Network Subobject Properties

    منبع مطلب : www.mathworks.com

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