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Function Approximation and Nonlinear Regression

Create a neural network to generalize nonlinear relationships between example inputs and outputs

Apps

Neural Net FittingFit data by training a two-layer feed-forward network

Functions

nnstartNeural network getting started GUI
viewView neural network
fitnetFunction fitting neural network
feedforwardnetFeedforward neural network
cascadeforwardnetCascade-forward neural network
trainTrain neural network
trainlmLevenberg-Marquardt backpropagation
trainbrBayesian regularization backpropagation
trainscgScaled conjugate gradient backpropagation
trainrpResilient backpropagation
mseMean squared normalized error performance function
regressionLinear regression
ploterrhistPlot error histogram
plotfitPlot function fit
plotperformPlot network performance
plotregressionPlot linear regression
plottrainstatePlot training state values
genFunctionGenerate MATLAB function for simulating neural network

Examples and How To

Basic Design

Fit Data with a Shallow Neural Network

Train a shallow neural network to fit a data set.

Create, Configure, and Initialize Multilayer Neural Networks

Prepare a multilayer neural network.

Train and Apply Multilayer Neural Networks

Train and use a multilayer network for function approximation or pattern recognition.

Analyze Shallow Neural Network Performance After Training

Analyze network performance and adjust training process, network architecture, or data.

Deploy Trained Neural Network Functions

Simulate and deploy trained neural networks using MATLAB® tools.

Deploy Training of Neural Networks

Learn how to deploy training of a network.

Training Scalability and Efficiency

Neural Networks with Parallel and GPU Computing

Use parallel and distributed computing to speed up neural network training and simulation and handle large data.

Automatically Save Checkpoints During Neural Network Training

Save intermediate results to protect the value of long training runs.

Optimize Neural Network Training Speed and Memory

Make neural network training more efficient.

Optimal Solutions

Representing Unknown or Don't-Care Targets

Choose Neural Network Input-Output Processing Functions

Preprocess inputs and targets for more efficient training.

Configure Neural Network Inputs and Outputs

Learn how to manually configure the network before training using the configure function.

Divide Data for Optimal Neural Network Training

Use functions to divide the data into training, validation, and test sets.

Choose a Multilayer Neural Network Training Function

Comparison of training algorithms on different problem types.

Improve Neural Network Generalization and Avoid Overfitting

Learn methods to improve generalization and prevent overfitting.

Train Neural Networks with Error Weights

Learn how to use error weighting when training neural networks.

Normalize Errors of Multiple Outputs

Learn how to fit output elements with different ranges of values.

Concepts

Workflow for Neural Network Design

Learn the primary steps in a neural network design process.

Four Levels of Neural Network Design

Learn the different levels of using Neural Network Toolbox functionality.

Multilayer Neural Networks and Backpropagation Training

Workflow for designing a multilayer feedforward neural network for function fitting and pattern recognition.

Multilayer Neural Network Architecture

Learn the architecture of a multilayer neural network.

Understanding Neural Network Toolbox Data Structures

Learn how the format of input data structures affects the simulation of networks.

Neural Network Object Properties

Learn properties that define the basic features of a network.

Neural Network Subobject Properties

Learn properties that define network details such as inputs, layers, outputs, targets, biases, and weights.

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