lambdacasserole/brainy

Neural network implementation in PHP, packaged for Composer.

v1.3 2017-01-30 15:16 UTC

BSD-3-Clause

• Saul Johnson

README

Neural network implementation in PHP, packaged for Composer.

Based heavily on the Tremani neural network by Edward Akerboom but stripped down, tidied up and packaged for Composer.

Installation

Install Brainy via Composer like this:

composer require lambdacasserole/brainy

Or alternatively, if you're using the PHAR (make sure the php.exe executable is in your PATH):

php composer.phar require lambdacasserole/brainy

Usage

Create a new neural network instance like this:

// Create a new neural network with 3 input neurons, one layer of 4 hidden neurons, and 1 output neuron.
$network = new NeuralNetwork(3, 4, 1);

Add training data to your new network thusly:

// Add training data to the network. In this case, we want the network to learn the 'XOR' function.
$network->addTrainingData([-1, -1, 1], [-1]);
$network->addTrainingData([-1, 1, 1], [1]);
$network->addTrainingData([1, -1, 1], [1]);
$network->addTrainingData([1, 1, 1], [-1]);

Then begin training:

// Train in a maximum of 1000 epochs to a maximum error rate of 0.01.
$success = $network->train(1000, 0.01);

Now put it to work:

$output = $network->calculate([-1, -1, 1]); // Gives [-1].
$output = $network->calculate([-1, 1, 1]); // Gives [1].

Compatibility

Uses new array syntax and splats, so won't work on any PHP versions earlier than 5.6.

Further Reading

The original repository contains more comprehensive documentation, though it may need adjusting slightly due to modifications made to it in this version.