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ANN - Artificial Neural Network for PHP 5.x

This page offers to download the current stable version of ANN implementation for PHP 5.x. Go to Installation section to get information about requirements and on how to implement these PHP libraries into your project.

Version 2.1.0 (2009-12-22) stable

Author: Thomas Wien

• Download - ann210.zip (27 KB)
• Download - ann210.tar.gz (15 KB)

Documentation

• Documentation (HTML online)

• Documentation (HTML download, zip compressed)

Change-Log

• Default learning rate to 0.7
• Code changes referring profiling
• Change printing network details formatting
• Remove trailing php end tag
• Code-Standard
• Remove momentum, precision and unused math methods
• Remove unused methods
• Remove error weight derivative
• Removing weight decay
• Removing dynamic learning rate
• Removing algorithm switches and experimental algorithms. Just standard back propagation algorithm used
• Renaming class file names
• Learning rate and delta using
• Using learning rate
• Rounding of network error value

Version 2.0.7 (2009-01-01) stable

Author: Thomas Wien

• Download - ann207.zip (32 KB)
• Download - ann207.tar.gz (34 KB)

Documentation

• Documentation (HTML online)

• Documentation (HTML download, zip compressed)

Change-Log

• Removing protected method ANN_Neuron::setOutput()
• Removing protected unused method ANN_Layer::getInputs()
• Removing protected unused property ANN_Layer::$arrInputs
• More detailed exceptions to ANN_Filesystem::saveToFile()
• Different distribution of activation calls across the layers
• Different adjustments in ANN_Neuron::adjustWeights() depending on output type
• Removing static local variables from ANN_Network::getNextIndexInputsToTrain()
• Increasing math precision
• Using class constants for output types (increasing performance)
• Fixing bug: ANN_Neuron::getOutput() is float and not array

Version 2.0.6 (2008-12-18) obsolete

Author: Thomas Wien

• Download - ann206.zip (30 KB)
• Download - ann206.tar.gz (33 KB)

Documentation

• Documentation (HTML download, zip compressed)

Change-Log

• Printing network details of output differences to their desired values
• Complete rewritten code standard of variables
• New class ANN_Values for defining input and output values
• Code examples to phpdoc
• Internal math precision defaults to 5

Version 2.0.5 (2008-12-16) obsolete

Author: Thomas Wien

• Download - ann205.zip (28 KB)
• Download - ann205.tar.gz (31 KB)

Documentation

• Documentation (HTML download, zip compressed)

Change-Log

• Adjustable output error tolerance between 0 and 10 per cent
• Internal rounding of floats for performance issues
• Loading class for all ANN classes (SPL autoload)
• Renaming filename of ANN_Maths class
• Improving code standard
• Fixing bug: Comparision in ANN_InputValue and ANN_OutputValue

Version 2.0.4 (2008-01-27) obsolete

Author: Thomas Wien

• Download - ann204.zip (25 KB)
• Download - ann204.tar.gz (29 KB)

Change-Log

• Weight decay
• QuickProp algorithm (experimental)
• RProp algorithm (experimental)
• Linear saturated activation function (experimental)
• Individual learning rate algorithm (experimental)
• Reducing of overfitting (no training if input pattern produces desired output)
• Increasing performance on activation
• Increasing performance on testing all patterns to their desired outputs
• Increasing performance on calculating hidden deltas
• Increasing performance by defining layer relation by construction
• More details to printNetwork()
• Fixing bug: learning rate is not part of saved delta value

Version 2.0.3 (2008-01-17) obsolete

Author: Thomas Wien

• Download - ann203.zip (22 KB)
• Download - ann203.tar.gz (20 KB)

Change-Log

• Support for dynamic learning rate
• Automatic epoch determination
• Automatic output type detection
• Shuffling input patterns each epoch instead of randomized pattern access
• Bug fix: runtime error on call of setMomentum()
• Logging of network errors
• Logging on each epoch instead of each training step
• Avoiding distributed internal calls of setMomentum() and setLearningRate()
• Extending display of network details

Version 2.0.2 (2008-01-14) obsolete

Author: Thomas Wien

• Download - ann202.zip (21 KB)
• Download - ann202.tar.gz (17 KB)

Change-Log

• Client-Server model for distributed applications
• Calculating total network error for csv logging

Version 2.0.1 (2008-01-06) obsolete

Author: Thomas Wien

• Download - ann201.zip (19 KB)
• Download - ann201.tar.gz (16 KB)

Change-Log

• Separation of classes to several files
• Version control by Subversion
• Performance issues
• Graphical output of neural network topology
• Logging of weights to csv file

Version 2.0.0 (2007-12-17) obsolete

Author: Thomas Wien

• Download - ann200.zip (6 KB)
• Download - ann200.tar.gz (6 KB)

Change-Log

• PHP 5.x support
• PHPDoc documentation
• Momentum support
• Avoiding network overfitting
• Linear / binary output
• ANN_InputValue + ANN_OutputValue classes
• Exceptions
• Threshold function
• Tangens hyperbolicus transfer function
• Several performance issues
• Avoiding array_keys() & srand() due to performance
• Changes in saving and loading network
• Printing network details to browser
• Fixing bug: initializing inputs to all hidden layers
• Fixing bug: training for first hidden layer was skipped

Version 1.0 (2002)

Author: Eddy Young

• Project page on freebsd.mu
• Download - ann100.zip (6 KB)

Change-Log

• Initial version