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NeuralNetwork is developed as subproject of u-db.org (public EEG database/EEG silent speech detection project) which is a prediction application using machine learning alghoritms(forwardpropagation/backpropagation and gradient descent).

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README.md

NeuralNetwork is developed as subproject of u-db.org (public EEG database/EEG silent speech detection project) which is a prediction application using machine learning alghoritms(forward/back propagation and batch gradient descent). While I was studying Andrew NG coursera machine learning course I have developed C/C++ version according to tutorials.During my study I have also implemented Fmincg octave source into C language which you can find in the src folder. As I am originally a java developer NeuralNetwork is one of my first C/C++ application so I advise you to use it with caution. Anyway I would like to inform you that I was able to use application in many cases without any problem (including Andrew NG examples or EEG data analysis) Application has multi core support (also OpenCL version included in GitHub) also you can save your existing results and continue from this results in your next training.

Parameters:

--help	This help info

-x	X(input) file path (just space delimiter accepted currently)

-y	Y(expected result) file path

-r	Rowcount of X or Y file (should be equal)

-c	Column count of X file (each row should have same count)

-n	Number of labels in Y file (how many expected result)

-t	Total layer count for neural network(including first and last layer)

-h	Hidden layer size (excluding bias unit)

-j	Number of cores(threads) on host pc

-i	Number of iteration for training

-l	Lambda value (multiplier for thetas)

-f	Scale input (arithmetic and geometric means will be applied using std)

-p	Do prediction for each input after training complete (0 for disable, 1 for enable, default 1)

-tp	Theta path. If you have previously saved a prediction result you can 	continue from this result by loading from file path. (-lt value should be 	set to 1)

-lt	Load previously saved thetas (prediction result)
	(0 for disable 1 for enable default 0) (-tp needs to be set)

-st	Save thetas (prediction result)(0 for disable 1 for enable default 1)

-test   test vs training percent, i.e. for 10 there will be 90% training and 10% test


Please see http://www.u-db.org for more details

Installation: Application using Posix threads so any linux machine should run without any problem.

After you download the source code, locate into Release folder:

cd NeuralNetwork/Release

make clean
make all

If your build successfully then you will see finished message, if not please inform me I will try to help.

Example Usage: application comes with sample input data. Again samples based on Andrew NG tutorial which contains various pixel data of numbers from 1 to 10 for image recognition. Since you train with more iterations you will notice that prediction rate will increase.

Running the samples (x.dat and y.dat file in release folder) you can copy below code:

 ./NeuralNetwork -x xShuffled.dat -y yShuffled.dat -r 5000 -c 400 -n 10 -t 3 -h 25 -i 10000 -l 0.00025 -p 1 -st 0 -j 4 -test 5

To increase the iteration and learning rate simply increase -i parameter. For performance increase -j parameter ideally matching your core count. And if you want to save results set -st parameter to 1. When training finish you will see an output mentioning “thetas_xxxx.dat file has been saved.” So for your next trainign copy “thetas_xxxx.dat” then set -lt to 1 and -tp to “thetas_xxxx.dat”. Then your params should look similar to below:

./NeuralNetwork -x x.dat -y y.dat -r 5000 -c 400 -n 10 -t 3 -h 25 -i 10 -l 1 -p 1 -st 1 -j 1 -lt 1 -tp  thetas_xxxx.dat

For other params you can run --help.

Performance: I have amd 8350 8 core processor overlocked to 4.6 ghz and 16 gb ram. On my system each neural calculation took: for single core: 410 ms for 8 core: 40 ms. If you have AMD gpu and OpenCL installed I recommend using NeuralNetworkOpenCL. (Ofcourse with caution!) On threadripper 100 iteration took 1 second for sample data using below command: ./NeuralNetwork -x xShuffled.dat -y yShuffled.dat -r 5000 -c 400 -n 10 -t 3 -h 25 -i 100 -l 0.00025 -p 1 -st 0 -j 32 -test 10

Memory: NeuralNetwork designed to handle EEG data so quite memory hungry. All inputs will be loaded into memory including hiddenlayer, error and delta values. Valgrind (memory leak tool for C++) reports no error and on my system it is using aroung 1gb memory for the sample data. I have also developed Cuda and MPI versions for large dataset to share every single iteration between machines. Soon I will be sharing them too.

Exception handling: There is not much exception handling,comments yet.

License: All code under BSD 2 license if you have conflict let me know I will do my best to help.

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NeuralNetwork is developed as subproject of u-db.org (public EEG database/EEG silent speech detection project) which is a prediction application using machine learning alghoritms(forwardpropagation/backpropagation and gradient descent).

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