Neural Nets

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Forthcoming Releases:

Fuzzy Logic:

Neural Net:
Release of NXL3


Neural Net Developments

We currently offer 3 neural network software programs:

  1. NXL is a C language implementation of a neural net which learning algorithm and structure are closely inspired from Scott Fahlman's QuickProp.  It has been written in C and compiled on the form of a DLL for use with VBA, for instance Microsoft Excel, hence the name NXL.  Sample spreadsheets are provided with VBA code.
  2. WinSOM is a Windows based Kohonen SOM developed in C++.  It offers 2D mapping capabilities, and is particularly easy to use.
  3. VB BackProp is a small Visual Basic utility for neural net novices who are familiar with Excel and VBA.  The program differs from many existing neural net utilities as it gives the user a lot of levers to better apprehend the training process.  While it can be used as is for small neural modeling applications, it is recommended to acquire the VBA code, to better customize it to your application environment.

Please note that VB BackProp will no longer be updated.  All emphasis is now put on our NXL library.

Notes on NXL (2005)

NXL has now been converted to NXL2 with a more detailed API.  NXL2 has been recompiled using Microsoft Visual C, which brings new API declarations.  The VB code remains unchanged, hence this will not affect your work.  There are a few additional functions and accessors to make your neural nets "lean and mean".  Many neural nets do not generalize well on account of "neuronal glut", and it is always advisable to build smaller nets.

Please also note the following:

  1. There is a silly bug in 'Average Test Error' calculation in current NXL.  It will not be fixed in NXL, but has been fixed in NXL2.  For users who wish to stay with NXL, please use TotalTestError which is correct, then of course divide it by the number of patterns in your set;
  2. The new API calls are listed here;
  3. All calculations have been changed to 'double' precision;
  4. A new user protection scheme is in place with NXL2.  New codes will be needed for existing users.  Upgrade is obviously free of charge for existing registered users.
  5. new sample spreadsheets are available on the download page.
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Page last modified: December 09, 2007
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