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Subject: Re: chess and neural networks

Author: Landon Rabern

Date: 10:13:43 07/02/03

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On July 02, 2003 at 02:18:48, Dann Corbit wrote:

>On July 02, 2003 at 02:03:20, Landon Rabern wrote:
>[snip]
>>I made an attempt to use a NN for determining extensions and reductions.  It was
>>evolved using a GA, kinda worked, but I ran out of time. to work on it at the
>>end of school and don't have my computer anymore. The problem is that the NN is
>>SLOW, even using x/(1+|x|) for activation instead of tanh(x).
>
>Precompute a hyperbolic tangent table and store it in an array.  Speeds it up a
>lot.

Well, x/(1+|x|) is as fast or faster than a large table lookup.  The slowdown
was from all the looping necessary for the feedforward.

Landon



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