Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!ncar!gatech!hubcap!ncrcae!usceast!fenimore
From: fenimore@usceast.UUCP (Fred Fenimore)
Newsgroups: comp.ai.neural-nets
Subject: Re: PDP programs not working for large nets?
Keywords: Neural Nets, PDP, pa
Message-ID: <2730@usceast.UUCP>
Date: 23 Feb 89 00:00:26 GMT
References: <539@tekno.chalmers.se>
Reply-To: fenimore@usceast.UUCP (Fred Fenimore)
Organization: University of South Carolina, Columbia
Lines: 45

In article <539@tekno.chalmers.se> d83_sven_a@tekno.chalmers.se (Sven (Sciz) Axelsson) writes:
>I and a college of mine are trying to learn something about neural networks
>and PDP, and so we wanted to use the PDP programs from 'Explorations...
>(PDP Book 3)' as a starting point.
 
   ... (some stuff deleted about the fact that it resulted in an error)

>well, or have we done anything wrong? This is what the network definition
>looks like:
>
>	definitions:
>	nunits 360
>	ninputs 180
>	noutputs 180
>	end
>	network:
>	%r  180 180 0 180
>	 ^^^^^^^^^^^^^^^^

  This past fall, I was in a special topics course on Neural Nets.  As 
part of the course, we were to implement some type of project using one
of the simulators availible.  What we found with ours was that if you 
use BP or PA, then you cannot use the block commands in the .net file.
We tried it on a Vax 11/725 and a Apollo.  Both machines gave either
a segmentation fault or out of memory error. We spent some time looking
in the various files to see if we could find the error and to confirm
that it was a real bug in the code or what.  The semester ended with
no results so I gave up and coded the project in C. 
We have not had time lately with all the new classes to find out where 
in the source code this error is coming up.
  Hope this helps...
     Fred Fenimore


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