Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!seas.gwu.edu!fc174103
From: fc174103@seas.gwu.edu (Burr)
Newsgroups: comp.ai.neural-nets
Subject: PDP's backprop program - Limit on number of units?
Message-ID: <2370@sparko.gwu.edu>
Date: 24 Nov 90 21:28:37 GMT
Reply-To: fc174103@seas.gwu.edu (Burr)
Distribution: na
Organization: The George Washington University, Washington D.C.
Lines: 12

I'm using the backpropagation program that comes with the PDP books.
I'm trying to train a network with 45 units (20 input, 15 hidden, and
10 output), to recognize the digits 0 thru 9.  I've set up a template
file that uses 132 columns by 43 lines to display appropriate info
about the network while it is being trained.  The display works fine
and does not seem to be the thing which is hanging the network up.  The
network hangs when I try to train it using the ptrain or strain commands.
It even hangs when I use the reset command.  While these commands do not
work the tall command, which just computes activations without changing
the weights, does work.  I'm not sure what is the problem.  Is 45 units
pushing the limit of this backprop program?  If anyone has had experience
with this program I would much appreciate any help you could offer.