ah4h+@andrew.cmu.edu (Andrew Hudson) (10/19/87)
This is in response to a query for connectionist simulator code. Within a month, one of the most comprehensive back propagation simulators will be available to the general public. Jay McClelland and David Rumelhart's third PDP publication, Exploring Parallel Distributed Processing: A Handbook of Models, Programs, and Exercises will be available from MIT Press. C source code for the complete backprop simulator, as well as others, is supplied on two MS-DOS format 5 1/4" floppy discs. The simulator, called BP, comes with the necessary files to run encoder, xor, and other problems. It supports multiple layer networks, constrained weight, and sender to receiver options. It also has nicely laid out and nicely parsed menu options for every parameter you could ever imagine. The handbook and source code can be ordered from MIT Press at the address below. The cost for both is less than $30. Why spend thousands more for second best? The MIT Press 55 Hayward Street Cambridge, MA 02142 Another version of the BP simulator which is not yet generally available to the public has been modified to take full advantage of the vector architecture of the Convex mini-supercomputer. For certain applications this gives speed increases of 30 times that of a VAX 11/780. A study is underway to see how well BP will perform on a CRAY XMP-48. - Andrew Hudson ah4h@andrew.cmu.edu.arpa Department of Psychology Carnegie Mellon 412-268-3139 Bias disclaimor: I work for Jay, I've seen the code.