Copper users: Homework 5 won't
work right on Copper because the %r (randomize weights)
command doesn't execute properly. See the newly added comments on Homework 5.
March 11:
Homework 4A, Question 2C: The
question asks why all the output nodes are near zero when the input
pattern is 1111. It turns out that the output nodes are not
always all near zero on every training run, but, on most training
runs, the output nodes will be nearer to zero than to one. To answer
the question, suppose that all the output activations are
near zero when the input pattern is 1111.
March 11:
bp on copper does not work;
instead use bp.hacked. That is, instead of typing
"bp 424.tem 424.str", type "bp.hacked 424.tem 424.str" (after you have
copied the program into your own directory).
February 11:
Homework 2 due date is postponed until
Tuesday Feb. 18.
January 16:
Homework may be turned in via
e-mail to Matthias, it you like. E-mail homework is
preferred, but not required.
January 16:
The PDP software is available
on the Unix machine, copper, in directories under /usr/pub/pdp/. You
can get your
account on copper via the web.