Homework 4 socket closed.. with two extra credit problems..

Folks:
 I added an additional part to the Seinfeld party problem (part I)--which is about naive bayes classifiers.

I also added the long promised dyanamic bayes net problem.

Both of these are made "extra-credit" and optional.

No more changes will be made to the homework. It will be due in class on Tuesday.

cheers,
Rao