Modify the training set of Fig. 12.6 so that example b also includes the word nigeria (yet remains a negative example perhaps someone telling about their trip to Nigeria). Find a weight vector th at separates the positive and negative examples, using: (a) The basic training method of Section 12.2.1. (b) The Winnow method of Section 12.2.3.

Example 12.6:

Let us modify the training set of Fig. 12.6 to incorporate a sixth word that represents the negative of the threshold. The new data is shown in Fig. 12.8.

http://infolab.stanford.edu/~ullman/mmds/book.pdf

	and	viagra	the	of	nigeria		y
a	1	1	0	1	1	-1	+1
b	0	0	1	1	0	-1	-1
c	0	1	1	0	0	-1	+1
d	1	0	0	1	0	-1	-1
e	1	0	1	0	1	-1	+1
f	1	0	1	1	0	-1	-1