Winnow
•x’s elements have binary values.
•Find weights.  Classify x by whether wTx > 1 or wTx < 1.
•Algorithm requires that there exist weights u, such that:
–uTx > 1 when f(x) = 1
–uTx < 1 – d when f(x) = 0.
–That is, there is a margin of d.