update xor label

Author: lazyprogrammer

supervised_class/perceptron.py

@@ -100,6 +100,7 @@ def score(self, X, Y):
     print ""
     print "XOR results:"
     X, Y = get_simple_xor()
+    Y[Y == 0] = -1
     model.fit(X, Y)
     print "XOR accuracy:", model.score(X, Y)