changed mean boolean error (aimacode#325)

Chipe1 · norvig · commit 94e63cd7f214 · 2017-03-06T21:32:53.000-08:00
* changed mean boolean error

* Update learning.py
diff --git a/learning.py b/learning.py
@@ -33,7 +33,7 @@ def manhattan_distance(predictions, targets):
 
 
 def mean_boolean_error(predictions, targets):
-    return mean([(p != t) for p, t in zip(predictions, targets)])
+    return mean(int(p != t) for p, t in zip(predictions, targets))
 
 # ______________________________________________________________________________
 
