print the max, mean, median, std absolute diff when debug mode see a difference in value.

theano/compile/debugmode.py

@@ -166,6 +166,11 @@ class BadOptimization(DebugModeError):
         else:
             print >> sio, "  New Value: ", str(self.new_r_val)
             
+        print >> sio, "  Max Abs Diff: ", numpy.max(numpy.absolute(self.new_r_val-self.old_r_val))
+        print >> sio, "  Mean Abs Diff: ", numpy.mean(numpy.absolute(self.new_r_val-self.old_r_val))
+        print >> sio, "  Median Abs Diff: ", numpy.median(numpy.absolute(self.new_r_val-self.old_r_val))
+        print >> sio, "  Std Abs Diff: ", numpy.std(numpy.absolute(self.new_r_val-self.old_r_val))
+
         print >> sio, "  Reason: ", str(self.reason)
         print >> sio, "  Old Graph:"
         print >> sio, self.old_graph