Fix for invalid numpy float indexing

example/dec/dec.py

@@ -21,7 +21,7 @@ def cluster_acc(Y_pred, Y):
   D = max(Y_pred.max(), Y.max())+1
   w = np.zeros((D,D), dtype=np.int64)
   for i in range(Y_pred.size):
-    w[Y_pred[i], Y[i]] += 1
+    w[Y_pred[i], int(Y[i])] += 1
   ind = linear_assignment(w.max() - w)
   return sum([w[i,j] for i,j in ind])*1.0/Y_pred.size, w