Update basic.py

theano/tensor/basic.py

@@ -4223,7 +4223,7 @@ def roll(x, shift, axis=None):
         if x.ndim == 0:
             axis = 0
         else:
-            axis = axis % x.ndim + 1
+            axis = axis % x.ndim
 
     # Shift may be larger than the size of the axis. If so, since the
     # roll operation is cyclic, we can take the shift modulo the size