diff --git a/imperative/python/megengine/functional/tensor.py b/imperative/python/megengine/functional/tensor.py
index f08b5e67..320ed9da 100755
--- a/imperative/python/megengine/functional/tensor.py
+++ b/imperative/python/megengine/functional/tensor.py
@@ -1050,7 +1050,8 @@ def copy(inp, device=None):
 
     Examples:
 
-        >>> x = Tensor([1, 2, 3], numpy.int32)
+        >>> import numpy as np
+        >>> x = Tensor([1, 2, 3], np.int32)
         Tensor([1 2 3], dtype=int32, device=xpux:0)
 
         >>> F.copy(x, 'cpu1')