ImportError: libcurand.so.9.0: cannot open shared object file: No such file or directory

hi! I install pytorch from conda:
conda install pytorch torchvision -c pytorch
when I import torch, I encounter the issue such as:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/user/anaconda3/envs/python2/lib/python2.7/site-packages/torch/__init__.py", line 80, in <module>
    from torch._C import *
ImportError: libcurand.so.9.0: cannot open shared object file: No such file or directory

how to solve it? thanks!