执行命令：pip install tensorflow_mlu-1.15.4-cp37-cp37m-linux_x86_64.whl

报错信息：

Traceback (most recent call last):

    File "<string>", line 1, in <module>

    File "/root/Cambricon/tensorflow_sdk1.7.0_v1.4.0/wheel/cambricon_virtualenv/lib/python3.7/site-packages/setuptools/__init__.py", line 19, in <module>

      from setuptools.dist import Distribution

    File "/root/Cambricon/tensorflow_sdk1.7.0_v1.4.0/wheel/cambricon_virtualenv/lib/python3.7/site-packages/_virtualenv.py", line 89, in exec_module

      old(module)

    File "/root/Cambricon/tensorflow_sdk1.7.0_v1.4.0/wheel/cambricon_virtualenv/lib/python3.7/site-packages/setuptools/dist.py", line 38, in <module>

      from setuptools import windows_support

    File "/root/Cambricon/tensorflow_sdk1.7.0_v1.4.0/wheel/cambricon_virtualenv/lib/python3.7/site-packages/setuptools/windows_support.py", line 2, in <module>

      import ctypes

    File "/usr/local/python3/lib/python3.7/ctypes/__init__.py", line 7, in <module>

      from _ctypes import Union, Structure, Array

  ModuleNotFoundError: No module named '_ctypes'