tensorflow错误No module named 'num

>>> import tensorflow as tf
D:\anaconda\Lib\site-packages\numpy\__init__.py:140: UserWarning: mkl-service package failed to import, therefore Intel(R) MKL initialization ensuring its correct out-of-the box operation under condition when Gnu OpenMP had already been loaded by Python process is not assured. Please install mkl-service package, see http://github.com/IntelPython/mkl-service
  from . import _distributor_init
Traceback (most recent call last):
  File "D:\anaconda\Lib\site-packages\numpy\core\__init__.py", line 24, in <module>
    from . import multiarray
  File "D:\anaconda\Lib\site-packages\numpy\core\multiarray.py", line 14, in <module>
    from . import overrides
  File "D:\anaconda\Lib\site-packages\numpy\core\overrides.py", line 7, in <module>
    from numpy.core._multiarray_umath import (
ModuleNotFoundError: No module named 'numpy.core._multiarray_umath'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "D:\anaconda\envs\py3\lib\site-packages\tensorflow\__init__.py", line 41, in <module>
    from tensorflow.python.tools import module_util as _module_util
  File "D:\anaconda\envs\py3\lib\site-packages\tensorflow\python\__init__.py", line 48, in <module>
    import numpy as np
  File "D:\anaconda\Lib\site-packages\numpy\__init__.py", line 142, in <module>
    from . import core
  File "D:\anaconda\Lib\site-packages\numpy\core\__init__.py", line 54, in <module>
    raise ImportError(msg)
ImportError:

IMPORTANT: PLEASE READ THIS FOR ADVICE ON HOW TO SOLVE THIS ISSUE!

Importing the numpy c-extensions failed.
- Try uninstalling and reinstalling numpy.
- If you have already done that, then:
  1. Check that you expected to use Python3.8 from "D:\anaconda\envs\py3\python.exe",
     and that you have no directories in your PATH or PYTHONPATH that can
     interfere with the Python and numpy version "1.18.1" you're trying to use.
  2. If (1) looks fine, you can open a new issue at
     https://github.com/numpy/numpy/issues.  Please include details on:
     - how you installed Python
     - how you installed numpy
     - your operating system
     - whether or not you have multiple versions of Python installed
     - if you built from source, your compiler versions and ideally a build log

- If you're working with a numpy git repository, try `git clean -xdf`
  (removes all files not under version control) and rebuild numpy.

Note: this error has many possible causes, so please don't comment on
an existing issue about this - open a new one instead.

Original error was: No module named 'numpy.core._multiarray_umath'

原因：numpy版本不匹配
解决办法：

pip install numpy --upgrade

升级后就OK了

(py3) C:\Users\bxzyz>python
Python 3.8.5 (default, Aug  5 2020, 09:44:06) [MSC v.1916 64 bit (AMD64)] :: Anaconda, Inc. on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import tensorflow as tf
2020-08-12 15:11:55.747173: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library cudart64_101.dll
>>>