title: ModuleNotFoundError: No module named 'tensorflow_core.estimator' for tensorflow 2.1.0
body: <p>When using tensorflow, I have the following error messages</p>
  <pre><code>ERROR:root:Internal Python error in the inspect module.
  Below is the traceback from this internal error.'
  
  File &quot;&lt;frozen importlib._bootstrap&gt;&quot;, line 1006, in _gcd_import
    File &quot;&lt;frozen importlib._bootstrap&gt;&quot;, line 983, in _find_and_load
    File &quot;&lt;frozen importlib._bootstrap&gt;&quot;, line 965, in _find_and_load_unlocked
  ModuleNotFoundError: No module named 'tensorflow_core.estimator'
  </code></pre>
  <p>The installed tensorflow related packages are shown as following. Do I need to update the estimator's version? If that's the case, how to install the estimator with right version?</p>
  <p><a href="https://i.stack.imgur.com/1iGd8.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/1iGd8.jpg" alt="enter image description here" /></a></p>