title: installed face_recognition, but cannot import. (Python3.64)
body: <pre><code>&gt;&gt;&gt; import face_recognition
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    File "/Users/username/Desktop/face_recognition_low/face_recognition.py", line 30, in &lt;module&gt;
      np.set_printoptions(threshold=np.nan)
    File "/Users/username/.virtualenvs/cv/lib/python3.6/site-packages/numpy/core/arrayprint.py", line 246, in set_printoptions
      floatmode, legacy)
    File "/Users/username/.virtualenvs/cv/lib/python3.6/site-packages/numpy/core/arrayprint.py", line 93, in _make_options_dict
      raise ValueError("threshold must be numeric and non-NAN, try "
  ValueError: threshold must be numeric and non-NAN, try sys.maxsize for untruncated representation
  </code></pre>
  
  <p>There was no problem importing face_recognition yesterday but all of sudden it does not work. I have no idea how to fix this problem... Any assistance would be highly appreciated. </p>
  
  <p>I restarted my mac and tried again now it works fine. I would like to figure out why...</p>
  
  <pre><code>&gt;&gt;&gt; import dlib
  &gt;&gt;&gt; import face_recognition 
  &gt;&gt;&gt;
  </code></pre>