title: RandomForestClassifier import
body: <p>I've installed Anaconda Python distribution with scikit-learn.
  While importing RandomForestClassifier:</p>
  
  <p><code>from sklearn.ensemble import RandomForestClassifier</code></p>
  
  <p>I have the following error:</p>
  
  <p><code>File "C:\Anaconda\lib\site-packages\sklearn\tree\tree.py", line 36, in &lt;module&gt;
      from . import _tree
  ImportError: cannot import name _tree</code></p>
  
  <p>What the problem can be there?</p>