title: Cannot import sklearn.linear_model
body: <p>When I try to import sklearn.linear_model, I get this error:</p>
  
  <pre><code>In [1]: from sklearn import linear_model
  ---------------------------------------------------------------------------
  ImportError                               Traceback (most recent call last)
  &lt;ipython-input-1-a6ebbebad697&gt; in &lt;module&gt;()
  ----&gt; 1 from sklearn import linear_model
  
  /usr/local/lib/python2.7/dist-packages/sklearn/linear_model/__init__.py in &lt;module&gt;()
       15 from .least_angle import (Lars, LassoLars, lars_path, LarsCV, LassoLarsCV,
       16                           LassoLarsIC)
  ---&gt; 17 from .coordinate_descent import (Lasso, ElasticNet, LassoCV, ElasticNetCV,
       18                                  lasso_path, enet_path, MultiTaskLasso,
       19                                  MultiTaskElasticNet, MultiTaskElasticNetCV,
  
  /usr/local/lib/python2.7/dist-packages/sklearn/linear_model/coordinate_descent.py in &lt;module&gt;()
       27 from ..exceptions import ConvergenceWarning
       28 
  ---&gt; 29 from . import cd_fast
       30 
       31 
  
  ImportError: /usr/local/lib/python2.7/dist-packages/sklearn/linear_model/cd_fast.so: undefined symbol: ATL_dtger
  </code></pre>
  
  <p>I know it has something to do with Atlas, but I have no idea what. This exact code used to run smoothly on this very machine, and I do not know of any lib modification/installation.</p>
  
  <p>Thank you.</p>