title: ImportError: cannot import name choice when importing sklearn.mixture
body: <p>I am using scikit learn 0.15.0. When I try to import sklearn.mixture I get
  ImportError: cannot import name choice</p>
  
  <p>Any ideas?</p>
  
  <p>===================================================================</p>
  
  <pre><code>In [1]: **from sklearn import mixture**
  
  ImportError                               Traceback (most recent call last)
  &lt;ipython-input-1-05bc76cab98d&gt; in &lt;module&gt;()
  ----&gt; 1 from sklearn import mixture
  
  /home/f/anaconda/lib/python2.7/site-packages/sklearn/mixture/__init__.py in &lt;module&gt;()
        3 """
        4
  ----&gt; 5 from .gmm import sample_gaussian, log_multivariate_normal_density
        6 from .gmm import GMM, distribute_covar_matrix_to_match_covariance_type
        7 from .gmm import _validate_covars
  
  /home/f/anaconda/lib/python2.7/site-packages/sklearn/mixture/gmm.py in &lt;module&gt;()
       16 from ..utils import check_random_state, deprecated
       17 from ..utils.extmath import logsumexp, pinvh
  ---&gt; 18 from .. import cluster
       19
       20 from sklearn.externals.six.moves import zip
  
  /home/f/anaconda/lib/python2.7/site-packages/sklearn/cluster/__init__.py in &lt;module&gt;()
        4 """
        5
  ----&gt; 6 from .spectral import spectral_clustering, SpectralClustering
        7 from .mean_shift_ import mean_shift, MeanShift, estimate_bandwidth, \
        8     get_bin_seeds
  
  /home/f/anaconda/lib/python2.7/site-packages/sklearn/cluster/spectral.py in &lt;module&gt;()
       16 from ..neighbors import kneighbors_graph
       17 from ..manifold import spectral_embedding
  ---&gt; 18 from .k_means_ import k_means
       19
       20
  
  /home/f/anaconda/lib/python2.7/site-packages/sklearn/cluster/k_means_.py in &lt;module&gt;()
       28 from ..utils import as_float_array
       29 from ..utils import gen_batches
  ---&gt; 30 from ..utils.random import choice
       31 from ..externals.joblib import Parallel
       32 from ..externals.joblib import delayed
  
  ImportError: cannot import name choice
  </code></pre>