title: Error importing scikit-learn modules
body: <p>I'm trying to call a function from the cluster module, like so:</p>
  
  <pre><code>import sklearn
  db = sklearn.cluster.DBSCAN()
  </code></pre>
  
  <p>and I get the following error:</p>
  
  <pre><code>AttributeError: 'module' object has no attribute 'cluster'
  </code></pre>
  
  <p>Tab-completing in IPython, I seem to have access to the base, clone, externals, re, setup_module, sys, and warning modules.  Nothing else, though others (including cluster) are in the sklearn directory.</p>
  
  <p>Following pbu's advice below and using</p>
  
  <pre><code>from sklearn import cluster
  </code></pre>
  
  <p>I get:</p>
  
  <pre><code>Traceback (most recent call last):
    File "test.py", line 2, in &lt;module&gt;
      from sklearn import cluster
    File "C:\Python34\lib\site-packages\sklearn\cluster\__init__.py", line 6, in &lt;module&gt;
      from .spectral import spectral_clustering, SpectralClustering
    File "C:\Python34\lib\site-packages\sklearn\cluster\spectral.py", line 13, in &lt;module&gt;
      from ..utils import check_random_state, as_float_array
    File "C:\Python34\lib\site-packages\sklearn\utils\__init__.py", line 16, in &lt;module&gt;
      from .class_weight import compute_class_weight, compute_sample_weight
    File "C:\Python34\lib\site-packages\sklearn\utils\class_weight.py", line 7, in &lt;module&gt;
      from ..utils.fixes import in1d
    File "C:\Python34\lib\site-packages\sklearn\utils\fixes.py", line 318, in &lt;module&gt;
      from scipy.sparse.linalg import lsqr as sparse_lsqr
    File "C:\Python34\lib\site-packages\scipy\sparse\linalg\__init__.py", line 109, in &lt;module&gt;
      from .isolve import *
    File "C:\Python34\lib\site-packages\scipy\sparse\linalg\isolve\__init__.py", line 6, in &lt;module&gt;
      from .iterative import *
    File "C:\Python34\lib\site-packages\scipy\sparse\linalg\isolve\iterative.py", line 7, in &lt;module&gt;
      from . import _iterative
  ImportError: DLL load failed: The specified module could not be found.
  </code></pre>
  
  <p>I'm using Python 3.4 on Windows, scikit-learn 0.16.1.</p>