title: ModuleNotFoundError: No module named 'scipy.sparse.base'
body: <p>I'm trying to run <code>from sklearn import preprocessing</code>, but it raise an error:</p>
  <pre><code>Traceback (most recent call last):
  
    File &quot;&lt;ipython-input-6-d27a4e3c0526&gt;&quot;, line 1, in &lt;module&gt;
      from sklearn import preprocessing
  
    File &quot;/Users/x/anaconda3/lib/python3.6/site-packages/sklearn/__init__.py&quot;, line 82, in &lt;module&gt;
      from .base import clone
  
    File &quot;/Users/x/anaconda3/lib/python3.6/site-packages/sklearn/base.py&quot;, line 17, in &lt;module&gt;
      from .utils import _IS_32BIT
  
    File &quot;/Users/x/anaconda3/lib/python3.6/site-packages/sklearn/utils/__init__.py&quot;, line 20, in &lt;module&gt;
      from scipy.sparse import issparse
  
    File &quot;/Users/x/.local/lib/python3.6/site-packages/scipy/sparse/__init__.py&quot;, line 227, in &lt;module&gt;
      from .base import *
  
  ModuleNotFoundError: No module named 'scipy.sparse.base'
  </code></pre>
  <p>How could I deal with it?</p>
  <p>The version of <code>scipy</code> is <code>1.5.4</code>.</p>