title: ImportError: cannot import name 'MultiOutputMixin' from 'sklearn.base'
body: <p>I just want to do a linear regression with scikit-learn. When I try to import the linear model package the error message from the title appears.</p>
  
  <p>I tried to follow the solution from a similar problem (<a href="https://stackoverflow.com/questions/55447538/importerror-cannot-import-name-unstablearchmixin-from-sklearn-base">link</a>). The suggestion is basically to just get rid of the part of the code where it requests for the "MultipleOutputMixin" thingy. </p>
  
  <p>When I do this, of course the MultiOuputMixin is no longer the problem, but it derives in an error at the line marked as 22 in the error message shown below.</p>
  
  <p>Any ideas on what can I do to avoid the problem?</p>
  
  <p>Thanks in advance for your help! :)</p>
  
  <p>Python version = 3.70
  scikit-learn verion = 0.21.2</p>
  
  <p>This is what I'm doing:</p>
  
  <pre><code>from sklearn import linear_model
  </code></pre>
  
  <p>This is the error that I get:</p>
  
  <pre><code>ImportError                               Traceback (most recent call last)
  &lt;ipython-input-46-1c4d4ebecc3f&gt; in &lt;module&gt;()
        1 # Select a linear
  ----&gt; 2 from sklearn import linear_model
  
  C:\Users\Usuario\Anaconda3\lib\site-packages\sklearn\linear_model\__init__.py in &lt;module&gt;()
       13 
       14 from .bayes import BayesianRidge, ARDRegression
  ---&gt; 15 from .least_angle import (Lars, LassoLars, lars_path, lars_path_gram, LarsCV,
       16                           LassoLarsCV, LassoLarsIC)
       17 from .coordinate_descent import (Lasso, ElasticNet, LassoCV, ElasticNetCV,
  
  C:\Users\Usuario\Anaconda3\lib\site-packages\sklearn\linear_model\least_angle.py in &lt;module&gt;()
       18 
       19 from .base import LinearModel
  ---&gt; 20 from ..base import RegressorMixin, MultiOutputMixin
       21 from ..utils import arrayfuncs, as_float_array, check_X_y
       22 from ..model_selection import check_cv
  
  ImportError: cannot import name 'MultiOutputMixin' from 'sklearn.base' (C:\Users\Usuario\Anaconda3\lib\site-packages\sklearn\base.py)
  </code></pre>