title: Can't import plot_acf from statsmodels.graphics.tsaplots (Import Error)
body: <p>I'm getting an error when trying to import plot_acf from statsmodels</p>
  
  <pre><code>---------------------------------------------------------------------------
  ImportError                               Traceback (most recent call last)
  &lt;ipython-input-290-9212ac9a550b&gt; in &lt;module&gt;
  ----&gt; 1 from statsmodels.graphics.tsaplots import plot_acf
  
  //anaconda3/lib/python3.7/site-packages/statsmodels/graphics/tsaplots.py in &lt;module&gt;
        5 
        6 from statsmodels.graphics import utils
  ----&gt; 7 from statsmodels.tsa.stattools import acf, pacf
        8 
        9 
  
  //anaconda3/lib/python3.7/site-packages/statsmodels/tsa/stattools.py in &lt;module&gt;
       12 import pandas as pd
       13 
  ---&gt; 14 from statsmodels.regression.linear_model import OLS, yule_walker
       15 from statsmodels.tools.sm_exceptions import (InterpolationWarning,
       16                                              MissingDataError,
  
  //anaconda3/lib/python3.7/site-packages/statsmodels/regression/__init__.py in &lt;module&gt;
  ----&gt; 1 from .linear_model import yule_walker
        2 
        3 from statsmodels.tools._testing import PytestTester
        4 
        5 __all__ = ['yule_walker', 'test']
  
  //anaconda3/lib/python3.7/site-packages/statsmodels/regression/linear_model.py in &lt;module&gt;
       44 from statsmodels.tools.decorators import (cache_readonly,
       45                                           cache_writable)
  ---&gt; 46 import statsmodels.base.model as base
       47 import statsmodels.base.wrapper as wrap
       48 from statsmodels.emplike.elregress import _ELRegOpts
  
  //anaconda3/lib/python3.7/site-packages/statsmodels/base/model.py in &lt;module&gt;
       10 from statsmodels.stats.contrast import (ContrastResults, WaldTestResults,
       11                                         t_test_pairwise)
  ---&gt; 12 from statsmodels.tools.decorators import (cache_readonly,
       13                                           cached_value, cached_data)
       14 import statsmodels.base.wrapper as wrap
  
  ImportError: cannot import name 'cached_value' from 'statsmodels.tools.decorators' (//anaconda3/lib/python3.7/site-packages/statsmodels/tools/decorators.py)
  </code></pre>
  
  <p>-</p>
  
  <p>I have tried uninstalling and reinstalling numpy, scipy, pandas, patsy and scipy through the terminal.</p>
  
  <p>I've checked modules with help(modules) and at first got a Shimwarning </p>
  
  <pre><code>(//anaconda/lib/python3.4/site-packages/IPython/kernel/__init__.py:13: ShimWarning: The `IPython.kernel` package has been deprecated. You should import from ipykernel or jupyter_client instead.
    "You should import from ipykernel or jupyter_client instead.", ShimWarning)
  </code></pre>
  
  <p>However after reinstallation I no longer get this warning However, I still get the same error when trying to import plot_acf from statmodels.graphics.tsaplots</p>
  
  <p>Can anyone help me?</p>