pm.compareplot gives error "KeyError: 'pwaic'" while creating axis labels

Describe the bug Using recent update by conda I have got an unexpected error from compareplot.

To Reproduce the code

df_comp_WAIC = pm.compare(dict([(model_gamma, trace_gamma),
                                (model_weibull, trace_weibull),
                                (model_lognormal, trace_lognormal)]),ic='WAIC')
pm.compareplot(df_comp_WAIC);

shows the plot but gives an error while trying to display the axis labels

---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
~/anaconda3/lib/python3.7/site-packages/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance)
   2656             try:
-> 2657                 return self._engine.get_loc(key)
   2658             except KeyError:

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()

KeyError: 'pwaic'

During handling of the above exception, another exception occurred:

KeyError                                  Traceback (most recent call last)
<ipython-input-123-347d24b0eaad> in <module>
      2                                 (model_weibull, trace_weibull),
      3                                 (model_lognormal, trace_lognormal)]),ic='WAIC')
----> 4 pm.compareplot(df_comp_WAIC);
      5 # df_comp_WAIC

~/anaconda3/lib/python3.7/site-packages/pymc3/plots/__init__.py in compareplot(*args, **kwargs)
     81     else:
     82         args[0] = comp_df
---> 83     return az.plot_compare(*args, **kwargs)
     84 
     85 from .posteriorplot import plot_posterior_predictive_glm

~/anaconda3/lib/python3.7/site-packages/arviz/plots/compareplot.py in plot_compare(comp_df, insample_dev, plot_standard_error, plot_ic_diff, figsize, textsize, plot_kwargs, ax)
    143     if insample_dev:
    144         ax.plot(
--> 145             comp_df[information_criterion] - (2 * comp_df["p" + information_criterion]),
    146             yticks_pos[::2],
    147             color=plot_kwargs.get("color_insample_dev", "k"),

~/anaconda3/lib/python3.7/site-packages/pandas/core/frame.py in __getitem__(self, key)
   2925             if self.columns.nlevels > 1:
   2926                 return self._getitem_multilevel(key)
-> 2927             indexer = self.columns.get_loc(key)
   2928             if is_integer(indexer):
   2929                 indexer = [indexer]

~/anaconda3/lib/python3.7/site-packages/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance)
   2657                 return self._engine.get_loc(key)
   2658             except KeyError:
-> 2659                 return self._engine.get_loc(self._maybe_cast_indexer(key))
   2660         indexer = self.get_indexer([key], method=method, tolerance=tolerance)
   2661         if indexer.ndim > 1 or indexer.size > 1:

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()

KeyError: 'pwaic'

Expected behavior I haven’t had such problem before

Additional context

Running with PyMC3 version v.3.7.rc1
Running with arviz version v.0.3.2
Running with pandas version v.0.24.2

installed by conda (python 3.7.3, macOS)

[aakhmetz]

@OriolAbril Yes, I checked with ArviZ 0.4.1 today, and it worked smoothly. Thank you again

[aakhmetz]

@OriolAbril Thanks for checking and for your time! I will be waiting for the next update then