No module named 'corner'

[nnj1]

Upon trying to import msmexplorer, I get the following error.

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-161-36c499e6e3bd> in <module>()
----> 1 import msmexplorer as msme
      2 import numpy as np
      3 txx = np.concatenate(tica_trajs)
      4 _ = msme.plot_histogram(txx)

~/anaconda3/lib/python3.6/site-packages/msmexplorer/__init__.py in <module>()
----> 1 from .plots import *
      2 
      3 from .version import version as _version
      4 __version__ = _version

~/anaconda3/lib/python3.6/site-packages/msmexplorer/plots/__init__.py in <module>()
      2 from .msm import *
      3 from .tpt import *
----> 4 from .projection import *
      5 from .cluster import *
      6 from .misc import *

~/anaconda3/lib/python3.6/site-packages/msmexplorer/plots/projection.py in <module>()
      3 from matplotlib import pyplot as pp
      4 
----> 5 from corner import corner
      6 from seaborn.distributions import (_scipy_univariate_kde, _scipy_bivariate_kde)
      7 

ModuleNotFoundError: No module named 'corner'