deprecation warning

[elfelround]

DeprecationWarning: scipy.exp is deprecated and will be removed in SciPy 2.0.0, use numpy.exp instead

[rasbt]

Thanks! Also here, I fixed this via @118 as

from distutils.version import LooseVersion as Version
from scipy import __version__ as scipy_version

if scipy_version >= Version('1.4.1'):
    from numpy import exp
else:
    from scipy import exp