Silence warning for GaussianNormalizer.fit

[npatki]

RDT version: 1.0.0 (dev branch)

Problem Description

Right now, the fit function in the GaussianNormalizer transformer always prints out the following RuntimeWarning statements from scipy:

/usr/local/lib/python3.7/dist-packages/scipy/stats/_continuous_distns.py:5320: RuntimeWarning: divide by zero encountered in true_divide
  return c**2 / (c**2 - n**2)
/usr/local/lib/python3.7/dist-packages/scipy/stats/_distn_infrastructure.py:2606: RuntimeWarning: invalid value encountered in double_scalars
  Lhat = muhat - Shat*mu

These are very frequently triggered for a variety of datasets and are not immediately useful to the end user.

Expected behavior

Let's silence only these two RuntimeWarnings in this call. That is, the user should be able to see all other warnings just now these two.

We can use the warnings module.

import warnings

# silence the warnings
warnings.filterwarnings('ignore')

<code>

# stop silencing the warnings?
warnings.filterwarnings('default')