mad replaced with mean_absolute_deviation

[sagarishere]

With reference to pandas documentation, mad has been deprecated. https://pandas.pydata.org/docs/reference/api/pandas.DataFrame.mad.html

In this case, we can get the same result by using mean_absolute_deviation

This will make code future safe and prevent warnings like this one:

[fbdesignpro]

Good catch, however mad was not being used in the recent builds. We will absolutely keep this in mind if we add it back to the summary.