Jagadish Rangrej

Results 2 issues of Jagadish Rangrej

Hi George, Imputation using this package is bit confusion, tried keeping nan's for to be imputed, but my loss is obviously 1, cannot use 0 because it can be legitimate...

This pull request does couple of things: 1. added WasteWaterData class to the data.py 2. added inverse-normalize function to the Normalizer class