RK-A

Kpe_script.py is known to take a long time to run for a bunch of books like Library Reference, Numpy User Guide, etc. One of the reasons is that it runs functions for extracting keyphrases from the dataset using textacy and noun_chunks even when they are not being used currently. We should make changes to ensure that these functions are not called and columns (in CSV) where this data was supposed to be added should be left empty.