This extension would suggest reviewers for a current review request. It keeps

track of all previous reviews and suggests a username of someone who has 

reviewed something similar in the past. The extension uses an ML model called 

kNN algorithm by calculating the distance between past reviews and the current

review request.

Ran the ML model with past reviews and compared suggested reviewers with the 

actual person that reviewed the change set using SuggestReviewersAccuracy.py.
Settled on the combination of weights, and which variables to include in the 

distance calculation based on the combination that gave the highest accuracy score.

Please take a look at allresults.csv.