text: # Identities
  USER_ID = 'user_id'
  BUSINESS_ID = 'business_id'
  REVIEW_ID = 'review_id'
  
  # columns in the yelp dataset review file
  TEXT = 'text'
  STARS = 'stars'
  DATE = 'date'
  USEFUL = "useful"
  FUNNY = "funny"
  COOL = "cool"
  
  # added columns to the review file
  LANGUAGE = 'language'
  REVIEW_LENGTH = 'review_length'
  