amirouche

Goals:
  Easy to learn and use by beginning programmers
  Easy to relearn and use by "perpetual intermediate" programmers
  Suitable for use as a front-end language (not in a browser)
  Not infuriating to advanced programmers
  Case insensitive (except strings)
  Everything should be as simple as possible but no simpler
  
High-level design choices:
  Mostly intended for easy UI programming

amirouche

# BM25F Model

def bm25(idf, tf, fl, avgfl, B, K1):
    # idf - inverse document frequency
    # tf - term frequency in the current document
    # fl - field length in the current document
    # avgfl - average field length across documents in collection
    # B, K1 - free paramters

    return idf * ((tf * (K1 + 1)) / (tf + K1 * (1 - B + B * (fl / avgfl))))