Show HN: TF-IDF search engine in 30 lines of Scala(github.com)

  import math

  class VectorCompare:
    def magnitude(self,concordance):
      total = 0
      for word,count in concordance.iteritems():
        total += count ** 2
      return math.sqrt(total)

    def relation(self,concordance1, concordance2):
      relevance = 0
      topvalue = 0
      for word, count in concordance1.iteritems():
        if concordance2.has_key(word):
          topvalue += count * concordance2[word]
      return topvalue / (self.magnitude(concordance1) * self.magnitude(concordance2))