searchengine - relation

// ...
    def relation(self, concordance1, concordance2):
        if type(concordance1) != dict:
            raise ValueError('Supplied Argument 1 should be of type dict')
        if type(concordance2) != dict:
            raise ValueError('Supplied Argument 2 should be of type dict')
        relevance = 0
        # calculate topvalue = max{count1*count2}
        topvalue = 0
        for word, count in concordance1.items():
            if word in concordance2:
                topvalue += count * concordance2[word]
        # return topvalue / (|v1||v2|) which is a measurement of how relevant the two
        # vectors are to each other
        if (self.magnitude(concordance1) * self.magnitude(concordance2)) != 0:
            return topvalue / (self.magnitude(concordance1) * self.magnitude(concordance2))
        else:
            return 0
// ...