public Double cosineSimilarity()

in src/main/java/org/apache/commons/text/similarity/CosineSimilarity.java [55:79]

• 23 lines of code
• 7 McCabe index (conditional complexity)

    public Double cosineSimilarity(final Map<CharSequence, Integer> leftVector,
                                   final Map<CharSequence, Integer> rightVector) {
        if (leftVector == null || rightVector == null) {
            throw new IllegalArgumentException("Vectors must not be null");
        }

        final Set<CharSequence> intersection = getIntersection(leftVector, rightVector);

        final double dotProduct = dot(leftVector, rightVector, intersection);
        double d1 = 0.0d;
        for (final Integer value : leftVector.values()) {
            d1 += Math.pow(value, 2);
        }
        double d2 = 0.0d;
        for (final Integer value : rightVector.values()) {
            d2 += Math.pow(value, 2);
        }
        final double cosineSimilarity;
        if (d1 <= 0.0 || d2 <= 0.0) {
            cosineSimilarity = 0.0;
        } else {
            cosineSimilarity = dotProduct / (Math.sqrt(d1) * Math.sqrt(d2));
        }
        return cosineSimilarity;
    }