Java Cosine Similarity cosineSimilarity(float[] f1, float[] f2)

Description

cosine Similarity

License

Apache License

Declaration

static public double cosineSimilarity(float[] f1, float[] f2) 

Method Source Code

//package com.java2s;
/**//  ww  w. j  a  v  a 2 s .c  o  m
 * Copyright 2015, Emory University
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Main {
    static public double cosineSimilarity(float[] f1, float[] f2) {
        float num = 0, den1 = 0, den2 = 0;

        for (int i = 0; i < f1.length; i++) {
            num += f1[i] * f2[i];
            den1 += sq(f1[i]);
            den2 += sq(f2[i]);
        }

        return num / (Math.sqrt(den1) * Math.sqrt(den2));
    }

    static public long sq(long l) {
        return l * l;
    }

    static public double sq(double d) {
        return d * d;
    }

    static public float sq(float f) {
        return f * f;
    }
}

Related

1. cosine_similarity(double[] vec1, double[] vec2)
2. cosineLawGetDegree(double a, double b, double c)
3. cosineSim(double[] a, double[] b)
4. cosineSimilarity(double[] vector1, double[] vector2)
5. cosineSimilarity(double[] x, double[] y)
6. cosineSimilarity(float[] vectorA, float[] vectorB)
7. cosineSimilarity(String[] tkn0, String[] tkn1)