Java 求两个向量余弦相似度计算代码

公式：

源码：

	public Double getCosineSimilarity( List<Double> x, List<Double> y ){double numerator = 0D;for( int i = 0; i < x.size(); i++ ){numerator += x.get( i ) * y.get( i );}double leftDenominator = 0D;for( Double num : x ){leftDenominator += num * num;}double rightDenominator = 0D;for( Double num : y ){rightDenominator += num * num;}return numerator / ( Math.sqrt( leftDenominator ) * Math.sqrt( rightDenominator ) );}