相似性计算

public double CosSim(HashMap<String, Double> hashA,HashMap<String, Double> hashB,double sa,double sb){ double sum=0; HashMap<String, Double> tmp=null; if (hashA.size()>hashB.size()) { tmp=hashA; hashA=hashB; hashB=tmp; } java.util.Iterator<String> iterator = hashA.keySet().iterator();while (iterator.hasNext()){String word = iterator.next();if(hashB.containsKey(word)){sum=sum+hashA.get(word)*hashB.get(word);}}sum=sum/(sa*sb); return sum;}