Java SparseVector.twoNorm示例

示例#1

文件： NormalizedDotProductMetric.java 项目： GhassenJ/twitter_nlp

 public double distance(SparseVector a, SparseVector b) {
   //		double ret = a.dotProduct (b) /
   //								 Math.sqrt (a.dotProduct (a) * b.dotProduct (b));
   // gmann : twoNorm() more efficient than a.dotProduct(a)
   double ret = a.dotProduct(b) / (a.twoNorm() * b.twoNorm());
   return 1.0 - ret;
 }