/*** *** *** *** *** *** *** *** *** *** *** *** *** *** * High Resolution Windows Timer * --- --- --- --- ----- * code by : bobby anguelov - banguelov@cs.up.ac.za * downloaded from : http://www.cs.up.ac.za/cs/banguelov/blog/HRTimer.h

TFIDF特征计算，用于博文分词后进行特征词的提取用。-TFIDF feature calculation for Blog word feature extraction