oliverwang

实现了关键词提取的textrank算法，请yanyi check一下。另外，idf的方法和textrank哪个更优？

2

``` /* * TextRank.hpp * * Created on: 2015年7月7日 * Author: oliverlwang */ #ifndef TEXTRANK_H_ #define TEXTRANK_H_ #include "UndirectWeightedGraph.hpp" namespace CppJieba { class TextRank { public: TextRank() : _span(2) {};...

xlearn required setting num_feature at first，but we do not know the num_features in the future due to online learning scene