public TfidfExtractor(JiebaSegmenter segmenter = null)
{
Segmenter = segmenter.IsNull() ? new JiebaSegmenter() : segmenter;
PosSegmenter = new PosSegmenter(Segmenter);
SetStopWords(ConfigManager.StopWordsFile);
if (StopWords.IsEmpty())
{
StopWords.UnionWith(DefaultStopWords);
}
Loader = new IdfLoader(DefaultIdfFile);
IdfFreq = Loader.IdfFreq;
MedianIdf = Loader.MedianIdf;
}