未登陆词的集中处理方式
character-based
word-piece
Word: Jet makers feud over seat width with big orders at stake
wordpieces解码方式1: _J et _makers _fe ud _over _seat _width _with _big _orders _at _stake
wordpieces解码方式2: J #et makers fe #ud over seat width with big orders at stake
hybrid-word/charcter
word: 中国人
hybrid: <B>中
<M>国
<E>人
word-piece适合处理英语等字符数有限拼音文字语言,hybrid适合处理汉语等字符数众多的形义文字/图画文字