使用PKU人民日报语料库，在把该语料库拆分为小规模时未报错
报错信息：
java.lang.ClassCastException: class com.hankcs.hanlp.corpus.document.sentence.word.CompoundWord cannot be cast to class com.hankcs.hanlp.corpus.document.sentence.word.Word (com.hankcs.hanlp.corpus.document.sentence.word.CompoundWord and com.hankcs.hanlp.corpus.document.sentence.word.Word are in unnamed module of loader ‘app’)
