code: def train(self) -> List[Sentence]:
      return self._train
  
file_path: underthesea/underthesea/corpus/categorized_corpus.py
imports: from pathlib import Path
  from typing import List, Union
  from underthesea.corpus import Corpus
  from underthesea.corpus.data import Sentence
label_desc: Use image node_id 2 for calling the CategorizedCorpus obj's underlying member method code with example usage: obj.train() and returns: self