class_docstr: DataSource which loads data from CoNLL-U file.
class_docstr_tok: ["DataSource","which","loads","data","from","CoNLL-U","file","."]
code: def raw_train_data_generator(self):
      return iter(self._train_file)
  
file_path: pytext/pytext/data/sources/conllu.py
imports: import threading
  from typing import Dict, List, Optional, Type
  from pytext.data.sources.data_source import RootDataSource, SafeFileWrapper
label_desc: Use image node_id 4 for calling the CoNLLUPOSDataSource obj's underlying member method code with example usage: obj.raw_train_data_generator() and returns: iter