code: def get_ud_str(self):
      return "\n".join(["\t".join(row) for row in self.rows])
  
imports: from os.path import dirname, join, exists
  from torch.utils.data import Dataset
  from underthesea import pos_tag
  from underthesea import dependency_parse
  from underthesea.utils.col_analyzer import UDAnalyzer
label_desc: Use image node_id 3 for calling the UDSentence obj's underlying member method code with example usage: obj.get_ud_str() and returns: str