code: def merge(self, dataset):
      self.sentences = [
          self.merge_sentence(s, dataset) for s in self.sentences
      ]
  
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 9 for calling the UDDataset obj's underlying member method code with example usage: obj.merge(dataset) without return types