code: def add_change_log(self, idx, new_token, action, change_seq):
      self.changed_cnt += 1
      self.tokens[idx].add(
          new_token, action=action, change_seq=change_seq
      )
  
file_path: nlpaug/nlpaug/util/doc/doc.py
imports: from nlpaug.util.doc.token import Token
  from nlpaug.util.doc.change_log import ChangeLog
label_desc: Use image node_id 4 for calling the Doc obj's underlying member method code with example usage: obj.add_change_log(idx, new_token, action, change_seq) without return types