class_docstr: mock seq2seq data class seq2seq task.
class_docstr_tok: ["mock","seq2seq","data","class","seq2seq","task","."]
code: def __init__(self, project_dir):
      super().__init__(project_dir)
      self.train_file = "train.txt"
      self.dev_file = "dev.txt"
      self.test_file = "test.txt"
  
      files = [self.train_file, self.dev_file, self.test_file]
      suffix = [".tgt", ".src"]
      self.data_files = [file + suf for suf in suffix for file in files]
  
      self.config_files = ["transformer_s2s_mock.yml"]
      self.download_files = []
  
      # samples with label
      self.samples = [
          " a shooting at a bar popular with expatriates in mali on saturday killed "
          "five people \t killed five people",
          "a pennsylvania community is pulling together to search for an eighth-grade "
          "student who has been missing since wednesday\tsearch for missing student",
      ]
  
file_path: delta/delta/data/datasets/mock_text_seq2seq_data.py
imports: import os
  import traceback
  from absl import logging
  from delta.data.datasets.base_dataset import BaseDataSet
  from delta.data.datasets.utils import mock_data
  from delta.utils.register import registers
label_desc: Use image node_id 1 to create a new MockTextSeq2SeqData object from inherited base classes: BaseDataSet with example: obj = MockTextSeq2SeqData(project_dir)