class_docstr: conll2003 data class for seqlabel 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"
      self.data_files = [self.train_file, self.test_file, self.dev_file]
      self.config_files = [
          "conll_2003_seq_label_bert.yml",
          "conll_2003_seq_label_elmo.yml",
          "conll_2003_seq_label_lstm_crf.yml",
      ]
      self.download_files = [
          self.train_file,
          self.test_file,
          self.dev_file,
      ]
  
file_path: delta/delta/data/datasets/conll_2003.py
imports: import os
  import traceback
  import wget
  from absl import logging
  from delta.data.datasets.base_dataset import BaseDataSet
  from delta.utils.register import registers
label_desc: Use image node_id 1 to create a new Conll2003 object from inherited base classes: BaseDataSet with example: obj = Conll2003(project_dir)