code: def __init__(self, data, tokenizer, config):
      self.data = data
      self.tokenizer = tokenizer
      self.config = config
      self.max_len_input = self.config.max_seq_length
      self.max_len_target = self.config.max_target_length
  
label_desc: Use image node_id 1 to create a new Seq2SeqDataset object  with example: obj = Seq2SeqDataset(data, tokenizer, config)