code: def config_and_inputs(self):
      question_encoder_tester = DPRModelTester(self)
      dpr_config_and_inputs = (
          question_encoder_tester.prepare_config_and_inputs()
      )
      generator_tester = BartModelTester(self)
      bart_config_and_inputs = (
          generator_tester.prepare_config_and_inputs_for_common()
      )
  
      (
          question_encoder_config,
          input_ids,
          _,
          input_mask,
          _,
          _,
          _,
      ) = dpr_config_and_inputs
      (generator_config, bart_inputs_dict) = bart_config_and_inputs
      decoder_input_ids, decoder_attention_mask = (
          bart_inputs_dict["input_ids"],
          bart_inputs_dict["attention_mask"],
      )
  
      config = RagConfig.from_question_encoder_generator_configs(
          question_encoder_config,
          generator_config,
          n_docs=self.n_docs,
          retrieval_vector_size=self.retrieval_vector_size,
          max_combined_length=self.max_combined_length,
      )
  
      return {
          "config": config,
          "input_ids": input_ids,
          "attention_mask": input_mask,
          "decoder_input_ids": decoder_input_ids,
          "decoder_attention_mask": decoder_attention_mask,
      }
  
imports: import gc
  import json
  import os
  import shutil
  import tempfile
  import unittest
  from unittest.mock import patch
  import numpy
  from transformers import BartTokenizer, T5Tokenizer
  from transformers.models.bert.tokenization_bert import VOCAB_FILES_NAMES
  from transformers.models.dpr.tokenization_dpr import DPRContextEncoderTokenizer, DPRQuestionEncoderTokenizer
  from transformers.models.roberta.tokenization_roberta import VOCAB_FILES_NAMES
  from transformers.testing_utils import get_tests_dir, require_sentencepiece, require_tokenizers, require_torch, require_torch_non_multi_gpu, slow, torch_device
  from transformers.utils import cached_property, is_datasets_available, is_faiss_available, is_torch_available
  from ..bart.test_modeling_bart import BartModelTester
  from ..dpr.test_modeling_dpr import DPRModelTester
  from ..t5.test_modeling_t5 import T5ModelTester
label_desc: Use image node_id 1 for calling the RagDPRBartTest obj's underlying member method code with example usage: obj.config_and_inputs() and returns: dict