class_docstr: Test RAG Turn functionality.
class_docstr_tok: ["Test","RAG","Turn","functionality","."]
code: def test_rag(self):
      _test_bb2_rag(
          KnowledgeAccessMethod.CLASSIFY,
          rag_model_type="sequence",
          n_docs=3,
          batchsize=1,
          query_generator_model_file=SEARCH_QUERY_MODEL,
          rag_retriever_type="search_engine",
          search_server=SEARCH_SERVER,
          insert_gold_docs=True,
          task="wizard_of_internet",
          memory_decoder_model_file=PERSONA_SUMMARY_MODEL,
      )
  
imports: import copy
  import torch.cuda
  import unittest
  from parlai.core.agents import create_agent
  import parlai.utils.testing
label_desc: Use image node_id 1 for calling the TestBB2MemoryDecoder obj's underlying member method code with example usage: obj.test_rag() without return types