code: def init_retrieval(self):
      self.retriever.index.init_index()
  
file_path: H2O/h2o_flexgen/benchmark/third_party/transformers/examples/research_projects/rag/distributed_ray_retriever.py
imports: import logging
  import random
  import ray
  from transformers import RagConfig, RagRetriever, RagTokenizer
  from transformers.models.rag.retrieval_rag import CustomHFIndex
label_desc: Use image node_id 3 for calling the RayRetriever obj's underlying member method code with example usage: obj.init_retrieval() without return types