code: def init_retrieval(self):
      logger.info("initializing retrieval")
      self.index.init_index()
  
imports: import os
  from typing import List
  import faiss
  import numpy
  import torch
  from datasets import Dataset, load_dataset
  from PIL import Image
  from transformers import CLIPFeatureExtractor, CLIPModel, PretrainedConfig
  from diffusers import logging
label_desc: Use image node_id 5 for calling the Retriever obj's underlying member method code with example usage: obj.init_retrieval() without return types