code: def __del__(self):
      self.index.reset()
      del self.index
      for res in self._res_list:
          del res
  
file_path: dgl/examples/pytorch/hilander/utils/faiss_gpu.py
imports: import gc
  import os
  import faiss
  import numpy
  from tqdm import tqdm
label_desc: Use image node_id 3 for calling the faiss_index_wrapper obj's underlying member method code with example usage: obj.__del__() without return types