code: def faiss_search_approx_knn(
      query,
      target,
      k,
      nprobe=128,
      bs=int(1e6),
      index_factory_str=None,
      verbose=False,
  ):
      index = faiss_index_wrapper(
          target,
          nprobe=nprobe,
          index_factory_str=index_factory_str,
          verbose=verbose,
      )
      dists, nbrs = batch_search(
          index, query, k=k, bs=bs, verbose=verbose
      )
  
      del index
      gc.collect()
      return dists, nbrs
  
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 2 for calling a global function with example usage: faiss_search_approx_knn(query, target, k, nprobe, bs, index_factory_str, verbose) and returns: dists,  nbrs