code: def __init__(self, feats, k, index_path="", verbose=True):
      pass
  
file_path: dgl/examples/pytorch/hilander/utils/knn.py
imports: import math
  import multiprocessing
  import os
  import numpy
  from tqdm import tqdm
  from utils import Timer
  from .faiss_search import faiss_search_knn
label_desc: Use image node_id 1 to create a new knn object  with example: obj = knn(feats, k, index_path, verbose)