code: def set_ef(self, ef):
      self.index.set_ef(ef)
  
file_path: hnswlib/examples/python/pyw_hnswlib.py
imports: import hnswlib
  import numpy
  import threading
  import pickle
label_desc: Use image node_id 4 for calling the Index obj's underlying member method code with example usage: obj.set_ef(ef) without return types