code: def toc():
      global tictoc
      name, t0 = tictoc
      dt = time.time() - t0
      print(f"{name}: {dt:.3f} s")
      return dt
  
file_path: faiss/benchs/bench_big_batch_ivf.py
imports: import argparse
  import time
  import faiss
  import numpy
  from faiss.contrib.datasets import SyntheticDataset
  from faiss.contrib.big_batch_search import big_batch_search
label_desc: Use image node_id 3 for calling a global function with example usage: toc() and returns: dt