code: def benchmark_step():
      global args, data
      for _ in range(args.internal_num_iters):
          bf.neighbor_allreduce(data)
  
file_path: bluefog/scripts/single_ops_test.py
imports: import argparse
  import timeit
  import numpy
  import torch
  import bluefog.torch
  from bluefog.common import topology_util
label_desc: Use image node_id 1 for calling a global function with example usage: benchmark_step() without return types