code: def sink(self, o):
      pass
  
file_path: ray/python/ray/serve/_private/benchmarks/common.py
imports: import inspect
  import time
  from typing import Callable, Coroutine, Tuple
  import numpy
  import pandas
  from tqdm import tqdm
label_desc: Use image node_id 1 for calling the Blackhole obj's underlying member method code with example usage: obj.sink(o) without return types