code: def distributed_opts_id(params: dict):
      """
      Formatter to display distributed opts in test name.
  
      Params
      ------
      A dictionary containing `batch_size`, `n_cpus` and `actor_cpu_fraction` as keys.
      """
      fmt = "batch_size={} n_cpus={} actor_cpu_fraction={}"
      return fmt.format(*list(params.values()))
  
imports: import inspect
  import os
  import pytest
  import time
  from itertools import product
  from typing import Any, Dict, List, Optional, Tuple, Union
  import numpy
  from alibi.utils.distributed import DistributedExplainer, PoolCollection, ResourceError, invert_permutation, concatenate_minibatches
label_desc: Use image node_id 3 for calling a global function with example usage: distributed_opts_id(params) and returns: fmt