code: def test_clip_l2_grad_norm_cpu():
      _test_clip_l2_grad_norm_(-1)
  
file_path: pfrl/tests/utils_tests/test_clip_l2_grad_norm.py
imports: import timeit
  from logging import getLogger
  import numpy
  import pytest
  import torch
  from torch import nn
  from pfrl.utils import clip_l2_grad_norm_
label_desc: Use image node_id 3 for calling a global function with example usage: test_clip_l2_grad_norm_cpu() without return types