code: def foo(a, b, c=None, d=None):
      for i in range(3):
          wait_one()
      for j in range(4):
          wait_two()
  
file_path: nnabla/python/test/utils/test_function_profile.py
imports: import time
  import pytest
  import nnabla.utils.function_profile
label_desc: Use image node_id 4 for calling a global function with example usage: foo(a, b, c, d) without return types