code: def ref_div2(x, y):
      return x / y
  
file_path: nnabla/python/test/function/test_transform_binary.py
imports: import pytest
  import numpy
  import nnabla
  import nnabla.functions
  from nbla_test_utils import function_tester, list_ctx_and_func_name
label_desc: Use image node_id 4 for calling a global function with example usage: ref_div2(x, y) and returns: unknown