code: def insert_if_not_default(d, key, value, default):
      if value != default:
          d[key] = value
  
imports: import pytest
  import numpy
  import nnabla
  import nnabla.functions
  import nnabla.parametric_functions
  import nnabla.initializer
  from nnabla.testing import assert_allclose
  from nbla_test_utils import list_context
label_desc: Use image node_id 4 for calling a global function with example usage: insert_if_not_default(d, key, value, default) without return types