code: def test_implicit_temporary_input(self):
      class Model(chainer.Chain):
          def forward(self, x):
              return x + chainer.Variable(np.array(3, dtype=np.float32))
  
      x = np.array(5, dtype=np.float32)
      self.expect(Model(), x, name="implicit_temp_input")
  
imports: import unittest
  import chainer
  import chainer.functions
  import chainer.links
  from chainer import testing
  import numpy
  import pytest
  from onnx_chainer import export
  from onnx_chainer.export import RetainInputHook
  from onnx_chainer.testing import input_generator
  from onnx_chainer_tests.helper import ONNXModelTest
label_desc: Use image node_id 3 for calling the TestImplicitInput obj's underlying member method code with example usage: obj.test_implicit_temporary_input() and returns: unknown