code: def get_model(self, target_func, input_converter):
      class Model(chainer.Chain):
          def __init__(self, target_func, input_converter):
              super().__init__()
              self.input_converter = input_converter
              self.fn = target_func
  
          def __call__(self, xs):
              args, kwargs = self.input_converter(xs)
              h = self.fn(*args, **kwargs)
              return F.sigmoid(h)
  
      return Model(target_func, input_converter)
  
imports: import os
  import warnings
  import chainer
  import chainer.functions
  import chainer.links
  from chainer import testing
  import numpy
  import onnx
  import pytest
  from onnx_chainer import export
  from onnx_chainer import export_testcase
  from onnx_chainer import onnx_helper
  from onnx_chainer.replace_func import as_funcnode
  from onnx_chainer.replace_func import fake_as_funcnode
  from onnx_chainer.testing import input_generator
  from onnx_chainer_tests.helper import ONNXModelChecker
  from onnx_chainer_tests.helper import ONNXModelTest
label_desc: Use image node_id 1 for calling the TestReplaceFunc obj's underlying member method code with example usage: obj.get_model(target_func, input_converter) and returns: Model, F