class_docstr: A CNN model which adds spp layer so that we can input multi-size tensor
code: def test_spp(self):
      aspp_module = ASPP()
      self.assertEqual(256, aspp_module(self.input).shape[1])
  
imports: import unittest
  import torch
  from towhee.models.layers.aspp import ASPP
label_desc: Use image node_id 2 for calling the TestOperator obj's underlying member method code with example usage: obj.test_spp() without return types