code: def test_basic(self):
      # Tests that basic convolutions work for odd and even
      # dimensions of image and filter shapes, as well as rectangular
      # images and filters.
  
      self.validate(
          (3, 2, 8, 8), (4, 2, 5, 5), "valid", verify_grad=False
      )
      self.validate((3, 2, 7, 5), (5, 2, 2, 3), "valid")
      self.validate(
          (3, 2, 7, 5), (5, 2, 3, 2), "valid", verify_grad=False
      )
      self.validate(
          (3, 2, 8, 8), (4, 2, 5, 5), "full", verify_grad=False
      )
      self.validate((3, 2, 7, 5), (5, 2, 2, 3), "full")
  
imports: from __future__ import absolute_import, print_function, division
  import time
  from nose.plugins.skip import SkipTest
  import numpy
  import theano
  import theano.tensor
  from theano.tests import unittest_tools
  from theano.tensor.nnet import conv
  from theano.tensor.basic import _allclose, NotScalarConstantError
  from theano.tests.unittest_tools import attr
label_desc: Use image node_id 4 for calling the TestConv2D obj's underlying member method code with example usage: obj.test_basic() without return types