code: def generate_params(self):
      return ()
  
imports: import unittest
  import numpy
  import pytest
  import six.moves.cPickle
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import links
  from chainer import memory_layouts
  from chainer import testing
  from chainer.testing import attr
  from chainer.utils import conv
label_desc: Use image node_id 2 for calling the TestConvolution2DParameterShapePlaceholder obj's underlying member method code with example usage: obj.generate_params() and returns: 