code: def generate_inputs(self):
      x = numpy.random.uniform(-1, 1, (2, 3, 4, 3)).astype(
          numpy.float32
      )
      return (x,)
  
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 4 for calling the TestConvolution2DParameterShapePlaceholder obj's underlying member method code with example usage: obj.generate_inputs() and returns: x