code: def test_valid_padding(self):
      valid_paddings = ("VALID", "SAME", "same", "valid", 10, 1, (7, 1))
      for padding in valid_paddings:
          layers.Convolution((2, 3, 1), padding=padding)
  
imports: import random
  from itertools import product
  from collections import namedtuple
  import numpy
  import tensorflow
  from neupy import layers
  from neupy.utils import asfloat, shape_to_tuple
  from neupy.layers.convolutions import conv_output_shape, deconv_output_shape
  from neupy.exceptions import LayerConnectionError
  from base import BaseTestCase
label_desc: Use image node_id 6 for calling the ConvLayersTestCase obj's underlying member method code with example usage: obj.test_valid_padding() without return types