code: def check_forward(self, xs):
      # Non-finite values does not work for integer values.
      if (
          not numpy.isfinite(self.pad)
          and numpy.dtype(self.dtype).kind != "f"
      ):
          return
  
      with disable_debug_mode_if(self.can_include_nan):
          y = functions.pad_sequence(
              xs, length=self.length, padding=self.pad
          )
  
      self.assertEqual(y.shape, self.y_shape)
      for i, (length, x) in enumerate(
          six.moves.zip(self.lengths, self.xs)
      ):
          testing.assert_allclose(y.data[i, 0:length], x)
          testing.assert_allclose(
              y.data[i, length:], self.dtype(self.pad)
          )
  
imports: import contextlib
  import unittest
  import numpy
  import six
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 2 for calling the TestPadSequence obj's underlying member method code with example usage: obj.check_forward(xs) without return types