code: def generate_inputs(self):
      xs = tuple(
          numpy.random.uniform(-1, 1, self.shape).astype(self.dtype)
          for _ in six.moves.range(self.xs_length)
      )
      return xs
  
imports: import unittest
  import numpy
  import pytest
  import six
  from chainer import functions
  from chainer import testing
  from chainer.testing import attr
  from chainer.utils import type_check
label_desc: Use image node_id 2 for calling the TestVstack obj's underlying member method code with example usage: obj.generate_inputs() and returns: xs