code: def test_empty_batch_dim(self):
      y = self.link(chainer.Variable(self.x))
      assert y.shape == self.shape
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import gradient_check
  from chainer import links
  from chainer import testing
  from chainer.testing import attr
  from chainer.testing import condition
  from chainer.utils import type_check
label_desc: Use image node_id 2 for calling the TestEmptyBatchInitialize obj's underlying member method code with example usage: obj.test_empty_batch_dim() without return types