code: def test_x_not_tensor(self, x):
      self.assertIs(x, batch_apply.split_leading_dim(x, None, 1))
  
imports: from absl.testing import parameterized
  import numpy
  from sonnet.src import base
  from sonnet.src import batch_apply
  from sonnet.src import test_utils
  import tensorflow
label_desc: Use image node_id 1 for calling the SplitLeadingDimTest obj's underlying member method code with example usage: obj.test_x_not_tensor(x) without return types