code: def check_type(self, _, dtype):
      # TODO(loreno): handle dictionaries with non-sortable keys and change
      # this test to assertEqual once that works
      self.assertTrue(
          self.x.dtype == dtype
      )  # pylint: disable=g-generic-assert
      return self.x
  
imports: from absl.testing import parameterized
  from sonnet.src import base
  from sonnet.src import mixed_precision
  from sonnet.src import test_utils
  import tensorflow
  import tree
label_desc: Use image node_id 2 for calling the DummyVar obj's underlying member method code with example usage: obj.check_type(_, dtype) and returns: self