code: def testIdentity(self):
      for dtype in _TEST_DTYPES:
          inp = self._makeData((2, 2, 2), dtype)
          self._compare(inp, 0, 1)
          self._compare(inp, 1, 1)
          self._compare(inp, 2, 1)
  
imports: import numpy
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors_impl
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gradients_impl
  from tensorflow.python.ops import math_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 18 for calling the SplitOpTest obj's underlying member method code with example usage: obj.testIdentity() without return types