code: def testAssignUpdate(self):
      for dtype in [
          dtypes.float32,
          dtypes.int64,
          dtypes.uint32,
          dtypes.uint8,
          dtypes.bfloat16,
      ]:
          var = state_ops.variable_op([1, 2], dtype)
          added = state_ops.assign_add(var, [[2, 3]])
          self.assertEqual([1, 2], added.get_shape())
          subbed = state_ops.assign_sub(var, [[12, 13]])
          self.assertEqual([1, 2], subbed.get_shape())
  
imports: import numpy
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor_shape
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import array_ops_stack
  from tensorflow.python.ops import gen_state_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import state_ops
  from tensorflow.python.ops import variable_v1
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
label_desc: Use image node_id 14 for calling the VariableOpTest obj's underlying member method code with example usage: obj.testAssignUpdate() without return types