code: def testAssignUpdateNoVarShape(self):
      var = state_ops.variable_op(
          [1, 2], dtypes.float32, set_shape=False
      )
      added = state_ops.assign_add(var, [[2.0, 3.0]])
      self.assertEqual([1, 2], added.get_shape())
      subbed = state_ops.assign_sub(var, [[12.0, 13.0]])
      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 15 for calling the VariableOpTest obj's underlying member method code with example usage: obj.testAssignUpdateNoVarShape() without return types