code: def testBufferAliasingOnDF(self):
      # TODO(b/239471086): re-enable once b/239471086 is fixed
      self.skipTest("Disabled due to b/239471086")
      self.skipForDeviceType(
          ["GPU", "CPU"], "Test only applies to DF TPU"
      )
  
      @polymorphic_function.function
      def add_var(v):
          new_v = array_ops_stack.stack([v, v])
          v.assign(math_ops.reduce_sum(new_v, axis=0))
          # Note that this only works with DF. When updated to PF, we need to
          # adjust tensor size accordingly.
          #
          # Without aliasing, the returned tensor is 3.5G * 4 = 14G, plus the
          # reserved 500MB and 3.5G arguments, this exceeds the 16G memory.
          # With aliasing, the 3.5G arguments will be aliased so it lowers the
          # memory pressure to 18-3.5 = 14.5G, which barely fits the memory.
          return v, new_v
  
      # Around 3.5G tensor.
      v = DVariable(
          initial_value=api.relayout(
              array_ops.ones((7, 512, 1024, 256), dtype=dtypes.float32),
              Layout.replicated(self.mesh, rank=4),
          )
      )
  
      add_var(v)
  
      self.assertEqual(
          api.fetch_layout(v), Layout.replicated(self.mesh, rank=4)
      )
  
imports: import numpy
  from tensorflow.dtensor.python import api
  from tensorflow.dtensor.python import d_variable
  from tensorflow.dtensor.python import layout
  from tensorflow.dtensor.python.tests import test_util
  from tensorflow.python.eager.polymorphic_function import polymorphic_function
  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.ops import array_ops
  from tensorflow.python.ops import array_ops_stack
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
label_desc: Use image node_id 11 for calling the DTensorVariableTest obj's underlying member method code with example usage: obj.testBufferAliasingOnDF() and returns: v,  new_v