code: def testDVariableNoLayout(self):
      with self.assertRaisesRegex(
          errors_impl.InvalidArgumentError,
          "Neither layout nor DTensor initial value are provided.",
      ):
          DVariable(1.0)
  
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 3 for calling the DTensorVariableTest obj's underlying member method code with example usage: obj.testDVariableNoLayout() without return types