code: def testOptimizationWarmStart(self, warm_start):
      dataset = dataset_ops.Dataset.range(10)
      counter = variables.Variable(0)
  
      def update_counter(x):
          counter.assign_add(1)
          return x
  
      options = options_lib.Options()
      options.experimental_optimization.apply_default_optimizations = (
          False
      )
      if warm_start:
          options.experimental_warm_start = True
      else:
          options.experimental_warm_start = False
      dataset = dataset.with_options(options)
      dataset = dataset.map(update_counter).prefetch(10)
      unused_iter = iter(dataset)
  
      if warm_start:
          for sleep_time_secs in [0.1, 0.2, 0.5, 2, 5, 10]:
              if counter.numpy() == 0:
                  time.sleep(sleep_time_secs)
              else:
                  break
          self.assertGreater(counter.numpy(), 0)
      else:
          self.assertEqual(counter.numpy(), 0)
  
imports: import functools
  import time
  from absl.testing import parameterized
  import numpy
  from tensorflow.python.data.experimental.ops import batching
  from tensorflow.python.data.experimental.ops import grouping
  from tensorflow.python.data.experimental.ops import scan_ops
  from tensorflow.python.data.experimental.ops import testing
  from tensorflow.python.data.kernel_tests import test_base
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.data.ops import options
  from tensorflow.python.framework import combinations
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import random_ops
  from tensorflow.python.ops import variable_scope
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
label_desc: Use image node_id 9 for calling the OptimizationTest obj's underlying member method code with example usage: obj.testOptimizationWarmStart(warm_start) and returns: x