code: def testName(self):
      dataset = dataset_ops.Dataset.from_tensors(
          np.int64(42)
      ).group_by_window(
          key_func=lambda x: x,
          reduce_func=lambda key, window: window.batch(4),
          window_size=4,
          name="group_by_window",
      )
      self.assertDatasetProduces(dataset, [[42]])
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.core.lib.core import error_codes_pb2
  from tensorflow.python.data.kernel_tests import checkpoint_test_base
  from tensorflow.python.data.kernel_tests import test_base
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.framework import combinations
  from tensorflow.python.framework import constant_op
  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.ops import array_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import string_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 14 for calling the GroupByWindowTest obj's underlying member method code with example usage: obj.testName() without return types