message: Set serialized.shape=[] in parse_single_example.
diff: @@ -470,6 +470,7 @@ def parse_single_example_v2_unoptimized(
  [serialized, example_names]):
  serialized = ops.convert_to_tensor(serialized, name="serialized")
  serialized = _assert_scalar(serialized, "serialized")
  + serialized.set_shape([])
  return parse_example_v2(serialized, features, example_names, name)
  if example_names is None:
  return parse_single_example_v2(serialized, features, name)
  