tensorflow/core/ops/compat/ops_history_v1/SerializeIterator.pbtxt

op {
  name: "SerializeIterator"
  input_arg {
    name: "resource_handle"
    type: DT_RESOURCE
  }
  output_arg {
    name: "serialized"
    type: DT_VARIANT
  }
  is_stateful: true
}