// which is passed to the functions referenced in the TFE_CustomDevice struct
// `device` (execute, delete_device, etc.). It can for example contain the
// names of wrapped devices.
//
// There are currently no graph semantics implemented for registered custom
// devices, so executing tf.functions which contain operations placed on the
// custom devices will fail.
//
// `device_name` must not name an existing physical or custom device. It must

        *   `StringLookup` added `output_mode`, `sparse`, and
            `pad_to_max_tokens` arguments with same semantics as
            `TextVectorization`.
        *   `IntegerLookup` added `output_mode`, `sparse`, and
            `pad_to_max_tokens` arguments with same semantics as
            `TextVectorization`. Renamed `max_values`, `oov_value` and

// but merges the input shape with the existing shape.  For example,
// setting a shape of [-1, 2] with an existing shape [2, -1] would set
// a final shape of [2, 2] based on shape merging semantics.
//
// Returns an error into `status` if:
//   * `output` is not in `graph`.
//   * An invalid shape is being set (e.g., the shape being set
//     is incompatible with the existing shape).