code: def server(fn):
      fn._is_server_fn = True
      return fn
  
imports: from __future__ import annotations
  import abc
  import hashlib
  import json
  import sys
  import warnings
  from abc import ABC, abstractmethod
  from enum import Enum
  from pathlib import Path
  from typing import TYPE_CHECKING, Any, Callable
  from gradio_client.documentation import set_documentation_group
  from PIL import Image
  from gradio import utils
  from gradio.blocks import Block, BlockContext
  from gradio.component_meta import ComponentMeta
  from gradio.data_classes import GradioDataModel
  from gradio.events import EventListener
  from gradio.layouts import Form
  from gradio.processing_utils import move_files_to_cache
label_desc: Use image node_id 1 for calling a global function with example usage: server(fn) and returns: fn