code: def build_model(self):
      return lambda x: x
  
imports: import base64
  import multiprocessing
  import os
  from unittest.mock import ANY, MagicMock
  import pytest
  from lightning.app.components.serve import serve
  from lightning.app.testing.helpers import _RunIf
  from lightning.app.utilities.imports import _is_numpy_available, _is_torch_available
  from lightning.app.utilities.network import _configure_session, find_free_network_port
  from tests_app import _PROJECT_ROOT
label_desc: Use image node_id 1 for calling the ImageServer obj's underlying member method code with example usage: obj.build_model() and returns: function