code: def build_model(self):
      return "model"
  
file_path: pytorch-lightning/tests/tests_app/components/serve/test_streamlit.py
imports: import os
  import sys
  from unittest import mock
  import lightning.app
  import pytest
  from lightning.app.components.serve.streamlit import ServeStreamlit, _build_model, _PatchedWork
  from lightning_utilities.core.imports import RequirementCache
label_desc: Use image node_id 5 for calling the ServeStreamlitTest obj's underlying member method code with example usage: obj.build_model() and returns: str