code: def f():
      return {"c": {}, "d": {"a": {}}}
  
file_path: fastapi/tests/test_duplicate_models_openapi.py
imports: from fastapi import FastAPI
  from fastapi.testclient import TestClient
  from pydantic import BaseModel
label_desc: Use image node_id 1 for calling a global function with example usage: f() and returns: dict