code: def root(self, subpath: str):
      return f"Hello from {subpath}!"
  
imports: import starlette.requests
  import requests
  from ray import serve
  import ray
  import requests
  from fastapi import FastAPI
  from ray import serve
  import ray
  import requests
  from fastapi import FastAPI
  from ray import serve
  import ray
  import requests
  from fastapi import FastAPI
  from ray import serve
label_desc: Use image node_id 2 for calling the MyFastAPIDeployment obj's underlying member method code with example usage: obj.root(subpath) and returns: str, subpath, str