code: def host() -> t.Generator[str, None, None]:
      with host_bento(bento="tensorflow_mnist_demo:latest") as host:
          yield host
  
imports: import pathlib
  import subprocess
  import typing
  import pytest
  from bentoml.testing.server import host_bento
label_desc: Use image node_id 2 for calling a global function with example usage: host() without return types