code: def client() -> "Client":  # type: ignore[misc]
      with clean():
          with Client(dashboard_address=":0") as client:  # type: ignore[no-untyped-call]
              yield client
  
imports: from contextlib import contextmanager
  import time
  from typing import Iterator
  import numpy
  import pytest
  import optuna
  from optuna._imports import try_import
  from optuna.integration.dask import _OptunaSchedulerExtension
  from optuna.integration.dask import DaskStorage
  from optuna.testing.tempfile_pool import NamedTemporaryFilePool
  from optuna.trial import Trial
label_desc: Use image node_id 4 for calling a global function with example usage: client() without return types