code: def objective(trial: Trial) -> float:
      x = trial.suggest_float("x", -10, 10)
      return (x - 2) ** 2
  
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 2 for calling a global function with example usage: objective(trial) and returns: unknown