code: def case_regressor(
      tmp_dir: str,
      make_automl_regressor: Callable[..., AutoMLRegressor],
  ) -> AutoMLRegressor:
      """Case basic unfitted AutoMLClassifier"""
      dir = Path(tmp_dir) / "backend"
      model = make_automl_regressor(temporary_directory=str(dir))
      return model
  
imports: from __future__ import annotations
  from typing import Callable, Tuple
  from pathlib import Path
  import numpy
  import sklearn.model_selection
  import autosklearn.metrics
  from autosklearn.automl import AutoMLClassifier, AutoMLRegressor
  from autosklearn.automl_common.common.utils.backend import Backend
  from autosklearn.evaluation.abstract_evaluator import MyDummyClassifier, MyDummyRegressor
  from pytest_cases import case, parametrize
  from test.fixtures.backend import copy_backend
  from test.fixtures.caching import Cache
label_desc: Use image node_id 3 for calling a global function with example usage: case_regressor(tmp_dir, make_automl_regressor) and returns: model