code: def _dummy_objective(x, a, b):
      return a * (x**0.5) + b
  
file_path: autogluon/core/tests/unittests/hpo/test_ray_hpo.py
imports: import tempfile
  import pytest
  from ray import tune
  from autogluon.core.hpo.ray_hpo import AutommRayTuneAdapter, RayTuneAdapter, TabularRayTuneAdapter, run
  from autogluon.core.hpo.ray_tune_constants import SCHEDULER_PRESETS, SEARCHER_PRESETS
label_desc: Use image node_id 1 for calling a global function with example usage: _dummy_objective(x, a, b) and returns: unknown