code: def create_hpo_backend(*args, **kwargs):
      """Create HPO Search Backend. Only Optuna is supported."""
      from bigdl.nano.deps.automl.hpo_api import create_optuna_backend
  
      return create_optuna_backend(*args, **kwargs)
  
imports: from enum import Enum
label_desc: Use image node_id 1 for calling a global function with example usage: create_hpo_backend() and returns: create_optuna_backend