code: def is_available():
      return is_optuna_available()
  
imports: from .integrations import is_optuna_available, is_ray_tune_available, is_sigopt_available, is_wandb_available, run_hp_search_optuna, run_hp_search_ray, run_hp_search_sigopt, run_hp_search_wandb
  from .trainer_utils import HPSearchBackend, default_hp_space_optuna, default_hp_space_ray, default_hp_space_sigopt, default_hp_space_wandb
  from .utils import logging
label_desc: Use image node_id 1 for calling the OptunaBackend obj's underlying member method code with example usage: obj.is_available() and returns: is_optuna_available