How to load trials and analyze results on trainer.hyperparameter_search

Intermediate
1

I run 100 trials using:

trainer = Trainer (...)
 trainer.hyperparameter_search(backend='ray',
                                                hp_space=ray_hp_space,
                                                search_alg=hyperopt_search,
                                                n_trials=100,...)

I want to load the results of all trials as a pandas dataframe. How to do that ?