GBM，XGBoost，LightGBM

GBM如何调参：https://www.analyticsvidhya.com/blog/2016/02/complete-guide-parameter-tuning-gradient-boosting-gbm-python/

XGBoost 应该如何调参：https://www.analyticsvidhya.com/blog/2016/03/complete-guide-parameter-tuning-xgboost-with-codes-python/#

LightGBM和XGBoost：https://www.analyticsvidhya.com/blog/2017/06/which-algorithm-takes-the-crown-light-gbm-vs-xgboost/

def grid_search_params_dict_to_params_list(grid_search_params_dict):
    params_list=[]
    for key in grid_search_params_dict:
        new_params_list=[]
        if len(params_list)==0:
            for value in grid_search_params_dict[key]:
                params_list.append({key:value})
        else:
            for value in grid_search_params_dict[key]:
                for params_dict in params_list:
                    new_params_dict = params_dict.copy()
                    new_params_dict[key] = value
                    new_params_list.append(new_params_dict)
            params_list = new_params_list
    return params_list