How to set fixed value to other lightgbm parameters

[keremtatlici]

I want to set fixed value to other lightgbm parameters that is not on the search tree. For example in lightgbm doc there is a parameter named reg_sqrt. I want to make that parameter True while tuning the other parameters.But how to ?

[qingyun-wu]

Hi @keremtatlici, you can create a customized LGBM learner and set the parameters you want to fix in the constructor of this customized learner accordingly (similar to the way we set the 'verbose' parameter here). Then you can add this customized learner to your automl instance to use it (you can find an example of how to create and add a customized learner in this notebook In [22] automl.add_learner(learner_name='my_lgbm', learner_class=MyLGBM)). Let me know if you need further help. Thank you!

[sonichi]

@keremtatlici we added a new feature to do this easily. Please check https://microsoft.github.io/FLAML/docs/Use-Cases/Task-Oriented-AutoML#a-shortcut-to-override-the-search-space. Please try version 1.0.4.