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If I set the parameter objective to regression_l1 and set the metric to mean absolute error in LightGBM.cv, should I also use the regularization parameter reg_alpha or can I still use reg_lambda?

The reason I would like to use reg_lambda is because of this suggestion https://datascience.stackexchange.com/a/57450, but I don't know if I would need to change the score metric then also, which I do not want to do.

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