Which values can i use for the optimize Parameters Operator in a deep Learning Prediction Model

Hello,

I am currently implementing a performance Test with the gradient boosted tree und the deep learning algorithm for a prediction model.
For the GBT i used the number of trees, maximal depth and the learning rate for the optimize parameters operator. But I have no idea with witch parameters I can try to optimize my deep learning model.

Thanks for your help an a happy new year 
Alex