lightning.classification.FistaClassifier -- lightning dev documentation

The method can also take an arbitrary Penalty object, i.e., an instance that implements methods projection regularization method (see file penalty.py) Whether to use a direct multiclass formulation (True) or one-vs-rest (False). Maximum number of steps to use during the line search. Constant used in the line search sufficient decrease condition. For example, eta 2. will decrease the step size by a factor of 2 at each iteration of the line-search routine.