The trainer argument of Ensembles is of type IComponentFactory<ITrainer<IPredictorProducing<>>>.
However, none of the trainers in ML.NET implement ITrainer<IPredictorProducing<>>, they just implement ITrainer<IPredictor>, so there is no way to specify a different trainer in the arguments
(when running the maml command line).
The trainer argument of Ensembles is of type
IComponentFactory<ITrainer<IPredictorProducing<>>>.However, none of the trainers in ML.NET implement
ITrainer<IPredictorProducing<>>, they just implementITrainer<IPredictor>, so there is no way to specify a different trainer in the arguments(when running the maml command line).