How can I export a model (Predictor) trained on Amazon Forecast?

With Amazon Forecast, hosting trained models is done automatically in the service itself. You cannot export the trained models out of the service. You can view the model hyperparameters used by expanding the "training parameters" section on the Predictor page in UI. Or you can issue API command describe_predictor(). If you don't see a setting in the "training parameters" section, then it has default value, documented under each algorithm > hyperparameters section https://docs.aws.amazon.com/forecast/latest/dg/aws-forecast-choosing-recipes.html