[timeseries] Show model hyperparmeters in the leaderboard

[shchur]

Description

It should be possible to view the model hyperparameters after HPO is performed. For example, this can be done via the TimeSeriesPredictor.leaderboard method, similar to how TabularPredictor.leaderboard returns such information when extra_info=True.

[shchur]

Here is a workaround that can be used in v1.1 to get this information

def get_hyperparameters(model_name: str) -> dict:
    model = predictor._trainer.load_model(model_name)
    if hasattr(model, "most_recent_model"):
        model = model.most_recent_model
    return model._get_params()

leaderboard = predictor.leaderboard()
leaderboard["hyperparameters"] = [get_hyperparameters(m) for m in leaderboard["model"]]

[dany4142]

Can we please add it as a feature?

[shchur]

@dany4142 we will try to include it in the v1.2 release.