:: DeveloperApi ::
Trait for models and transformers which may be saved as files.
This should be inherited by the class which implements model instances.
Current version of model save/load format.
Save this model to the given path.
The model may be loaded using Loader.load.
Spark context used to save model data.
Path specifying the directory in which to save this model.
If the directory already exists, this method throws an exception.