# encodeWithOptimizer(_:to:) Encodes the transformer and optimizer to an encoder. ``` func encodeWithOptimizer(_ transformer: TreeClassifierModel, to encoder: inout any EstimatorEncoder) throws ``` ## Parameters `transformer` A transformer this estimator creates. `encoder` An encoder. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)