# EstimatorToSupervisedAdaptor An adaptor that exposes an estimator as a supervised estimator. ``` struct EstimatorToSupervisedAdaptor where Estimator : Estimator, Annotation : Equatable ``` ## Topics ### Creating the adaptor [`init(Estimator)`](/documentation/CreateMLComponents/EstimatorToSupervisedAdaptor/init(_:)) Creates an estimator adaptor. ### Getting the properties [`let estimator: Estimator`](/documentation/CreateMLComponents/EstimatorToSupervisedAdaptor/estimator) The wrapped estimator. ### Encoding and decoding [`func encode(EstimatorToSupervisedAdaptor.Transformer, to: inout any EstimatorEncoder) throws`](/documentation/CreateMLComponents/EstimatorToSupervisedAdaptor/encode(_:to:)) Does nothing since this estimator uses a pre-defined transformer. [`func decode(from: inout any EstimatorDecoder) throws -> EstimatorToSupervisedAdaptor.Transformer`](/documentation/CreateMLComponents/EstimatorToSupervisedAdaptor/decode(from:)) Returns the pre-defined transformer. ### Fitting a transformer [`func fitted(to: Input, eventHandler: EventHandler?) async throws -> EstimatorToSupervisedAdaptor.Transformer`](/documentation/CreateMLComponents/EstimatorToSupervisedAdaptor/fitted(to:eventHandler:)) Fits a transformer to a sequence of examples, ignoring the annotations and the validation. [`func fitted(to: Input, validateOn: Validation, eventHandler: EventHandler?) async throws -> EstimatorToSupervisedAdaptor.Transformer`](/documentation/CreateMLComponents/EstimatorToSupervisedAdaptor/fitted(to:validateOn:eventHandler:)) Fits a transformer to a sequence of examples. [`protocol Transformer`](/documentation/CreateMLComponents/Transformer) A transformer that takes an input and produces an output. ## Relationships ### Conforms To [`SupervisedEstimator`](/documentation/CreateMLComponents/SupervisedEstimator) [`Sendable`](/documentation/Swift/Sendable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) --- 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)