# PreprocessingTemporalEstimator A temporal estimator that composes a preprocessing transformer and a temporal estimator. ``` struct PreprocessingTemporalEstimator where Preprocessor : TemporalTransformer, Estimator : TemporalEstimator, Preprocessor.Output == Estimator.Transformer.Input ``` ## Topics ### Creating an estimator [`init(Preprocessor, Estimator)`](/documentation/CreateMLComponents/PreprocessingTemporalEstimator/init(_:_:)) Creates a composed temporal estimator from a preprocessing transformer and a temporal estimator. ### Getting the properties [`var estimator: Estimator`](/documentation/CreateMLComponents/PreprocessingTemporalEstimator/estimator) The estimator. [`var preprocessor: Preprocessor`](/documentation/CreateMLComponents/PreprocessingTemporalEstimator/preprocessor) The preprocessing transformer. ### Preprocesing and fitting [`func preprocessed(from: InputSequence, eventHandler: EventHandler?) async throws -> [PreprocessedFeatureSequence]`](/documentation/CreateMLComponents/PreprocessingTemporalEstimator/preprocessed(from:eventHandler:)) Preprocesses a sequence of examples. [`func fitted(to: InputSequence, eventHandler: EventHandler?) async throws -> PreprocessingTemporalEstimator.Transformer`](/documentation/CreateMLComponents/PreprocessingTemporalEstimator/fitted(to:eventHandler:)) Fits a transformer to a sequence of examples. [`func fitted(toPreprocessed: [PreprocessedFeatureSequence], eventHandler: EventHandler?) async throws -> PreprocessingTemporalEstimator.Transformer`](/documentation/CreateMLComponents/PreprocessingTemporalEstimator/fitted(toPreprocessed:eventHandler:)) Fits a transformer to a sequence of preprocessed features. [`typealias Input`](/documentation/CreateMLComponents/PreprocessingTemporalEstimator/Input) The input type. [`typealias Intermediate`](/documentation/CreateMLComponents/PreprocessingTemporalEstimator/Intermediate) The intermediate type. [`typealias Output`](/documentation/CreateMLComponents/PreprocessingTemporalEstimator/Output) The output type. [`protocol Transformer`](/documentation/CreateMLComponents/Transformer) A transformer that takes an input and produces an output. ## Relationships ### Conforms To [`TemporalEstimator`](/documentation/CreateMLComponents/TemporalEstimator) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Sendable`](/documentation/Swift/Sendable) --- 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)