# TemporalTransformer A transformer that takes an asynchronous input sequence of temporal features and produces an asynchronous output sequence. ``` protocol TemporalTransformer ``` ## Overview A temporal transformer, unlike a regular transformer, can accumulate multiple inputs before producing an output. For example, an audio transformer can accumulate audio buffers until the desired length is reached before producing an output. ## Topics ### Applying and adapting [`func applied(to: S, eventHandler: EventHandler?) async throws -> Self.OutputSequence`](/documentation/CreateMLComponents/TemporalTransformer/applied(to:eventHandler:)) Performs the transformation on an input sequence. [`func adaptedAsEstimator() -> TemporalTransformerToEstimatorAdaptor`](/documentation/CreateMLComponents/TemporalTransformer/adaptedAsEstimator()) Exposes this temporal transformer as a trivial temporal estimator. [`func adaptedAsUpdatableEstimator() -> TemporalTransformerToUpdatableEstimatorAdaptor`](/documentation/CreateMLComponents/TemporalTransformer/adaptedAsUpdatableEstimator()) Exposes this temporal transformer as a trivial temporal estimator. [`associatedtype Input`](/documentation/CreateMLComponents/TemporalTransformer/Input) The input type. [`associatedtype Output`](/documentation/CreateMLComponents/TemporalTransformer/Output) The output type. [`associatedtype OutputSequence : TemporalSequence`](/documentation/CreateMLComponents/TemporalTransformer/OutputSequence) The output async sequence type. ### Appending [`func appending(_:)`](/documentation/CreateMLComponents/TemporalTransformer/appending(_:)) Composes this temporal transformer with another temporal transformer. ### Transforming and predicting [`func callAsFunction(S, eventHandler: EventHandler?) async throws -> Self.OutputSequence`](/documentation/CreateMLComponents/TemporalTransformer/callAsFunction(_:eventHandler:)) Performs the transformation on an input sequence. [`func callAsFunction(to: S, eventHandler: EventHandler?) async throws -> [Self.OutputSequence]`](/documentation/CreateMLComponents/TemporalTransformer/callAsFunction(to:eventHandler:)) Performs the transformation on a sequence of inputs. [`func prediction(from: S) async throws -> Self.OutputSequence`](/documentation/CreateMLComponents/TemporalTransformer/prediction(from:)) Performs a prediction on a single input. ### Exporting [`func export(to: URL) throws`](/documentation/CreateMLComponents/TemporalTransformer/export(to:)) Exports this temporal transformer as a CoreML model. [`func export(to: URL, metadata: ModelMetadata) throws`](/documentation/CreateMLComponents/TemporalTransformer/export(to:metadata:)) Exports this temporal transformer as a CoreML model with user-supplied metadata. ## Relationships ### Conforming Types [`TransformerToTemporalAdaptor`](/documentation/CreateMLComponents/TransformerToTemporalAdaptor) [`SlidingWindowTransformer`](/documentation/CreateMLComponents/SlidingWindowTransformer) [`Model`](/documentation/CreateMLComponents/TimeSeriesClassifier/Model) [`ComposedTemporalTransformer`](/documentation/CreateMLComponents/ComposedTemporalTransformer) [`AudioFeaturePrint`](/documentation/CreateMLComponents/AudioFeaturePrint) [`Model`](/documentation/CreateMLComponents/LinearTimeSeriesForecaster/Model) [`TemporalAdaptor`](/documentation/CreateMLComponents/TemporalAdaptor) [`Downsampler`](/documentation/CreateMLComponents/Downsampler) [`HumanBodyActionCounter`](/documentation/CreateMLComponents/HumanBodyActionCounter) --- 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)