# TabularTransformer A tabular transformer that transforms a data frame. ``` protocol TabularTransformer : Transformer where Self.Input == DataFrame, Self.Output == DataFrame ``` ## Overview Tabular transformers represent operations on data frames. They modify and operate on values on one or more columns. ## Topics ### Appending [`func appending(_:)`](/documentation/CreateMLComponents/TabularTransformer/appending(_:)) Composes this tabular transformer with another tabular transformer. ### Adapting [`func adaptedAsEstimator() -> TabularTransformerToEstimatorAdaptor`](/documentation/CreateMLComponents/TabularTransformer/adaptedAsEstimator()) Exposes this tabular transformer as a trivial tabular estimator. [`func adaptedAsUpdatableEstimator() -> TabularTransformerToUpdatableEstimatorAdaptor`](/documentation/CreateMLComponents/TabularTransformer/adaptedAsUpdatableEstimator()) Exposes this tabular transformer as an updatable tabular estimator. ### Transforming [`func callAsFunction(DataFrame, eventHandler: EventHandler?) async throws -> DataFrame`](/documentation/CreateMLComponents/TabularTransformer/callAsFunction(_:eventHandler:)) Performs the transformation on a single input. ### Exporting [`func export(to: URL) throws`](/documentation/CreateMLComponents/TabularTransformer/export(to:)) Exports this transformer as a CoreML model. [`func export(to: URL, metadata: ModelMetadata) throws`](/documentation/CreateMLComponents/TabularTransformer/export(to:metadata:)) Exports this tabular transformer as a CoreML model with userInfo. ## Relationships ### Conforming Types [`ColumnConcatenator`](/documentation/CreateMLComponents/ColumnConcatenator) [`ColumnSelectorTransformer`](/documentation/CreateMLComponents/ColumnSelectorTransformer) [`TreeClassifierModel`](/documentation/CreateMLComponents/TreeClassifierModel) [`ComposedTabularTransformer`](/documentation/CreateMLComponents/ComposedTabularTransformer) [`TreeRegressorModel`](/documentation/CreateMLComponents/TreeRegressorModel) ### Inherits From [`Transformer`](/documentation/CreateMLComponents/Transformer) --- 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)