# BoostedTreeClassifier A gradient boosted decision tree classifier. ``` struct BoostedTreeClassifier where Label : Comparable, Label : Decodable, Label : Encodable, Label : Hashable ``` ## Topics ### Creating a classifier [`init(labels: Set, annotationColumnName: String, featureColumnNames: [String], configuration: BoostedTreeConfiguration)`](/documentation/CreateMLComponents/BoostedTreeClassifier/init(labels:annotationColumnName:featureColumnNames:configuration:)) Creates a boosted tree classifier. ### Getting the properties [`var annotationColumnID: ColumnID`](/documentation/CreateMLComponents/BoostedTreeClassifier/annotationColumnID) The annotation column identifier. [`var featureColumnNames: [String]`](/documentation/CreateMLComponents/BoostedTreeClassifier/featureColumnNames) The names of the columns containing feature values. [`var configuration: BoostedTreeConfiguration`](/documentation/CreateMLComponents/BoostedTreeClassifier/configuration) Boosted tree configuration. [`var labels: Set`](/documentation/CreateMLComponents/BoostedTreeClassifier/labels) The set of possible labels. ### Fitting the classifier [`func fitted(to: DataFrame, validateOn: DataFrame?, eventHandler: EventHandler?) async throws -> TreeClassifierModel`](/documentation/CreateMLComponents/BoostedTreeClassifier/fitted(to:validateOn:eventHandler:)) Fits a boosted tree classifier model to a collection of examples. [`typealias Annotation`](/documentation/CreateMLComponents/BoostedTreeClassifier/Annotation) The annotation type. [`typealias Transformer`](/documentation/CreateMLComponents/BoostedTreeClassifier/Transformer) The transformer type created by this estimator. ### Encoding the classifier labels [`func encodeLabels(some Collection>) throws -> (labels: [String?], encoded: [Int])`](/documentation/CreateMLComponents/BoostedTreeClassifier/encodeLabels(_:)) ### Default Implementations [UpdatableSupervisedTabularEstimator Implementations](/documentation/CreateMLComponents/BoostedTreeClassifier/UpdatableSupervisedTabularEstimator-Implementations) ## Relationships ### Conforms To [`SupervisedTabularEstimator`](/documentation/CreateMLComponents/SupervisedTabularEstimator) [`UpdatableSupervisedTabularEstimator`](/documentation/CreateMLComponents/UpdatableSupervisedTabularEstimator) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Copyable`](/documentation/Swift/Copyable) [`Escapable`](/documentation/Swift/Escapable) [`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)