# init(locale:identifier:version:builder:) Constructs a data container using a builder ``` convenience init(locale: Locale, identifier: String, version: String, @SFCustomLanguageModelData.DataInsertableBuilder builder: () -> any DataInsertable) ``` ## Parameters `locale` the region and language of the training data (must match with the locale used to construct the `SFSpeechRecognizer` later) `identifier` used to uniquely identify the resulting language model on the device where it will be processed `version` used to distinguish different versions of the language model on the device where it will be processed `builder` a DataInsertableBuilder object that yields DataInsertable objects ## Discussion The `SFCustomLanguageModelData` class accumulates language model training and custom vocabulary data, both associated with a specified locale. This initializer creates an object that is initially populated using the provided builder. --- 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)