# MLSequence A machine learning collection type that stores a series of strings or integers. ``` class MLSequence ``` ## Overview A sequence stores a series of integers or strings of any length as the underlying type of an `MLFeatureValue`. Some classifier models — typically natural language models, such as an — produce an [`MLSequence`](/documentation/CoreML/MLSequence) feature value from their output features. ## Topics ### Creating a sequence [`init(strings:)`](/documentation/CoreML/MLSequence/init(strings:)) Creates a sequence of strings from a string array. [`init(int64s:)`](/documentation/CoreML/MLSequence/init(int64s:)) Creates a sequence of integers from an array of numbers. [`init(empty:)`](/documentation/CoreML/MLSequence/init(empty:)) Creates an empty sequence of strings or integers. ### Identifying the sequence’s element type [`type`](/documentation/CoreML/MLSequence/type) The underlying type of the sequence’s elements. ### Retrieving the Sequence’s Values [`stringValues`](/documentation/CoreML/MLSequence/stringValues) An array of strings in the sequence. [`int64Values`](/documentation/CoreML/MLSequence/int64Values) An array of 64-bit integers in the sequence. --- 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)