# stratifiedSplit(proportions:generator:) Generates an array of labeled audio dictionaries by splitting the data source into strata using the random-number generator. ``` func stratifiedSplit(proportions: [Double], generator: inout RNG) throws -> [[String : [URL]]] where RNG : RandomNumberGenerator ``` ## Parameters `proportions` An array of proportions, each in the range `[0.0, 1.0]`. `generator` A random-number generator. ## Return Value An array of dictionaries of labeled audio files. Each dictionary key is a label string and its value is an array of audio-file URLs. --- 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)