# reuseExtractedFeatures(from:) Uses the features another session has already extracted from its dataset. ``` final func reuseExtractedFeatures(from session: MLTrainingSession) throws ``` ## Parameters `session` Another training session that’s already completed its feature extraction phase. ## Discussion You can only use this method for a new training session that doesn’t already have its own checkpoints. > Note: This method throws an error if the training session has one or > more checkpoints. --- 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)