# MLTrainingSession The current state of a model’s asynchronous training session. ``` final class MLTrainingSession ``` ## Topics ### Checking a training session’s progress [`phase`](/documentation/CreateML/MLTrainingSession/phase) The training session’s current state. [`MLPhase`](/documentation/CreateML/MLPhase) The possible states of a training session. [`iteration`](/documentation/CreateML/MLTrainingSession/iteration) The iteration number of a training session’s phase. [`checkpoints`](/documentation/CreateML/MLTrainingSession/checkpoints) An array of checkpoints the training session has created so far. ### Removing checkpoints [`removeCheckpoints(_:)`](/documentation/CreateML/MLTrainingSession/removeCheckpoints(_:)) Removes the checkpoints that satisfy your closure from the training session. ### Reusing features from a previous session [`reuseExtractedFeatures(from:)`](/documentation/CreateML/MLTrainingSession/reuseExtractedFeatures(from:)) Uses the features another session has already extracted from its dataset. ### Inspecting a session [`date`](/documentation/CreateML/MLTrainingSession/date) The time when you created this training session. [`parameters`](/documentation/CreateML/MLTrainingSession/parameters) The parameters you used to create the training session. --- 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)