---
title: "reuseExtractedFeatures(from:)"
framework: createml
role: symbol
role_heading: Instance Method
path: "createml/mltrainingsession/reuseextractedfeatures(from:)"
---

# reuseExtractedFeatures(from:)

Uses the features another session has already extracted from its dataset.

## Declaration

```swift
final func reuseExtractedFeatures(from session: MLTrainingSession<Task>) throws
```

## Parameters

- `session`: Another training session that’s already completed its feature extraction phase.

## Discussion

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.