---
title: "evaluation(on:)"
framework: createml
role: symbol
role_heading: Instance Method
path: "createml/mlactionclassifier/evaluation(on:)"
---

# evaluation(on:)

Generates metrics describing the action classifier’s performance on labeled videos represented by a data source.

## Declaration

```swift
func evaluation(on annotatedVideos: MLActionClassifier.DataSource) throws -> MLClassifierMetrics
```

## Parameters

- `annotatedVideos`: A collection of labeled videos represented by a data source.

## See Also

### Evaluating an action classifier

- [trainingMetrics](createml/mlactionclassifier/trainingmetrics.md)
- [validationMetrics](createml/mlactionclassifier/validationmetrics.md)