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# evaluation(on:)

Generates metrics by evaluating the sound classifier’s performance on a dataset represented by a data source.

```
func evaluation(on testingData: MLSoundClassifier.DataSource) -> MLClassifierMetrics
```

## Parameters

`testingData`

A collection of labeled audio files represented by an [`MLSoundClassifier.DataSource`](/documentation/CreateML/MLSoundClassifier/DataSource).

## Return Value

An [`MLClassifierMetrics`](/documentation/CreateML/MLClassifierMetrics) instance that contains the evaluation results.

---

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