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# MLSoundClassifier.ModelParameters.FeatureExtractorType.vggish(revision:)

Represents the VGGish feature extractor, which is compatible with older OS versions.

```
case vggish(revision: Int = 1)
```

## Parameters

`revision`

A version of the VGGish feature extractor.

## Discussion

The case uses the newest version if you don’t provide an associated value for `revision`.

---

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