---
title: "MLSoundClassifier.ModelParameters.ValidationData.dictionary(_:)"
framework: createml
role: symbol
role_heading: Case
path: "createml/mlsoundclassifier/modelparameters-swift.struct/validationdata/dictionary(_:)"
---

# MLSoundClassifier.ModelParameters.ValidationData.dictionary(_:)

A validation dataset represented by a dictionary.

## Declaration

```swift
case dictionary([String : [URL]])
```

## Discussion

Discussion dictionary: A validation dataset that uses a collection of labeled audio files represented by a dictionary. Each key of the dictionary is a label, and its value is an array of audio-file URLs.

## See Also

### Designating validation data

- [MLSoundClassifier.ModelParameters.ValidationData.split(strategy:)](createml/mlsoundclassifier/modelparameters-swift.struct/validationdata/split(strategy:).md)
- [MLSoundClassifier.ModelParameters.ValidationData.dataSource(_:)](createml/mlsoundclassifier/modelparameters-swift.struct/validationdata/datasource(_:).md)
- [MLSoundClassifier.ModelParameters.ValidationData.none](createml/mlsoundclassifier/modelparameters-swift.struct/validationdata/none.md)