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  "title" : "MLActivityClassifier.ModelParameters.Validation"
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# MLActivityClassifier.ModelParameters.Validation

The source of a validation dataset for an activity classifier.

```
enum Validation
```

## Topics

### Specifying validation data

[`case split(strategy: MLSplitStrategy)`](/documentation/CreateML/MLActivityClassifier/ModelParameters-swift.struct/Validation-swift.enum/split(strategy:))

A validation dataset derived by randomly selecting a portion of the training data.

[`case dataSource(MLActivityClassifier.DataSource)`](/documentation/CreateML/MLActivityClassifier/ModelParameters-swift.struct/Validation-swift.enum/dataSource(_:))

A validation dataset represented by a data source.

[`case none`](/documentation/CreateML/MLActivityClassifier/ModelParameters-swift.struct/Validation-swift.enum/none)

An empty validation dataset that skips the model validation phase after training.


---

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