---
title: validation
framework: createml
role: symbol
role_heading: Instance Property
path: createml/mllinearregressor/modelparameters-swift.struct/validation
---

# validation

Validation data.

## Declaration

```swift
var validation: MLLinearRegressor.ModelParameters.ValidationData { get set }
```

## Discussion

Discussion The default is .split(strategy: .automatic), which automatically generates the validation dataset from 0% to 10% of the training dataset.

## See Also

### Accessing parameters

- [validationData](createml/mllinearregressor/modelparameters-swift.struct/validationdata-swift.property.md)
- [maxIterations](createml/mllinearregressor/modelparameters-swift.struct/maxiterations.md)
- [l1Penalty](createml/mllinearregressor/modelparameters-swift.struct/l1penalty.md)
- [l2Penalty](createml/mllinearregressor/modelparameters-swift.struct/l2penalty.md)
- [stepSize](createml/mllinearregressor/modelparameters-swift.struct/stepsize.md)
- [convergenceThreshold](createml/mllinearregressor/modelparameters-swift.struct/convergencethreshold.md)
- [featureRescaling](createml/mllinearregressor/modelparameters-swift.struct/featurerescaling.md)