---
title: validationData
framework: createml
role: symbol
role_heading: Instance Property
path: createml/mldecisiontreeclassifier/modelparameters-swift.struct/validationdata-swift.property
---

# validationData

The data used for the validation set to inform the model training process.

## Declaration

```swift
var validationData: MLDataTable? { get set }
```

## See Also

### Accessing parameters

- [maxDepth](createml/mldecisiontreeclassifier/modelparameters-swift.struct/maxdepth.md)
- [minLossReduction](createml/mldecisiontreeclassifier/modelparameters-swift.struct/minlossreduction.md)
- [minChildWeight](createml/mldecisiontreeclassifier/modelparameters-swift.struct/minchildweight.md)
- [randomSeed](createml/mldecisiontreeclassifier/modelparameters-swift.struct/randomseed.md)
- [validation](createml/mldecisiontreeclassifier/modelparameters-swift.struct/validation.md)