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

# validationData

A set of images that the training process uses for validation.

## Declaration

```swift
var validationData: [String : [URL]]? { get set }
```

## See Also

### Accessing the training parameters

- [algorithm](createml/mlimageclassifier/modelparameters-swift.struct/algorithm.md)
- [featureExtractor](createml/mlimageclassifier/modelparameters-swift.struct/featureextractor.md)
- [validation](createml/mlimageclassifier/modelparameters-swift.struct/validation.md)
- [maxIterations](createml/mlimageclassifier/modelparameters-swift.struct/maxiterations.md)
- [augmentationOptions](createml/mlimageclassifier/modelparameters-swift.struct/augmentationoptions.md)