---
title: batchSize
framework: Create ML
role: symbol
role_heading: Instance Property
platforms: [macOS 10.15+]
path: createml/mlactivityclassifier/modelparameters-swift.struct/batchsize
---

# batchSize

The number of sequence chunks the training session uses per iteration.

## Declaration

```swift
var batchSize: Int?
```

## See Also

### Accessing the training parameters

- [validationData](createml/mlactivityclassifier/modelparameters-swift.struct/validationdata.md)
- [maximumIterations](createml/mlactivityclassifier/modelparameters-swift.struct/maximumiterations.md)
- [predictionWindowSize](createml/mlactivityclassifier/modelparameters-swift.struct/predictionwindowsize.md)
- [validation](createml/mlactivityclassifier/modelparameters-swift.struct/validation-swift.property.md)