---
title: momentum
framework: ML Compute
role: symbol
role_heading: Instance Property
platforms: [iOS 14.0+, iPadOS 14.0+, Mac Catalyst 14.0+, macOS 11.0+, tvOS 14.0+]
path: mlcompute/mlcbatchnormalizationlayer/momentum
---

# momentum

The value you use for the running mean and variance computation.

## Declaration

```swift
var momentum: Float { get }
```

## Discussion

Discussion The default is 0.99.

## See Also

### Inspecting Batch Normalization Layers

- [featureChannelCount](mlcompute/mlcbatchnormalizationlayer/featurechannelcount.md)
- [mean](mlcompute/mlcbatchnormalizationlayer/mean.md)
- [variance](mlcompute/mlcbatchnormalizationlayer/variance.md)
- [beta](mlcompute/mlcbatchnormalizationlayer/beta.md)
- [gamma](mlcompute/mlcbatchnormalizationlayer/gamma.md)
- [varianceEpsilon](mlcompute/mlcbatchnormalizationlayer/varianceepsilon.md)
- [betaParameter](mlcompute/mlcbatchnormalizationlayer/betaparameter.md)
- [gammaParameter](mlcompute/mlcbatchnormalizationlayer/gammaparameter.md)