---
title: beta2
framework: ML Compute
role: symbol
role_heading: Instance Property
platforms: [iOS 15.0+, iPadOS 15.0+, Mac Catalyst 15.0+, macOS 12.0+, tvOS 15.0+]
path: mlcompute/mlcadamwoptimizer/beta2
---

# beta2

The coefficent for computing running averages of square of gradient.

## Declaration

```swift
var beta2: Float { get }
```

## See Also

### Inspecting an AdamW Optimizer

- [beta1](mlcompute/mlcadamwoptimizer/beta1.md)
- [epsilon](mlcompute/mlcadamwoptimizer/epsilon.md)
- [timeStep](mlcompute/mlcadamwoptimizer/timestep.md)
- [usesAMSGrad](mlcompute/mlcadamwoptimizer/usesamsgrad.md)