---
title: beta2
framework: accelerate
role: symbol
role_heading: Instance Property
path: accelerate/bnnsoptimizeradamfields/beta2
---

# beta2

A value that specifies the second moment constant in the range 0 to 1.

## Declaration

```swift
var beta2: Float
```

## See Also

### Instance Properties

- [learning_rate](accelerate/bnnsoptimizeradamfields/learning_rate.md)
- [beta1](accelerate/bnnsoptimizeradamfields/beta1.md)
- [time_step](accelerate/bnnsoptimizeradamfields/time_step.md)
- [epsilon](accelerate/bnnsoptimizeradamfields/epsilon.md)
- [gradient_scale](accelerate/bnnsoptimizeradamfields/gradient_scale.md)
- [regularization_scale](accelerate/bnnsoptimizeradamfields/regularization_scale.md)
- [clip_gradients](accelerate/bnnsoptimizeradamfields/clip_gradients.md)
- [clip_gradients_min](accelerate/bnnsoptimizeradamfields/clip_gradients_min.md)
- [clip_gradients_max](accelerate/bnnsoptimizeradamfields/clip_gradients_max.md)
- [regularization_func](accelerate/bnnsoptimizeradamfields/regularization_func.md)