---
title: alpha
framework: metalperformanceshaders
role: symbol
role_heading: Instance Property
path: metalperformanceshaders/mpscnncrosschannelnormalization/alpha
---

# alpha

The “alpha” variable of the kernel function.

## Declaration

```swift
var alpha: Float { get set }
```

## Discussion

Discussion The default value is 1.0. Values must be non-negative.

## See Also

### Instance Properties

- [beta](metalperformanceshaders/mpscnncrosschannelnormalization/beta.md)
- [delta](metalperformanceshaders/mpscnncrosschannelnormalization/delta.md)
- [kernelSize](metalperformanceshaders/mpscnncrosschannelnormalization/kernelsize.md)