---
title: "init(source:alpha:)"
framework: metalperformanceshaders
role: symbol
role_heading: Initializer
path: "metalperformanceshaders/mpsnngrammatrixcalculationnode/init(source:alpha:)"
---

# init(source:alpha:)

## Declaration

```swift
init(source sourceNode: MPSNNImageNode, alpha: Float)
```