---
title: "init(sources:lossDescriptor:)"
framework: metalperformanceshaders
role: symbol
role_heading: Initializer
path: "metalperformanceshaders/mpsnnforwardlossnode/init(sources:lossdescriptor:)"
---

# init(sources:lossDescriptor:)

## Declaration

```swift
init(sources sourceNodes: [MPSNNImageNode], lossDescriptor descriptor: MPSCNNLossDescriptor)
```