---
title: "init(device:decay:epsilon:optimizerDescriptor:)"
framework: metalperformanceshaders
role: symbol
role_heading: Initializer
path: "metalperformanceshaders/mpsnnoptimizerrmsprop/init(device:decay:epsilon:optimizerdescriptor:)"
---

# init(device:decay:epsilon:optimizerDescriptor:)

## Declaration

```swift
init(device: any MTLDevice, decay: Double, epsilon: Float, optimizerDescriptor: MPSNNOptimizerDescriptor)
```