---
title: MPSGraphRNNActivation.hardSigmoid
framework: metalperformanceshadersgraph
role: symbol
role_heading: Case
path: metalperformanceshadersgraph/mpsgraphrnnactivation/hardsigmoid
---

# MPSGraphRNNActivation.hardSigmoid

Defines a Hard sigmoid activation.

## Declaration

```swift
case hardSigmoid
```