# BNNS.ActivationFunction.clamp(bounds:) An activation function that returns its input clamped to the specified range. ``` case clamp(bounds: ClosedRange) ``` ## Discussion This constant defines an activation function that returns values using the following operation: ```c min(max(x, alpha), beta) ``` Use `alpha` and `beta` to specify the clamping range: ```swift var activation = BNNSActivation(function: .clamp, alpha: -5, beta: 5) ``` The following illustrates the output that the activation function generates from inputs in the range `-10...10`:  --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)