<!--
{
  "availability" : [
    "iOS: -",
    "iPadOS: -",
    "macCatalyst: -",
    "macOS: -",
    "tvOS: -",
    "visionOS: -",
    "watchOS: -"
  ],
  "documentType" : "symbol",
  "framework" : "Accelerate",
  "identifier" : "/documentation/Accelerate/BNNSActivation",
  "metadataVersion" : "0.1.0",
  "role" : "Structure",
  "symbol" : {
    "kind" : "Structure",
    "modules" : [
      "Accelerate"
    ],
    "preciseIdentifier" : "c:@SA@BNNSActivation"
  },
  "title" : "BNNSActivation"
}
-->

# BNNSActivation

A set of parameters that describe common activation functions.

```
struct BNNSActivation
```

## Topics

### Initializers

[`init()`](/documentation/Accelerate/BNNSActivation/init())

Returns a new common activation function parameters structure.

[`init(function:alpha:beta:)`](/documentation/Accelerate/BNNSActivation/init(function:alpha:beta:))

Returns a new common activation function parameters structure that uses the specified function, alpha, and beta.

[`init(function:alpha:beta:iscale:ioffset:ishift:iscale_per_channel:ioffset_per_channel:ishift_per_channel:)`](/documentation/Accelerate/BNNSActivation/init(function:alpha:beta:iscale:ioffset:ishift:iscale_per_channel:ioffset_per_channel:ishift_per_channel:))

Returns a new common activation function parameters structure that uses the specified function, alpha, beta, integer scale, offset, and shift.

### Instance Properties

[`function`](/documentation/Accelerate/BNNSActivation/function)

The activation function that the layer applies to its output.

[`alpha`](/documentation/Accelerate/BNNSActivation/alpha)

The parameter for the alpha of the activation function.

[`beta`](/documentation/Accelerate/BNNSActivation/beta)

The parameter for the beta of the activation function.

[`iscale`](/documentation/Accelerate/BNNSActivation/iscale)

Scale for integer functions.

[`ioffset`](/documentation/Accelerate/BNNSActivation/ioffset)

Offset for integer functions.

[`ishift`](/documentation/Accelerate/BNNSActivation/ishift)

Shift for integer functions.

[`iscale_per_channel`](/documentation/Accelerate/BNNSActivation/iscale_per_channel)

Scale per channel for integer functions.

[`ioffset_per_channel`](/documentation/Accelerate/BNNSActivation/ioffset_per_channel)

Offset per channel for integer functions.

[`ishift_per_channel`](/documentation/Accelerate/BNNSActivation/ishift_per_channel)

Shift per channel for integer functions.

### Type Methods

[`integerLinearSaturate(scale:offset:shift:)`](/documentation/Accelerate/BNNSActivation/integerLinearSaturate(scale:offset:shift:))

Returns an activation function that computes an arithmetic shift, preserving sign.

[`integerLinearSaturatePerChannel(scale:offset:shift:)`](/documentation/Accelerate/BNNSActivation/integerLinearSaturatePerChannel(scale:offset:shift:))

Returns an activation function that computes an arithmetic shift, preserving sign for each channel.

### Type Properties

[`identity`](/documentation/Accelerate/BNNSActivation/identity)

Identity activation function.


---

Copyright &copy; 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)