---
title: activation
framework: accelerate
role: symbol
role_heading: Instance Property
path: accelerate/bnnslayerparametersarithmetic/activation
---

# activation

The activation function that the layer applies to the output.

## Declaration

```swift
var activation: BNNSActivation
```

## See Also

### Instance Properties

- [arithmetic_function](accelerate/bnnslayerparametersarithmetic/arithmetic_function.md)
- [arithmetic_function_fields](accelerate/bnnslayerparametersarithmetic/arithmetic_function_fields.md)