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

# activation

The activation function that the layer applies to the output.

## Declaration

```swift
var activation: BNNSActivation
```

## See Also

### Instance Properties

- [i_desc](accelerate/bnnslayerparametersactivation/i_desc.md)
- [o_desc](accelerate/bnnslayerparametersactivation/o_desc.md)
- [axis_flags](accelerate/bnnslayerparametersactivation/axis_flags.md)