---
title: tanh
framework: accelerate
role: symbol
role_heading: Type Property
path: accelerate/bnnsactivationfunction/tanh
---

# tanh

An activation function that returns the hyperbolic tangent of its input.

## Declaration

```swift
static var tanh: BNNSActivationFunction { get }
```

## Mentioned in

Using Long Short-Term Memory Layers (LSTM)

## Discussion

Discussion This constant defines an activation function that returns values using the following operation: tanh(x) The following illustrates the output that the activation function generates from inputs in the range -10...10:

## See Also

### Activation Functions

- [abs](accelerate/bnnsactivationfunction/abs.md)
- [clamp](accelerate/bnnsactivationfunction/clamp.md)
- [identity](accelerate/bnnsactivationfunction/identity.md)
- [integerLinearSaturate](accelerate/bnnsactivationfunction/integerlinearsaturate.md)
- [integerLinearSaturatePerChannel](accelerate/bnnsactivationfunction/integerlinearsaturateperchannel.md)
- [leakyRectifiedLinear](accelerate/bnnsactivationfunction/leakyrectifiedlinear.md)
- [linear](accelerate/bnnsactivationfunction/linear.md)
- [rectifiedLinear](accelerate/bnnsactivationfunction/rectifiedlinear.md)
- [scaledTanh](accelerate/bnnsactivationfunction/scaledtanh.md)
- [sigmoid](accelerate/bnnsactivationfunction/sigmoid.md)
- [softmax](accelerate/bnnsactivationfunction/softmax.md)