---
title: "ClikaRT::nn::Softplus"
sidebar_label: "Softplus"
description: "Smooth ReLU: log(1 + exp(beta * input)) / beta, switching to the exact linear input where beta * input exceeds threshold."
---

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**Header:** `ClikaRT/nn/generated/activation.h`  
**Inherits:** [`ClikaRT::nn::Module`](./Module.md)

Smooth [ReLU](./ReLU.md): log(1 + exp(beta \* input)) / beta, switching to the exact linear input where beta \* input exceeds threshold. The module form of [`ClikaRT::ops::softplus`](../ops/softplus.md#softplus), which documents the full contract (shapes, dtypes, errors); construct once, then call it like a function.

## Member functions

### Softplus(SoftplusOptions) {#Softplus}

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`explicit` **`Softplus`**([`SoftplusOptions`](./SoftplusOptions.md) `options` `=` `{}`)

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Constructs the module from [`options`](./Softplus.md#options) (every default when omitted).

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Declared in `ClikaRT/nn/generated/activation.h`, line 968

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### Softplus(double, double) {#Softplus-2}

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`explicit` **`Softplus`**(`double` `beta`, `double` `threshold` `=` `20.0`)

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`Softplus(beta, threshold)`: the positional form of `SoftplusOptions(beta, threshold)`.

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Declared in `ClikaRT/nn/generated/activation.h`, line 971

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### forward() {#forward}

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[`Tensor`](../Tensor.md) **`forward`**([`Tensor`](../Tensor.md) `input`) `const`

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[`forward_impl`](./Softplus.md#forward), unwrapped: raises [`ClikaRT::Error`](../Error.md) on failure.

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Declared in `ClikaRT/nn/generated/activation.h`, line 984

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### operator()() {#operator-call}

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[`Tensor`](../Tensor.md) **`operator()`**([`Tensor`](../Tensor.md) `input`) `const`

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Same as [`forward`](./Softplus.md#forward).

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Declared in `ClikaRT/nn/generated/activation.h`, line 988

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### options() {#options}

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`const` [`SoftplusOptions`](./SoftplusOptions.md)`&` **`options`**() `const`

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The settings this module was constructed with.

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Declared in `ClikaRT/nn/generated/activation.h`, line 992

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