---
title: "ClikaRT::nn::CrossEntropyLoss"
sidebar_label: "CrossEntropyLoss"
description: "Cross entropy over class logits with the class axis last: the log-softmax followed by the negative log-likelihood."
---

<!-- Generated by tools/doxygen2mdx from Doxygen XML. Do not edit. -->

<span class="api-kind api-kind--class">class</span>

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

Cross entropy over class logits with the class axis last: the log-softmax followed by the negative log-likelihood. The module form of [`ClikaRT::ops::cross_entropy`](../ops/cross_entropy.md#cross_entropy), which documents the full contract (shapes, dtypes, errors); construct once, then call it like a function.

## Member functions

### CrossEntropyLoss() {#CrossEntropyLoss}

<div class="api-signature">

`explicit` **`CrossEntropyLoss`**([`CrossEntropyLossOptions`](./CrossEntropyLossOptions.md) `options` `=` `{}`)

</div>

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

<div class="api-declared">

Declared in `ClikaRT/nn/generated/loss.h`, line 407

</div>

### forward() {#forward}

<div class="api-signature">

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

</div>

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

<div class="api-declared">

Declared in `ClikaRT/nn/generated/loss.h`, line 421

</div>

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

<div class="api-signature">

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

</div>

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

<div class="api-declared">

Declared in `ClikaRT/nn/generated/loss.h`, line 425

</div>

### options() {#options}

<div class="api-signature">

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

</div>

The settings this module was constructed with.

<div class="api-declared">

Declared in `ClikaRT/nn/generated/loss.h`, line 429

</div>