---
title: "ClikaRT::nn::KLDivLoss"
sidebar_label: "KLDivLoss"
description: "Kullback-Leibler divergence of target from input, where input holds log-probabilities."
---

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

Kullback-Leibler divergence of `target` from `input`, where `input` holds log-probabilities. The module form of [`ClikaRT::ops::kl_div`](../ops/kl_div.md#kl_div), which documents the full contract (shapes, dtypes, errors); construct once, then call it like a function.

## Member functions

### KLDivLoss() {#KLDivLoss}

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`explicit` **`KLDivLoss`**([`KLDivLossOptions`](./KLDivLossOptions.md) `options` `=` `{}`)

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

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Declared in `ClikaRT/nn/generated/loss.h`, line 268

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### forward() {#forward}

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

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

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Declared in `ClikaRT/nn/generated/loss.h`, line 282

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

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

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

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Declared in `ClikaRT/nn/generated/loss.h`, line 286

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### options() {#options}

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

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The settings this module was constructed with.

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Declared in `ClikaRT/nn/generated/loss.h`, line 290

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