---
title: "ClikaRT::nn::NLLLossOptions"
sidebar_label: "NLLLossOptions"
description: "Settings of NLLLoss: chain the setters, or assign the fields."
---

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

**Header:** `ClikaRT/nn/generated/loss.h`

Settings of [`NLLLoss`](./NLLLoss.md): chain the setters, or assign the fields.

## Member functions

### weight(OptionalTensor) {#weight}

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[`NLLLossOptions`](./NLLLossOptions.md)`&` **`weight`**([`OptionalTensor`](../../index.md#OptionalTensor) `v`)

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Sets [`weight`](./NLLLossOptions.md#weight), a per-class weight `[C]`; unset weighs every class 1.

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Declared in `ClikaRT/nn/generated/loss.h`, line 303

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### weight() {#weight-2}

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`const` [`OptionalTensor`](../../index.md#OptionalTensor)`&` **`weight`**() `const`

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Reads [`weight`](./NLLLossOptions.md#weight).

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Declared in `ClikaRT/nn/generated/loss.h`, line 305

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### ignore\_index(optional\<int64\_t\>) {#ignore_index}

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[`NLLLossOptions`](./NLLLossOptions.md)`&` **`ignore_index`**(`std::optional<std::int64_t>` `v`)

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Sets [`ignore_index`](./NLLLossOptions.md#ignore_index), a target value whose positions contribute no loss; unset masks nothing.

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Declared in `ClikaRT/nn/generated/loss.h`, line 311

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### ignore\_index() {#ignore_index-2}

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`const std::optional<std::int64_t>&` **`ignore_index`**() `const`

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Reads [`ignore_index`](./NLLLossOptions.md#ignore_index).

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Declared in `ClikaRT/nn/generated/loss.h`, line 316

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### reduction(ops::Reduction) {#reduction}

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[`NLLLossOptions`](./NLLLossOptions.md)`&` **`reduction`**([`ops::Reduction`](../ops/index.md#Reduction) `v`)

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Sets [`reduction`](./NLLLossOptions.md#reduction), how the per-position losses reduce.

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Declared in `ClikaRT/nn/generated/loss.h`, line 322

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### reduction() {#reduction-2}

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[`ops::Reduction`](../ops/index.md#Reduction) **`reduction`**() `const`

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Reads [`reduction`](./NLLLossOptions.md#reduction).

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Declared in `ClikaRT/nn/generated/loss.h`, line 324

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## Data members

### weight\_ {#weight_}

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[`OptionalTensor`](../../index.md#OptionalTensor) **`weight_`** `= {}`

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A per-class weight `[C]`; unset weighs every class 1. Default `{}`.

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Declared in `ClikaRT/nn/generated/loss.h`, line 307

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### ignore\_index\_ {#ignore_index_}

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`std::optional<std::int64_t>` **`ignore_index_`** `= std::nullopt`

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A target value whose positions contribute no loss; unset masks nothing. Default `std::nullopt`.

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Declared in `ClikaRT/nn/generated/loss.h`, line 319

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### reduction\_ {#reduction_}

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[`ops::Reduction`](../ops/index.md#Reduction) **`reduction_`** `=` [`ops::Reduction::Mean`](../ops/index.md#Reduction)

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How the per-position losses reduce. Default [`ops::Reduction::Mean`](../ops/index.md#Reduction).

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Declared in `ClikaRT/nn/generated/loss.h`, line 326

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