---
title: "ClikaRT::nn::Unfold"
sidebar_label: "Unfold"
description: "Extracts sliding windows from a channels-last input [N, D1..Dn, C] into [N, L, prod(kernel_size), C], one row per window placement."
---

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

Extracts sliding windows from a channels-last input `[N, D1..Dn, C]` into `[N, L, prod(kernel_size), C]`, one row per window placement. The module form of [`ClikaRT::ops::unfold`](../ops/unfold.md#unfold), which documents the full contract (shapes, dtypes, errors); construct once, then call it like a function.

## Member functions

### Unfold(UnfoldOptions) {#Unfold}

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`explicit` **`Unfold`**([`UnfoldOptions`](./UnfoldOptions.md) `options`)

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Constructs the module from [`options`](./Unfold.md#options).

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Declared in `ClikaRT/nn/generated/fold.h`, line 225

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### Unfold(vector\<int64\_t\>) {#Unfold-2}

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`explicit` **`Unfold`**(`std::vector<std::int64_t>` `kernel_size`)

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`Unfold(kernel_size)`: the positional form of `UnfoldOptions(kernel_size)`.

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Declared in `ClikaRT/nn/generated/fold.h`, line 228

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

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Declared in `ClikaRT/nn/generated/fold.h`, line 243

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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`](./Unfold.md#forward).

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Declared in `ClikaRT/nn/generated/fold.h`, line 247

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### options() {#options}

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

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The settings this module was constructed with.

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Declared in `ClikaRT/nn/generated/fold.h`, line 251

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