---
title: "ClikaRT::ops::unsqueeze"
sidebar_label: "unsqueeze"
description: "Insert a size-1 dim at dim. The position is normalized against the OUTPUT rank, so -1 appends at the trailing end. Returns a view (no copy)."
---

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

## unsqueeze() {#unsqueeze}

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[`Tensor`](../Tensor.md) **`unsqueeze`**([`Tensor`](../Tensor.md) `input`, `int64_t` `dim`)

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Insert a size-1 dim at `dim`. The position is normalized against the OUTPUT rank, so `-1` appends at the trailing end. Returns a view (no copy).

**Throws**

- `ClikaRT::Error`: (`INVALID_ARGUMENT`) when `dim` is outside the output's rank (`code_name()` carries the reason).

**Returns:** a view of `input` with rank + 1.

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Declared in `ClikaRT/compute/ops.h`, line 3558

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