---
title: "ClikaRT::ops::atanh"
sidebar_label: "atanh"
description: "Elementwise inverse hyperbolic tangent. \\[ \\tanh^{-1}(x_i) \\] Inputs outside (-1, 1) produce NaN / ±inf. Value-domain violations follow IEEE semantics (NaN / ±inf in the result), never an error."
---

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

## atanh() {#atanh}

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[`Tensor`](../Tensor.md) **`atanh`**([`Tensor`](../Tensor.md) `input`)

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Elementwise inverse hyperbolic tangent.

$$
\tanh^{-1}(x_i)
$$

Inputs outside `(-1, 1)` produce NaN / ±inf. Value-domain violations follow IEEE semantics (NaN / ±inf in the result), never an error.

**Throws**

- `ClikaRT::Error`: when the input's dtype is not served for this operation (the machine-readable reason rides `code_name()`).

**Returns:** a new tensor, same shape and dtype as `input`.

```cpp
auto y = ClikaRT::ops::atanh(x);
```

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Declared in `ClikaRT/compute/ops.h`, line 4891

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