# tensorplay.functional.acos

Source: https://www.tensorplay.cn/docs/generated/tensorplay.functional.acos.html

```python
tensorplay.functional.acos(input: Tensor, *, out: Tensor | None) → Tensor
```

Computes the inverse cosine of each element in input.

$$\text{out}_{i} = \cos^{-1}(\text{input}_{i})$$

Parameters:

input ([Tensor](/docs/generated/tensorplay.Tensor.html#tensorplay.Tensor)) – the input tensor.

Keyword Arguments:

out ([Tensor](/docs/generated/tensorplay.Tensor.html#tensorplay.Tensor), optional) – the output tensor.

Example:

```
>>> a = tensorplay.randn(4)
>>> a
tensor([ 0.3348, -0.5889,  0.2005, -0.1584])
>>> tensorplay.acos(a)
tensor([ 1.2294,  2.2004,  1.3690,  1.7298])
```