# tensorplay.functional.isinf

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

```python
tensorplay.functional.isinf(input) → Tensor
```

Tests if each element of input is infinite
(positive or negative infinity) or not.

> **Note**
>
> Complex values are infinite when their real or imaginary part is infinite.

Parameters:

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

Returns:

A boolean tensor that is True where input is infinite and False elsewhere

Example:

```
>>> tensorplay.isinf(tensorplay.tensor([1, float('inf'), 2, float('-inf'), float('nan')]))
tensor([False,  True,  False,  True,  False])
```