# tensorplay.functional.isneginf

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

```python
tensorplay.functional.isneginf(input, *, out=None) → Tensor
```

Tests if each element of input is negative infinity or not.

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.tensor([-float('inf'), float('inf'), 1.2])
>>> tensorplay.isneginf(a)
tensor([ True, False, False])
```