# tensorplay.functional.isnan

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

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

Returns a new tensor with boolean elements representing if each element of input
is NaN or not. Complex values are considered NaN when either their real
and/or imaginary part is NaN.

Parameters:

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

Returns:

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

Example:

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