paddle. isnan ( x, name=None ) [source]

Return whether every element of input tensor is NaN or not.

  • x (Tensor) – The input tensor, it’s data type should be float16, float32, float64, int32, int64.

  • name (str, optional) – Name for the operation (optional, default is None). For more information, please refer to Name.


Tensor, the bool result which shows every element of x whether it is NaN or not.


>>> import paddle

>>> x = paddle.to_tensor([float('-inf'), -2, 3.6, float('inf'), 0, float('-nan'), float('nan')])
>>> out = paddle.isnan(x)
>>> out
Tensor(shape=[7], dtype=bool, place=Place(cpu), stop_gradient=True,
[False, False, False, False, False, True , True ])