torch.is_nonzero

torch.is_nonzero(input)

如果 input 是一個在型別轉換後不等於零的單元素張量，則返回 True。即不等於 torch.tensor([0.]) 或 torch.tensor([0]) 或 torch.tensor([False])。如果 torch.numel() != 1（即使是稀疏張量），則丟擲 RuntimeError。

引數

input (Tensor) – 輸入張量。

示例

>>> torch.is_nonzero(torch.tensor([0.]))
False
>>> torch.is_nonzero(torch.tensor([1.5]))
True
>>> torch.is_nonzero(torch.tensor([False]))
False
>>> torch.is_nonzero(torch.tensor([3]))
True
>>> torch.is_nonzero(torch.tensor([1, 3, 5]))
Traceback (most recent call last):
...
RuntimeError: Boolean value of Tensor with more than one value is ambiguous
>>> torch.is_nonzero(torch.tensor([]))
Traceback (most recent call last):
...
RuntimeError: Boolean value of Tensor with no values is ambiguous