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torch.nansum — PyTorch 2.7 documentation

torch.nansum(input, *, dtype=None) → Tensor¶

Returns the sum of all elements, treating Not a Numbers (NaNs) as zero.

Parameters

input (Tensor) – the input tensor.

Keyword Arguments

dtype (torch.dtype, optional) – the desired data type of returned tensor. If specified, the input tensor is casted to dtype before the operation is performed. This is useful for preventing data type overflows. Default: None.

Example:

>>> a = torch.tensor([1., 2., float('nan'), 4.])
>>> torch.nansum(a)
tensor(7.)

torch.nansum(input, dim, keepdim=False, *, dtype=None) → Tensor

Returns the sum of each row of the input tensor in the given dimension dim, treating Not a Numbers (NaNs) as zero. If dim is a list of dimensions, reduce over all of them.

If keepdim is True, the output tensor is of the same size as input except in the dimension(s) dim where it is of size 1. Otherwise, dim is squeezed (see torch.squeeze()), resulting in the output tensor having 1 (or len(dim)) fewer dimension(s).

Parameters

• input (Tensor) – the input tensor.

• dim (int or tuple of ints, optional) – the dimension or dimensions to reduce. If None, all dimensions are reduced.

• keepdim (bool) – whether the output tensor has dim retained or not.

Keyword Arguments

dtype (torch.dtype, optional) – the desired data type of returned tensor. If specified, the input tensor is casted to dtype before the operation is performed. This is useful for preventing data type overflows. Default: None.

Example:

>>> torch.nansum(torch.tensor([1., float("nan")]))
tensor(1.)
>>> a = torch.tensor([[1, 2], [3., float("nan")]])
>>> torch.nansum(a)
tensor(6.)
>>> torch.nansum(a, dim=0)
tensor([4., 2.])
>>> torch.nansum(a, dim=1)
tensor([3., 3.])

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