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Showing content from https://docs.pytorch.org/docs/stable/generated/torch.vdot.html below:

torch.vdot — PyTorch 2.8 documentation

Computes the dot product of two 1D vectors along a dimension.

In symbols, this function computes

∑ i = 1 n x i ‾ y i . \sum_{i=1}^n \overline{x_i}y_i. i=1∑n​xi​​yi​.

where x i ‾ \overline{x_i} xi​​ denotes the conjugate for complex vectors, and it is the identity for real vectors.

Note

Unlike NumPy’s vdot, torch.vdot intentionally only supports computing the dot product of two 1D tensors with the same number of elements.

Parameters

• input (Tensor) – first tensor in the dot product, must be 1D. Its conjugate is used if it’s complex.

• other (Tensor) – second tensor in the dot product, must be 1D.

Keyword args:

Note

out (Tensor, optional): the output tensor.

Example:

>>> torch.vdot(torch.tensor([2, 3]), torch.tensor([2, 1]))
tensor(7)
>>> a = torch.tensor((1 +2j, 3 - 1j))
>>> b = torch.tensor((2 +1j, 4 - 0j))
>>> torch.vdot(a, b)
tensor([16.+1.j])
>>> torch.vdot(b, a)
tensor([16.-1.j])

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