Computes the n-th forward difference along the given dimension.
The first-order differences are given by out[i] = input[i + 1] - input[i]. Higher-order differences are calculated by using torch.diff() recursively.
>>> a = torch.tensor([1, 3, 2])
>>> torch.diff(a)
tensor([ 2, -1])
>>> b = torch.tensor([4, 5])
>>> torch.diff(a, append=b)
tensor([ 2, -1, 2, 1])
>>> c = torch.tensor([[1, 2, 3], [3, 4, 5]])
>>> torch.diff(c, dim=0)
tensor([[2, 2, 2]])
>>> torch.diff(c, dim=1)
tensor([[1, 1],
[1, 1]])
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