torch.Tensor.index_fill_

torch.Tensor.index_fill_(dim, index, value) → Tensor

Fills the elements of the self tensor with value value by selecting the indices in the order given in index.

Parameters

• dim (int) – dimension along which to index

• index (LongTensor) – indices of self tensor to fill in

• value (float) – the value to fill with

Example::

>>> x = torch.tensor([[1, 2, 3], [4, 5, 6], [7, 8, 9]], dtype=torch.float)
>>> index = torch.tensor([0, 2])
>>> x.index_fill_(1, index, -1)
tensor([[-1.,  2., -1.],
        [-1.,  5., -1.],
        [-1.,  8., -1.]])

再看一个例子：

a = torch.zeros((2, 5))
index = torch.LongTensor([0, 2])

a.index_fill(1, index, 1)
>>> tensor([[1., 0., 1., 0., 0.],
            [1., 0., 1., 0., 0.]])