Access 3D tensor (image) using a 2d tensor of indices
With the following 3D tensor representing an image 
img.shape=[H,W,F]
And a tensor representing the indices to that img 
indices.shape=[N,2]
E.g. if indices = [[0,1],[5,3],...]]
I would like to create a new tensor of shape new.shape=[N,F] where new[k] == img[indices[k][0],indices[k][1]]
Currently to solve this I flatten both tensors:
    idx_flattened = idx_flattened [:,0] * (idx_flattened [:,1].max()+1) + idx_flattened[:,1]
    img = img .reshape(-1,F)
    new = img[idx_flattened ]

But I'm certain there is a better way:)
Here's a full minimal example:
img = torch.arange(8*10*3).reshape(8,10,3)
indices = torch.tensor([[0,0],[3,0],[1,2]])
new = img[indices] &lt;- This does not work
new = [[  0,   1,   2],[ 90,  91,  92],[ 36,  37,  38]]

Ideas?

Slicing would work
img[indices[:,0], indices[:,1]]
tensor([[ 0,  1,  2],
        [90, 91, 92],
        [36, 37, 38]])

