Add blocks of values to a tensor at specific locations in PyTorch

Question

I have a list of indeces:

indx = torch.LongTensor(
   [[ 0,  2,  0],
    [ 0,  2,  4],
    [ 0,  4,  0],
    [ 0, 10, 14],
    [ 1,  4,  0],
    [ 1,  8,  2],