I have a 3-d tensor data of shape block X example X label.
I have another 2-d tensor index of shape n X block.
I am looking to select a slice from data to match the index, such that for each row of index I pick the corresponding example's label.
I realized that it is hard to explain what I am trying to do, so to give an example.
Let’s say a row in index looks like - [10, 20, 30, 40, 50].
For this row, I want to select the following elements from data - (0,:,10) , (1,:,20), (2,:,30), (3,:,40), (4,:,50)
My final output will then have a shape of n X block X example
Is there a clean and efficient way to do it?