Why is the ground truth calculated during training?

[MrLuer]

Why not calculate it before training starts so there are no duplicate calculations?

[zh7117]

Maybe not all the pairs are used in training.
there are 368 scenes. According the author's strategy, totally 30 epoch, randomly sample 100 pairs per scene every epoch. So the total training pairs are 30 * 368 * 100 = 1104000.
while the total number of pairs is 8M+