Second, the effect of combination should be considered; that is, the number of pairs whose maximum number is 2 × |L d | × |L e | for a given N. When N = 600, this amounts to 720,000 training pairs, which is too large in terms of the time required for training.
by fixing N = 100, we tested the learning effect for numbers of training pairs up to 2 × 100 × {1, 5, 10, 50, 100}.