How to generate train_set

How to generate the train_set for each sequence?
For example, the sequence of 00 contains 4541 scans. The total number of overlaps ratio is 4541 x 4541 = 20620681.
In your split_train_val.py, the ratio of training and testing are 0.9 and 0.1, so the number of training data is 20620681 x 0.9 = 18558612.9.
But in your train_set of sequence 00, the size of overlaps is 90738 x 3.