The time consumed in caculating re_ranking

[BravoLu]

When I use your code to run in larger dataset, it consumed lots of time to caculate the re_ranking. I wonder how much time you consume in it when training

[lsongx]

@BravoLu For Market, it does not take too much time. If your dataset is too large, you can randomly split it into few chunks and then running re_ranking on these chunks