Which training instances are being subsampled in each iteration?

Hi,

Is there any way of extracting a list of which observations being used in each iteration when I apply subsampling?

As far as I understand, if I set (e.g.) subsample = 0.5 in params, then 50% of the training data is being sampled at each iteration. I would like to access a list of exactly which training instances that were used in each iteration.