moreNj_2_splitScp

[wanglong001]

using utils/split_scp.pl, --NJ must be little than num of speakers. it's not good for me to train.

./utils/split_scp.2.pl: Refusing to split data because number of speakers 2 is less than the number of output .scp files 4

and i want to fix it.

1. Previously in speaker units, now in different classes of utt units.
2. Different classes are more evenly distributed in each split

[danpovey]

This would break certain things, e.g. in SAT training, FMLLR. You can split with --per-utt if this becomes a constraint, but it may require script changes.