Question about _normalize_feat function

[AaamberW]

Could you help me understanding what this function does? Looks like cur_feat was modified(line 267-270) but not returned or used afterwards. Thanks!

[AliVard]

cur_feat is a pointer to feature_matrix[s_i:e_i,:], so any change on cur_feat is reflected on that part of feature_matrix.
The function normalizes feature_matrix inplace.

[AaamberW]

Thanks, could you also comment on why qid:qid+2 for every start and end index pair?

[AliVard]

You're welcome.
query_ranges[qid] contains the start index of query qid.
s_i, e_i = query_ranges[qid:qid+2] is a short version for:
s_i = query_ranges[qid] and e_i = query_ranges[qid+1]