Bartosz Kuncer

## Description ## This change adds assert for _doc_stride_, _max_seq_length_ and _max_query_length_ relation (`args.doc_stride

## Description ## Fixes ETA for eval_validation when max_seq_length has been changed. Fixes: https://github.com/dmlc/gluon-nlp/issues/1586 w/o the fix:  with:  cc @dmlc/gluon-nlp-team

## Description ## This change introduces sorting of chunks before executing evaluation to reduce padding to minimum and in this way improve performance. ### How the change works ### As...

## Description When you change max_seq_length value from 512 the ETA in eval_validation function does not end on 0. ### Error Message  ## To Reproduce Change max_seq_length to e.g....