[NFC] polish colossalai/nn/parallel/data_parallel.py code style (#1570)

Co-authored-by: JThh <jiatong.han@u.nus.edu>
This commit is contained in:
Jiatong Han 2022-09-08 16:33:14 +08:00 committed by Frank Lee
parent f566c9b98d
commit 3263cdf57f