Fix data_time is not synchronized in the log 修复日志中 datatime 没有多进程同步的问题

[OpenMMLab-Assistant-004]

Fix data_time is not synchronized in the log

修复日志中 datatime 没有多进程同步的问题

In distributed training, time has been synchronized across different GPUs due to one automatic sync when doing backwards thanks for ddp's support, but not with datatime.

分布式训练时，训练日志中的 time 是经过多卡同步的（得益于 DDP 的 backward 会自动做一次同步），而 data_time 没有经过同步。希望日志中的 data_time 也可以多卡同步。

Task Information

Repository：MMEngine

Difficulty：Medium

Points：30

Estimated Time Consumption：14 days

Task Status

Claimant's Github ID：None

Claim Time：None

PR Link：None

Points to Note

To claim the task, please reply Claim the mission in the comment section. After claiming the task, please add our assistant bot called MeowMewo on WeChat at: openmmlabwx.

After completing the task, please submit a PR with the title starting with [MMSIG]. After submission, please reply with your PR link in the comments section of this Discussion. We will review your work as soon as possible.

在评论区回复 Claim the mission 领取任务，领取任务后请及时添加小助手喵喵微信: openmmlabwx

完成任务后提交相关链接（如是PR，标题请以[MMSIG]开头）回复到本Disucssion评论区，我们会第一时间审核您的贡献。