accelerate

6e70e79e - Support wrapping multiple models in Accelerator.accumulate() (#1708)

Support wrapping multiple models in Accelerator.accumulate() (#1708) * Support wrapping multiple models in Accelerator.accumulate() * Fix style. * Rename variable Co-authored-by: Zach Mueller <muellerzr@gmail.com> * Update doc. Co-authored-by: Zach Mueller <muellerzr@gmail.com> * Update variable name. --------- Co-authored-by: YU Xinyuan <yuxinyuan02@corp.netease.com> Co-authored-by: Zach Mueller <muellerzr@gmail.com>