accelerate

a5525406 - separate dataloader generator from sampler generator (#789)

separate dataloader generator from sampler generator (#789) * separate dataloader and sampler generator * resolving comments Co-Authored-By: YouJiacheng <1503679330@qq.com> Co-Authored-By: Sylvain Gugger <35901082+sgugger@users.noreply.github.com> * minor comment resolution Co-authored-by: YouJiacheng <1503679330@qq.com> Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>