perf: zero_grad(set_to_none=True) and reduce checkpoint I/O#83

anxiangsir merged 2 commits intomainEvolvingLMMs-Lab/OneVision-Encoder:mainfrom

perf/zero-grad-and-checkpoint-ioEvolvingLMMs-Lab/OneVision-Encoder:perf/zero-grad-and-checkpoint-ioCopy head branch name to clipboard