Where is auto_fp16?

[sandeepnmenon]

I am migrating my codebase to the latest mmcv version (2.0.1). I am not able to figure out where is auto_fp16. I searched in the repo and it is not there.
Similarly functions like
. force_fp32
. EpochBasedRunner
. DistSamplerSeedHook
. Fp16OptimizerHook
and many more. I am not able to find a good migration guide.
Where can I import these functions from?