* [Improve] Speed up data preprocessor. * Add ClsDataSample serialization override functions. * Add unit tests * Modify configs to fit new mixup args. * Fix `num_classes` of the ImageNet-21k config. * Update docs.
* add twins backbone * add position_encoding * refactor twins * Supplemental unit tests * update docstring and readme * update docstring and readme * update docstring and readme * update docstring * update docstring * update docstring * update docstring * remove note * update doc and docstring * update docstring * update docstring * use abstract pdf link and rename yamlfile * Update model link Co-authored-by: mzr1996 <mzr1996@163.com>