* update space_mixin
* update NAS algorithms with SpaceMixin
* update pruning algorithms with SpaceMixin
* fix ut
* fix comments
* revert _load_fix_subnet_by_mutator
* fix dcff test
* add ut for registry
* update autoslim_greedy_search
* fix repeat-mutables bug
* fix slice_weight in export_fix_subnet
* Update NasMutator:
1. unify mutators for NAS algorithms as the NasMutator;
2. regard ChannelMutator as pruning-specified;
3. remove value_mutators & module_mutators;
4. set GroupMixin only for NAS;
5. revert all changes in ChannelMutator.
* update NAS algorithms using NasMutator
* update channel mutator
* update one_shot_channel_mutator
* fix comments
* update UT for NasMutator
* fix isort version
* fix comments
---------
Co-authored-by: gaoyang07 <1546308416@qq.com>
Co-authored-by: liukai <your_email@abc.example>