implement PAA assign (#3547)

* implement PAA assign

* unpate setup.cfg

* fix multiply ioupred with clsscore

* add score voting

* add 2x and 101 configs

* add voting return

* make sklearm optional

* remove sklearm in setup.cfg

* separate pos loss calculation from reassign

* add unitest and readme

* add model url

* fix reduction and doc

* add 1.5x

* fix config base

* add r50 1.5x results

* mock skm

* change according to comment

* remove return none

* add universal partition interface

* fix docstr

* fix docstr

* fix docstr