* Add tutorials for V2.0

* Add details for dataset tutorial

* add tutorials in index.rst

* Add tutorials for concat data

* Modify documents

* More contents

* add model upgrade tool

* Add configs and scripts for converting v1.x models to v2.0

* add doc

* Add more models

* Pass CI

* Clean scripts and check model by config

* Resolve comments

* Resolve small comments

Co-authored-by: Jiarui XU <xvjiarui0826@gmail.com>

* Add documentation

* Fix (doc): fix syntax error

* Add details about hyper parameters

* Add name convention

* Update compatibility docs