GitLab

* add model registry

* fixed infer scoep

* fixed build func

* add docstring

* add md

* support multi level

* clean comments

* add docs

* fixed parent

* add more doc

* add value error, add docstring

* fixed docs

* change to local/global search

* resolve comments

* fixed test

* update some docstring

* update docs (minior)

* update docs

* update docs

* fix typo in docs

* add contents

* resolve typo

* add documentations for registry

* update example

* update sphinx

* add intro

* resolve comments