GitLab

* fix lint for graph_index.py

* pylint for base.py

* pylint for batched_graph.py

* pylint for frame.py; simplify and fix bugs in frame when index is slice type

* pylint for graph.py

* pylint for immutable_graph_index.py

* pylint for init.py

* pylint for rest files in root package

* pylint for _ffi package

* pylint for function package

* pylint for runtime package

* pylint for runtime.ir package

* add pylint to ci

* fix mx tests

* fix lint errors

* fix ci

* fix as requested

* fix lint

* add sse tutorial

* add mxnet tutorial ci

* fix ci

* fix ci

* fix ci

* fix ci

* fix ci

* fix ci

* Fix ci

* Fix ci

* Fix ci

* fix ci

* fix ci

* fix ci

* fix ci

* fix ci

* fix ci

* Fix CI

Fix CI image

* permission fix

* fix a bug in the code.

* small fix

* fix doc

* fix ci

* shorten the iters

* fix

* remove extra file

* add load_backend api to dynamically switch to another backend

* try fix

* fix tutorial

* fix tutorial

* fix bug in tutorial