GitLab

* Use black for formatting

* limit line width to 80 characters.

* Use a backslash instead of directly concatenating

* file structure adjustment.

* file structure adjustment(2)

* codes for citation2

* format slight adjustment

* adjust format in models.py

* now it runs normally for all datasets.

* add comments; adjust code order.

* adjust indenting.
Co-authored-by: Mufei Li <mufeili1996@gmail.com>