* style: add python lint & pre-commit

* style: use pre-commit to lint fe codes

* fix: show raw shape of tensor in high-dimensional chart

* feat: implement random sampling in high-dimensional chart

* feat: add fog in scatter chart

* feat: focus hovered point in high-dimensional chart

* chore: hide unfulfilled features

* chore: update dependencies

* fix: fix lost import

* style: fix style lint

* chore: fix typo

* bump 2.1.0

* add `file_name` in LogWriter(0 for rewriting.

* fix reviews