* fix mypy error
* updating DIRECTORY.md
* simplify code
* run black
* fix doc consistency
* Fix doc
* fix doc
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
* fix mypy error
* updating DIRECTORY.md
* simplify code
* run black
* fix doc consistency
* Fix doc
* fix doc
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>