* Intermediate version
* Fix yaml template & Successfully run rolling
* Be compatible with benchmark
* Get same results with previous linear model
* Black formatting
* Update black
* Update the placeholder mechanism
* Update CI
* Update CI
* Upgrade Black
* Fix CI and simplify code
* Fix CI
* Move the data processing caching mechanism into utils.
* Adjusting DDG-DA
* Organize import
* fix gramma error in doc strings
* fix typos in exchange.py
* fix typos and gramma errors
* fix typo and rename function param to avoid shading python keyword
* remove redundant parathesis; pass kwargs to parent class
* fix pyblack
* further correction
* assign -> be assigned to
* Commit the code of HIST and IGMTF on Alpha360
* add stock index
* Update README.md
* delete useless code
* fix the bug of code format with black
* fix pylint bugs
* fix the bugs of pylint
* fix pylint bugs
* fix flake8