fix fillna bug (#1914)

* fix fillna bug

* fix flake8 error

* fix pylint error

* update ubuntu version for action

* fix pytest error

* fix pylint error

* fix black error

* fix pylint error

* add Fillna test

* fix black error

* add  instruments

* remove code

pyproject.toml

@@ -23,9 +23,6 @@ description = "A Quantitative-research Platform"
 requires-python = ">=3.8.0"
 readme = {file = "README.md", content-type = "text/markdown"}
 
-# On 2025-04-02 osqp released version 1.0.2, osqp is used as a dependency for cvxpy. 
-# It would lead to errors installing qlib, so we limited the version of osqp.
-# refs: https://github.com/osqp/osqp/issues/728
 dependencies = [
   "pyyaml",
   "numpy",
@@ -42,7 +39,6 @@ dependencies = [
   "loguru",
   "lightgbm",
   "gym",
-  "osqp<1.0.2",
   "cvxpy",
   "joblib",
   "matplotlib",