[Chore] simplify annotations (#27)

- Simplify annotations and remove too much docstring
- Simplify objective

mqboost/base.py

@@ -1,5 +1,5 @@
 from enum import Enum
-from typing import Callable, Dict, List, Union
+from typing import Callable
 
 import lightgbm as lgb
 import numpy as np
@@ -23,11 +23,12 @@ def _isin(cls, text: str) -> None:
 
 
 # Type
-XdataLike = Union[pd.DataFrame, pd.Series, np.ndarray]
-YdataLike = Union[pd.Series, np.ndarray]
-AlphaLike = Union[List[float], float]
-ModelLike = Union[lgb.basic.Booster, xgb.Booster]
-DtrainLike = Union[lgb.basic.Dataset, xgb.DMatrix]
+XdataLike = pd.DataFrame | pd.Series | np.ndarray
+YdataLike = pd.Series | np.ndarray
+AlphaLike = list[float] | float
+ModelLike = lgb.basic.Booster | xgb.Booster
+DtrainLike = lgb.basic.Dataset | xgb.DMatrix
+ParamsLike = dict[str, float | int | str | bool]
 
 
 # Name
@@ -59,7 +60,7 @@ def _lgb_predict_dtype(data: XdataLike):
     return data
 
 
-FUNC_TYPE: Dict[ModelName, Dict[TypeName, Callable]] = {
+FUNC_TYPE: dict[ModelName, dict[TypeName, Callable]] = {
     ModelName.lightgbm: {
         TypeName.train_dtype: lgb.Dataset,
         TypeName.predict_dtype: _lgb_predict_dtype,

mqboost/constraints.py

@@ -1,25 +1,30 @@
-from typing import Any, Dict
-
 import pandas as pd
 
-from mqboost.base import FUNC_TYPE, ModelName, MQStr, TypeName, ValidationException
+from mqboost.base import (
+    FUNC_TYPE,
+    ModelName,
+    MQStr,
+    ParamsLike,
+    TypeName,
+    ValidationException,
+)
 
 
 def set_monotone_constraints(
-    params: Dict[str, Any],
+    params: ParamsLike,
     columns: pd.Index,
     model_name: ModelName,
-) -> Dict[str, Any]:
+) -> ParamsLike:
     """
     Set monotone constraints in params
     Args:
-        params (Dict[str, Any])
+        params (ParamsLike)
         columns (pd.Index)
         model_name (ModelName)
     Raises:
         ValidationException: when "objective" is in params.keys()
     Returns:
-        Dict[str, Any]
+        ParamsLike
     """
     constraints_fucs = FUNC_TYPE.get(model_name).get(TypeName.constraints_type)
     if MQStr.obj.value in params:

mqboost/dataset.py

@@ -1,4 +1,4 @@
-from typing import Callable, List, Optional, Union
+from typing import Callable
 
 import pandas as pd
 
@@ -21,7 +21,7 @@ class MQDataset:
     It supports both LightGBM and XGBoost models, handling data preparation, validation, and conversion for training and prediction.
 
     Attributes:
-        alphas (List[float]):
+        alphas (list[float]):
             List of quantile levels.
             Must be in ascending order and contain no duplicates.
         data (pd.DataFrame): The input features.
@@ -45,7 +45,7 @@ def __init__(
         self,
         alphas: AlphaLike,
         data: XdataLike,
-        label: Optional[YdataLike] = None,
+        label: YdataLike | None = None,
         model: str = ModelName.lightgbm.value,
     ) -> None:
         """Initialize the MQDataset."""
@@ -66,94 +66,54 @@ def __init__(
 
     @property
     def train_dtype(self) -> Callable:
-        """
-        Get the data type function for training data.
-        Returns:
-            Callable: The function that converts data to the required training data type.
-        """
+        """Get the data type function for training data."""
         return self._train_dtype
 
     @property
     def predict_dtype(self) -> Callable:
-        """
-        Get the data type function for prediction data.
-        Returns:
-            Callable: The function that converts data to the required prediction data type.
-        """
+        """Get the data type function for prediction data."""
         return self._predict_dtype
 
     @property
     def model(self) -> ModelName:
-        """
-        Get the model type.
-        Returns:
-            ModelName: The model type (LightGBM or XGBoost).
-        """
+        """Get the model type."""
         return self._model
 
     @property
     def columns(self) -> pd.Index:
-        """
-        Get the column names of the input features.
-        Returns:
-            pd.Index: The column names.
-        """
+        """Get the column names of the input features."""
         return self._columns
 
     @property
     def nrow(self) -> int:
-        """
-        Get the number of rows in the dataset.
-        Returns:
-            int: The number of rows.
-        """
+        """Get the number of rows in the dataset."""
         return self._nrow
 
     @property
     def data(self) -> pd.DataFrame:
-        """
-        Get the raw input features.
-        Returns:
-            pd.DataFrame: The input features.
-        """
+        """Get the raw input features."""
         return self._data
 
     @property
     def label(self) -> pd.DataFrame:
-        """
-        Get the raw target labels.
-        Returns:
-            pd.DataFrame: The target labels.
-        """
+        """Get the raw target labels."""
         self.__label_available()
         return self._label
 
     @property
-    def alphas(self) -> List[float]:
-        """
-        Get the list of quantile levels.
-        Returns:
-            List[float]: The quantile levels.
-        """
+    def alphas(self) -> list[float]:
+        """Get the list of quantile levels."""
         return self._alphas
 
     @property
     def dtrain(self) -> DtrainLike:
-        """
-        Get the training data in the required format for the model.
-        Returns:
-            DtrainLike: The training data.
-        """
+        """Get the training data in the required format for the model."""
         self.__label_available()
         return self._train_dtype(data=self._data, label=self._label)
 
     @property
-    def dpredict(self) -> Union[DtrainLike, Callable]:
-        """
-        Get the prediction data in the required format for the model.
-        Returns:
-            Union[DtrainLike, Callable]: The prediction data.
-        """
+    def dpredict(self) -> DtrainLike | Callable:
+        """Get the prediction data in the required format for the model."""
         return self._predict_dtype(data=self._data)
 
     def __label_available(self) -> None: