fix : 修复策略相关文件的类型注解与抽象方法体

- 修复 strategy.py 单元素 Union 与缺失的参数/返回类型注解
- 修复 train_context.py 8 个 default=None 字段缺 Optional 标记
- 修复 sample.py/packing.py/position_id.py 方法缺参数及返回类型注解
- 修复 factory.py _resolve_type/list_registered 缺类型注解
- 修复 train_config.py 裸 dict/list 缺泛型参数
- abstractmethod body 从 ... 改为 raise NotImplementedError
- feat : checkpoint meta.json 保存 TrainConfig 超参供人工查阅

astrai/preprocessing/position_id.py

@@ -16,7 +16,8 @@ class PositionIdStrategy(ABC):
     """Generate ``position_ids`` for packed sequences."""
 
     @abstractmethod
-    def generate(self, sequences: List[list]) -> List[int]: ...
+    def generate(self, sequences: List[List[int]]) -> List[int]:
+        raise NotImplementedError
 
 
 class PositionIdStrategyFactory(BaseFactory["PositionIdStrategy"]):
@@ -25,13 +26,13 @@ class PositionIdStrategyFactory(BaseFactory["PositionIdStrategy"]):
 
 @PositionIdStrategyFactory.register("none")
 class NoPositionId(PositionIdStrategy):
-    def generate(self, sequences):
+    def generate(self, sequences: List[List[int]]) -> List[int]:
         return []
 
 
 @PositionIdStrategyFactory.register("doc_reset")
 class DocResetPositionId(PositionIdStrategy):
-    def generate(self, sequences):
+    def generate(self, sequences: List[List[int]]) -> List[int]:
         pos_ids = []
         for seq in sequences:
             pos_ids.extend(range(len(seq)))
@@ -40,6 +41,6 @@ class DocResetPositionId(PositionIdStrategy):
 
 @PositionIdStrategyFactory.register("continuous")
 class ContinuousPositionId(PositionIdStrategy):
-    def generate(self, sequences):
+    def generate(self, sequences: List[List[int]]) -> List[int]:
         total = sum(len(seq) for seq in sequences)
         return list(range(total))