update code (#9)

Co-authored-by: xuyang1 <xuyang1@microsoft.com>

rdagent/factor_implementation/share_modules/factor_gen.py

@@ -0,0 +1,31 @@
+from abc import ABC, abstractmethod
+from typing import List
+
+from factor_implementation.share_modules.factor import (
+    FactorImplementation,
+    FactorImplementationTask,
+)
+
+
+class FactorGenerator(ABC):
+    """
+    Because implementing factors will help each other in the process of implementation, we use the interface `List[FactorImplementationTask] -> List[FactorImplementation]` instead of single factor .
+    """
+
+    def __init__(self, target_task_l: List[FactorImplementationTask]) -> None:
+        self.target_task_l = target_task_l
+
+    @abstractmethod
+    def generate(self, *args, **kwargs) -> List[FactorImplementation]:
+        raise NotImplementedError("generate method is not implemented.")
+
+    def collect_feedback(self, feedback_obj_l: List[object]):
+        """
+        When online evaluation.
+        The preivous feedbacks will be collected to support advanced factor generator
+
+        Parameters
+        ----------
+        feedback_obj_l : List[object]
+
+        """