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reranker/base.py

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+from abc import ABC, abstractmethod
+from typing import List, Dict, Any
+
+class BaseReranker(ABC):
+    """Abstract base class for all rerankers."""
+    
+    @abstractmethod
+    def rerank(self, query: str, documents: List[Dict[str, Any]], top_k: int = None) -> List[Dict[str, Any]]:
+        """
+        Rerank documents based on relevance to the query.
+        
+        Args:
+            query: The search query
+            documents: List of documents to rerank, each with 'memory' field  
+            top_k: Number of top documents to return (None = return all)
+            
+        Returns:
+            List of reranked documents with added 'rerank_score' field
+        """
+        pass