Fix langchain chains and retrievers imports for 0.3.x

project/model/retriever.py

@@ -1,8 +1,8 @@
 from typing import List, Optional
 from langchain_core.documents import Document
 from langchain_community.vectorstores import FAISS
-from langchain.chains.query_constructor.base import AttributeInfo
-from langchain.retrievers.self_query.base import SelfQueryRetriever
+from langchain.chains.query_constructor.schema import AttributeInfo
+from langchain.retrievers import SelfQueryRetriever
 from project.utils.model_loader import ModelLoader
 from project.utils.config_loader import load_config
 from project.logger.logging import get_logger
@@ -91,3 +91,4 @@ class DocumentRetriever:
         
         logger.info(f"Base retriever configured with {search_type} search")
         return self.retriever
+