Update pipeline.py

pipeline.py

@@ -1,7 +1,7 @@
 
 import time
 from pathlib import Path
-from typing import List, Any
+from typing import List, Any, Union
 import asyncio # Import asyncio for concurrent operations
 
 from llama_index.core import Document, StorageContext, VectorStoreIndex, Settings
@@ -40,9 +40,9 @@ class Pipeline:
         # Initialize components
         self.documents: List[Document] = []
         self.nodes: List[Any] = []
-        self.storage_context: StorageContext | None = None
-        self.index: VectorStoreIndex | None = None
-        self.retriever: BaseRetriever | None = None
+        self.storage_context: Union[StorageContext, None] = None
+        self.index: Union[VectorStoreIndex, None] = None
+        self.retriever: Union[BaseRetriever, None] = None
         self.leaf_nodes: List[Any] = []
         self.root_nodes: List[Any] = []