Update app.py

app.py

@@ -41,7 +41,7 @@ collection_name = "paper"
 upload_dir = "uploaded_files"
 if not os.path.exists(upload_dir):
     os.makedirs(upload_dir)
-# We no longer clear the folder so previously uploaded files are retained.
+# We do not clear the folder to keep previously uploaded files.
 
 # -------------------------------------------------------
 # Function to process uploaded files and update the index.
@@ -81,10 +81,12 @@ def process_upload(files):
     if collection_name not in existing_collections:
         client.create_collection(
             collection_name=collection_name,
-            vectors_config=models.VectorParams(
-                size=1536,  # text-embedding-ada-002 produces 1536-dimensional vectors.
-                distance=models.Distance.COSINE
-            )
+            vectors_config={
+                "text-dense": models.VectorParams(
+                    size=1536,  # text-embedding-ada-002 produces 1536-dimensional vectors.
+                    distance=models.Distance.COSINE
+                )
+            }
         )
         # Wait briefly for the collection creation to complete.
         time.sleep(1)
@@ -101,6 +103,7 @@ def process_upload(files):
     
     # Build the index if it doesn't exist; otherwise, update it.
     if index is None:
+        # Load all documents from the persistent folder.
         index = VectorStoreIndex.from_documents(
             SimpleDirectoryReader(upload_dir).load_data(),
             storage_context=storage_context