add chroma reset

app.py

@@ -194,7 +194,7 @@ def load_documents(file_path: str, mode: str = "elements"):
   
 def initialize_chroma(collection_name: str, embedding_function: MyEmbeddingFunction):  
     client = chromadb.HttpClient(host='localhost', port=8000) 
-    # client.reset()  # resets the database   
+    client.reset()  # resets the database   
     collection = client.create_collection(collection_name)  
     return client, collection