change FAISS datasets download method

app.py

@@ -5,6 +5,7 @@ from transformers import AutoModelForCausalLM, AutoTokenizer, TextIteratorStream
 from threading import Thread
 from langchain_community.vectorstores.faiss import FAISS
 from langchain_huggingface import HuggingFaceEmbeddings
+from huggingface_hub import snapshot_download
 
 class RAGChatbot:
     def __init__(self):
@@ -91,9 +92,16 @@ class RAGChatbot:
     def init_vector_store(self):
         """Load vector store from HuggingFace Hub"""
         try:
-            self.vector_store = FAISS.from_huggingface_hub(
+            # Download FAISS files from HuggingFace Hub
+            repo_path = snapshot_download(
                 repo_id="StevenChen16/laws.faiss",
-                embeddings=self.embeddings,
+                repo_type="model"
+            )
+            
+            # Load the vector store from downloaded files
+            self.vector_store = FAISS.load_local(
+                repo_path,
+                self.embeddings,
                 allow_dangerous_deserialization=True
             )
         except Exception as e: