Update app.py

app.py

@@ -29,7 +29,18 @@ from langchain.retrievers.document_compressors import CrossEncoderReranker
 from langchain_community.cross_encoders import HuggingFaceCrossEncoder
 from langchain.prompts import ChatPromptTemplate
 
+import os
+from sentence_transformers import SentenceTransformer
+
+MODEL_DIR = "models/all-MiniLM-L6-v2"
 
+if not os.path.exists(MODEL_DIR):
+    print("📦 Downloading SentenceTransformer model...")
+    model = SentenceTransformer("all-MiniLM-L6-v2")
+    model.save(MODEL_DIR)
+    print("✅ Model saved at", MODEL_DIR)
+
+    
 # Load environment variables
 load_dotenv()