Update app.py

app.py

@@ -3,6 +3,12 @@ import cv2
 import numpy as np
 import mediapipe as mp
 from sklearn.cluster import KMeans
+import os
+
+# Train the model once at startup
+if not os.path.exists("mask_model.pkl"):
+    exec(open("train_model.py").read())
+
 
 # ADD this function near the top
 def recommend_mask_style(face_shape, skin_tone):