debut separation front/back

frontend/pages/normalization.py

@@ -1,4 +1,7 @@
 import streamlit as st
+import sys
+import os
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '../../backend')))
 from normstrategy import MVStrategy, ScalingStrategy, KNNStrategy
 
 if "data" in st.session_state:
@@ -32,4 +35,4 @@ if "data" in st.session_state:
     st.write(data)
     st.session_state.data = data
 else:
-    st.error("file not loaded")
+    st.error("file not loaded")