Update utils.py

utils.py

@@ -33,6 +33,7 @@ def load_and_preprocess_data():
     # Change customer id to int
     df["User-ID"] = df["User-ID"].astype(int)
     df_users["Age"] = df_users["Age"].astype(int)
+    df_books["Year-Of-Publication"] = df_books["Year-Of-Publication"].astype(int)
 
     # Add price column
     #df["Price"] = df["Quantity"] * df["UnitPrice"]