fixed model training error

utils/rec_models.py

@@ -179,7 +179,7 @@ def evaluate_recommendations(predicted_scores, train_matrix, test_df, user_index
                 true_items.add(item_idx)
                 
                 # Collect actual vs predicted quantities for RMSE/R²
-                actual_quantity = row["Quantity"]
+                actual_quantity = row["score"]
                 predicted_quantity = predicted_scores[user_idx, item_idx]
                 y_true.append(actual_quantity)
                 y_pred.append(predicted_quantity)