add mean of abs error

box-metrics.py

@@ -195,6 +195,8 @@ class box_metrics(evaluate.Metric):
                                     "bep": np.mean(beps),
                                     "e_bottom_x_mean": np.mean(e_bottom_x),
                                     "e_bottom_y_mean": np.mean(e_bottom_y),
+                                    "e_abs_bottom_x_mean": np.mean(np.abs(e_bottom_x)),
+                                    "e_abs_bottom_y_mean": np.mean(np.abs(e_bottom_y)),
                                     "e_width_mean": np.mean(e_widths),
                                     "e_height_mean": np.mean(e_heights),
                                     "e_n_bottom_x_mean": np.mean(e_n_bottom_x),