Minor refactorings

To make pylint happy

net/utilities.py

@@ -542,10 +542,7 @@ def get_detections_after_soft_non_maximum_suppression(detections, sigma, score_t
         max_x = np.minimum(detections[0, 2], detections[1:, 2])
         max_y = np.minimum(detections[0, 3], detections[1:, 3])
 
-        overlap_width = np.maximum(max_x - min_x + 1, 0.0)
-        overlap_height = np.maximum(max_y - min_y + 1, 0.0)
-
-        intersection_area = overlap_width * overlap_height
+        intersection_area = np.maximum(max_x - min_x + 1, 0.0) * np.maximum(max_y - min_y + 1, 0.0)
         intersection_over_union = \
             intersection_area / (detections[0, areas_index] + detections[1:, areas_index] - intersection_area)