diff --git a/tools/cal_results.py b/tools/cal_results.py
index 40898fc..de44fe8 100644
--- a/tools/cal_results.py
+++ b/tools/cal_results.py
@@ -10,13 +10,15 @@ def parse_args():
     parser = argparse.ArgumentParser(
         description='MMDet3D test (and eval) a model')
     parser.add_argument('results_file', help='the results json file')
-    parser.add_argument('anno_file', help='annoations json file')
+    parser.add_argument('ann_file', help='annoations json file')
 
     parser.add_argument('--iou_thr',
                         type=list,
                         default=[0.25, 0.5],
                         help='the IoU threshold during evaluation')
 
+    args = parser.parse_args()
+    return args
 
 def ground_eval(gt_annos, det_annos, iou_thr):
 
@@ -52,10 +54,9 @@ def ground_eval(gt_annos, det_annos, iou_thr):
             hard = gt_anno['is_hard']
             unique = gt_anno['is_unique']
 
-            box_index = scores.argsort(dim=-1, descending=True)[:10]
-            top_bbox = bboxes[box_index]
+            top_bboxes = bboxes[:10]
 
-            iou = top_bbox.overlaps(top_bbox, gt_bboxes)  # (num_query, 1)
+            iou = top_bboxes.overlaps(top_bboxes, gt_bboxes)  # (num_query, 1)
 
             for t in iou_thr:
                 threshold = iou > t