[Fix] fix kitti evaluation bugs on test dataset (#2005)

* fix kitti test evaluation bugs

* update

mmdet3d/datasets/kitti_dataset.py

@@ -113,7 +113,7 @@ class KittiDataset(Det3DDataset):
 
             info['plane'] = plane_lidar
 
-        if self.task == 'mono_det':
+        if self.task == 'mono_det' and self.load_eval_anns:
             info['instances'] = info['cam_instances'][self.default_cam_key]
 
         info = super().parse_data_info(info)

mmdet3d/evaluation/metrics/kitti_metric.py

@@ -36,6 +36,10 @@ class KittiMetric(BaseMetric):
             If not specified, a temp file will be created. Default: None.
         default_cam_key (str, optional): The default camera for lidar to
             camear conversion. By default, KITTI: CAM2, Waymo: CAM_FRONT
+        format_only (bool): Format the output results without perform
+            evaluation. It is useful when you want to format the result
+            to a specific format and submit it to the test server.
+            Defaults to False.
         submission_prefix (str, optional): The prefix of submission data.
             If not specified, the submission data will not be generated.
             Default: None.
@@ -52,6 +56,7 @@ class KittiMetric(BaseMetric):
                  prefix: Optional[str] = None,
                  pklfile_prefix: str = None,
                  default_cam_key: str = 'CAM2',
+                 format_only: bool = False,
                  submission_prefix: str = None,
                  collect_device: str = 'cpu',
                  file_client_args: dict = dict(backend='disk')):
@@ -61,6 +66,13 @@ class KittiMetric(BaseMetric):
         self.pcd_limit_range = pcd_limit_range
         self.ann_file = ann_file
         self.pklfile_prefix = pklfile_prefix
+        self.format_only = format_only
+        if self.format_only:
+            assert submission_prefix is not None, 'submission_prefix must be'
+            'not None when format_only is True, otherwise the result files'
+            'will be saved to a temp directory which will be cleaned up at'
+            'the end.'
+
         self.submission_prefix = submission_prefix
         self.pred_box_type_3d = pred_box_type_3d
         self.default_cam_key = default_cam_key
@@ -84,8 +96,9 @@ class KittiMetric(BaseMetric):
         Returns:
             List[dict]: List of Kitti annotations.
         """
-        cat2label = data_infos['metainfo']['categories']
         data_annos = data_infos['data_list']
+        if not self.format_only:
+            cat2label = data_infos['metainfo']['categories']
             label2cat = dict((v, k) for (k, v) in cat2label.items())
             assert 'instances' in data_annos[0]
             for i, annos in enumerate(data_annos):
@@ -121,8 +134,10 @@ class KittiMetric(BaseMetric):
                         kitti_annos['alpha'].append(instance['alpha'])
                         kitti_annos['bbox'].append(instance['bbox'])
                         kitti_annos['location'].append(instance['bbox_3d'][:3])
-                    kitti_annos['dimensions'].append(instance['bbox_3d'][3:6])
-                    kitti_annos['rotation_y'].append(instance['bbox_3d'][6])
+                        kitti_annos['dimensions'].append(
+                            instance['bbox_3d'][3:6])
+                        kitti_annos['rotation_y'].append(
+                            instance['bbox_3d'][6])
                         kitti_annos['score'].append(instance['score'])
                     for name in kitti_annos:
                         kitti_annos[name] = np.array(kitti_annos[name])
@@ -178,12 +193,18 @@ class KittiMetric(BaseMetric):
             submission_prefix=self.submission_prefix,
             classes=self.classes)
 
+        metric_dict = {}
+
+        if self.format_only:
+            logger.info('results are saved in '
+                        f'{osp.dirname(self.submission_prefix)}')
+            return metric_dict
+
         gt_annos = [
             self.data_infos[result['sample_idx']]['kitti_annos']
             for result in results
         ]
 
-        metric_dict = {}
         for metric in self.metrics:
             ap_dict = self.kitti_evaluate(
                 result_dict,
@@ -321,7 +342,7 @@ class KittiMetric(BaseMetric):
             mmengine.mkdir_or_exist(submission_prefix)
 
         det_annos = []
-        print('\nConverting prediction to KITTI format')
+        print('\nConverting 3D prediction to KITTI format')
         for idx, pred_dicts in enumerate(
                 mmengine.track_iter_progress(net_outputs)):
             annos = []
@@ -447,7 +468,7 @@ class KittiMetric(BaseMetric):
         assert len(net_outputs) == len(self.data_infos), \
             'invalid list length of network outputs'
         det_annos = []
-        print('\nConverting prediction to KITTI format')
+        print('\nConverting 2D prediction to KITTI format')
         for i, bboxes_per_sample in enumerate(
                 mmengine.track_iter_progress(net_outputs)):
             annos = []
@@ -516,7 +537,7 @@ class KittiMetric(BaseMetric):
             mmengine.mkdir_or_exist(submission_prefix)
             print(f'Saving KITTI submission to {submission_prefix}')
             for i, anno in enumerate(det_annos):
-                sample_idx = self.data_infos[i]['image']['image_idx']
+                sample_idx = sample_id_list[i]
                 cur_det_file = f'{submission_prefix}/{sample_idx:06d}.txt'
                 with open(cur_det_file, 'w') as f:
                     bbox = anno['bbox']