Function compute_3d_matches

Finds matches between prediction and ground truth instances. Returns: gt_matches: 2-D array. For each GT box it has the index of the matched predicted box. pred_matches: 2-D array. For each predicted box, it has the index of the matched groun

(gt_class_ids, gt_RTs, gt_scales, gt_handle_visibility, synset_names,
                       pred_boxes, pred_class_ids, pred_scores, pred_RTs, pred_scales,
                       iou_3d_thresholds, score_threshold=0)