From ff211f403729fe52d1fbf96fad05f162a6a3cddb Mon Sep 17 00:00:00 2001
From: Laughing <61612323+Laughing-q@users.noreply.github.com>
Date: Mon, 15 May 2023 18:09:34 +0800
Subject: [PATCH] fix loss (#2614)

---
 ultralytics/yolo/utils/loss.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ultralytics/yolo/utils/loss.py b/ultralytics/yolo/utils/loss.py
index 50c3860..73aba68 100644
--- a/ultralytics/yolo/utils/loss.py
+++ b/ultralytics/yolo/utils/loss.py
@@ -34,7 +34,7 @@ class BboxLoss(nn.Module):
 
     def forward(self, pred_dist, pred_bboxes, anchor_points, target_bboxes, target_scores, target_scores_sum, fg_mask):
         """IoU loss."""
-        weight = target_scores.sum(-1)[fg_mask]
+        weight = target_scores.sum(-1)[fg_mask].unsqueeze(-1)
         iou = bbox_iou(pred_bboxes[fg_mask], target_bboxes[fg_mask], xywh=False, CIoU=True)
         loss_iou = ((1.0 - iou) * weight).sum() / target_scores_sum