diff --git a/ultralytics/__init__.py b/ultralytics/__init__.py
index 846f8c3f..e79ad3ed 100644
--- a/ultralytics/__init__.py
+++ b/ultralytics/__init__.py
@@ -1,6 +1,6 @@
 # Ultralytics YOLO 🚀, AGPL-3.0 license
 
-__version__ = "8.1.27"
+__version__ = "8.1.28"
 
 from ultralytics.data.explorer.explorer import Explorer
 from ultralytics.models import RTDETR, SAM, YOLO, YOLOWorld
diff --git a/ultralytics/models/rtdetr/model.py b/ultralytics/models/rtdetr/model.py
index 68d43be7..440df179 100644
--- a/ultralytics/models/rtdetr/model.py
+++ b/ultralytics/models/rtdetr/model.py
@@ -7,8 +7,6 @@ hybrid encoder and IoU-aware query selection for enhanced detection accuracy.
 For more information on RT-DETR, visit: https://arxiv.org/pdf/2304.08069.pdf
 """
 
-from pathlib import Path
-
 from ultralytics.engine.model import Model
 from ultralytics.nn.tasks import RTDETRDetectionModel
 
diff --git a/ultralytics/nn/modules/head.py b/ultralytics/nn/modules/head.py
index b8fa5fd0..9cd794e4 100644
--- a/ultralytics/nn/modules/head.py
+++ b/ultralytics/nn/modules/head.py
@@ -395,7 +395,7 @@ class RTDETRDecoder(nn.Module):
             anchors.append(torch.cat([grid_xy, wh], -1).view(-1, h * w, 4))  # (1, h*w, 4)
 
         anchors = torch.cat(anchors, 1)  # (1, h*w*nl, 4)
-        valid_mask = ((anchors > eps) * (anchors < 1 - eps)).all(-1, keepdim=True)  # 1, h*w*nl, 1
+        valid_mask = ((anchors > eps) & (anchors < 1 - eps)).all(-1, keepdim=True)  # 1, h*w*nl, 1
         anchors = torch.log(anchors / (1 - anchors))
         anchors = anchors.masked_fill(~valid_mask, float("inf"))
         return anchors, valid_mask