diff --git a/dygraph/configs/solov2/solov2_r50_fpn_1x_coco.yml b/dygraph/configs/solov2/solov2_r50_fpn_1x_coco.yml
index f2c15c10b6a36cbb25514b8c01925ab253e0e3df..e5f548d53a80937be526f9c927fa8f6cdb6e7e9c 100644
--- a/dygraph/configs/solov2/solov2_r50_fpn_1x_coco.yml
+++ b/dygraph/configs/solov2/solov2_r50_fpn_1x_coco.yml
@@ -1,6 +1,6 @@
 _BASE_: [
-  '../_base_/datasets/coco_instance.yml',
-  '../_base_/runtime.yml',
+  '../datasets/coco_instance.yml',
+  '../runtime.yml',
   '_base_/solov2_r50_fpn.yml',
   '_base_/optimizer_1x.yml',
   '_base_/solov2_reader.yml',
diff --git a/dygraph/configs/solov2/solov2_r50_fpn_3x_coco.yml b/dygraph/configs/solov2/solov2_r50_fpn_3x_coco.yml
index f0ac682ac8b9728291d4dbeb5ac3d25d44e48e8e..abda7711cc6b907689644552f602e94fb358ec59 100644
--- a/dygraph/configs/solov2/solov2_r50_fpn_3x_coco.yml
+++ b/dygraph/configs/solov2/solov2_r50_fpn_3x_coco.yml
@@ -1,6 +1,6 @@
 _BASE_: [
-  '../_base_/datasets/coco_instance.yml',
-  '../_base_/runtime.yml',
+  '../datasets/coco_instance.yml',
+  '../runtime.yml',
   '_base_/solov2_r50_fpn.yml',
   '_base_/optimizer_1x.yml',
   '_base_/solov2_reader.yml',
diff --git a/dygraph/ppdet/modeling/layers.py b/dygraph/ppdet/modeling/layers.py
index 478d7c14e87d36cb5b23159befdc67f742bf9668..7537a0a0458001059cceb03a5d64d38491f6644f 100644
--- a/dygraph/ppdet/modeling/layers.py
+++ b/dygraph/ppdet/modeling/layers.py
@@ -900,6 +900,8 @@ class FCOSBox(object):
         return pred_boxes, pred_scores
 
 
+@register
+@serializable
 class MaskMatrixNMS(object):
     """
     Matrix NMS for multi-class masks.