fix background_label in nms (#2125)

dygraph/configs/fcos/_base_/fcos_r50_fpn.yml

@@ -57,4 +57,3 @@ FCOSPostProcess:
     keep_top_k: 100
     score_threshold: 0.025
     nms_threshold: 0.6
-    background_label: -1

dygraph/configs/ppyolo/_base_/ppyolo_r50vd_dcn.yml

@@ -67,4 +67,3 @@ BBoxPostProcess:
     post_threshold: 0.01
     nms_top_k: -1
     normalized: false
-    background_label: -1

dygraph/configs/yolov3/_base_/yolov3_darknet53.yml

@@ -42,4 +42,3 @@ BBoxPostProcess:
     nms_threshold: 0.45
     nms_top_k: 1000
     normalized: false
-    background_label: -1

dygraph/configs/yolov3/_base_/yolov3_mobilenet_v1.yml

@@ -43,4 +43,3 @@ BBoxPostProcess:
     nms_threshold: 0.45
     nms_top_k: 1000
     normalized: false
-    background_label: -1

dygraph/configs/yolov3/_base_/yolov3_mobilenet_v3_large.yml

@@ -44,4 +44,3 @@ BBoxPostProcess:
     nms_threshold: 0.45
     nms_top_k: 1000
     normalized: false
-    background_label: -1

dygraph/configs/yolov3/_base_/yolov3_mobilenet_v3_small.yml

@@ -44,4 +44,3 @@ BBoxPostProcess:
     nms_threshold: 0.45
     nms_top_k: 1000
     normalized: false
-    background_label: -1

dygraph/ppdet/engine/trainer.py

@@ -54,7 +54,7 @@ class Trainer(object):
         self.model = create(cfg.architecture)
 
         # model slim build
-        if cfg.slim:
+        if 'slim' in cfg and cfg.slim:
             if self.mode == 'train':
                 self.load_weights(cfg.pretrain_weights, cfg.weight_type)
             slim = create(cfg.slim)