add arg label_smooth

fluid/PaddleCV/yolov3/models.py

@@ -210,6 +210,7 @@ class YOLOv3(object):
                             class_num=class_num,
                             ignore_thresh=ignore_thresh,
                             downsample=self.downsample,
+                            use_label_smooth=cfg.label_smooth,
                             name="yolo_loss"+str(i))
                     self.losses.append(fluid.layers.reduce_mean(loss))
                     self.downsample //= 2

fluid/PaddleCV/yolov3/utility.py

@@ -112,7 +112,8 @@ def parse_args():
     add_arg('log_window',       int,    20,        "Log smooth window, set 1 for debug, set 20 for train.")
     # TRAIN TEST INFER
     add_arg('input_size',       int,    608,    "Image input size of YOLOv3.")
-    add_arg('random_shape',     bool,   False,     "Resize to random shape for train reader")
+    add_arg('random_shape',     bool,   True,     "Resize to random shape for train reader.")
+    add_arg('label_smooth',     bool,   True,     "Use label smooth in class label.")
     add_arg('no_mixup_iter',    int,    40000,      "Disable mixup in last N iter.")
     add_arg('valid_thresh',     float,  0.01,    "Valid confidence score for NMS.")
     add_arg('nms_thresh',       float,  0.45,    "NMS threshold.")