update mobilenetv3.py (#405)

dygraph/configs/deeplabv3p/deeplabv3p_mobilenetv3_large_cityscapes_769x769_160k.yml

 _base_: '../_base_/cityscapes.yml'
 
+iters: 160000
+
 model:
   type: DeepLabV3
   backbone:

dygraph/configs/deeplabv3p/deeplabv3p_xception65_cityscapes_769x769_160k.yml

 _base_: '../_base_/cityscapes.yml'
 
+iters: 160000
+
 model:
   type: DeepLabV3
   backbone:

dygraph/paddleseg/models/backbones/mobilenetv3.py

@@ -25,7 +25,8 @@ import paddle.nn as nn
 import paddle.nn.functional as F
 from paddle.nn import Conv2d, AdaptiveAvgPool2d
 from paddle.nn import SyncBatchNorm as BatchNorm
-from paddle.regularizer import L2Decay
+# from paddle.regularizer import L2Decay
+from paddle.fluid.regularizer import L2Decay
 from paddle import ParamAttr
 
 from paddleseg.models.common import layer_libs, activation