change BN in bachbones to SyncBN

dygraph/models/architectures/mobilenetv3.py

@@ -21,7 +21,8 @@ import paddle
 import paddle.fluid as fluid
 from paddle.fluid.param_attr import ParamAttr
 from paddle.fluid.layer_helper import LayerHelper
-from paddle.fluid.dygraph.nn import Conv2D, Pool2D, BatchNorm, Linear, Dropout
+from paddle.fluid.dygraph.nn import Conv2D, Pool2D, Linear, Dropout
+from paddle.fluid.dygraph import SyncBatchNorm as BatchNorm
 
 import math
 

dygraph/models/architectures/resnet_vd.py

@@ -24,7 +24,8 @@ import paddle
 import paddle.fluid as fluid
 from paddle.fluid.param_attr import ParamAttr
 from paddle.fluid.layer_helper import LayerHelper
-from paddle.fluid.dygraph.nn import Conv2D, Pool2D, BatchNorm, Linear, Dropout
+from paddle.fluid.dygraph.nn import Conv2D, Pool2D, Linear, Dropout
+from paddle.fluid.dygraph import SyncBatchNorm as BatchNorm
 
 from dygraph.utils import utils
 

dygraph/models/architectures/xception_deeplab.py

@@ -2,7 +2,8 @@ import paddle
 import paddle.fluid as fluid
 from paddle.fluid.param_attr import ParamAttr
 from paddle.fluid.layer_helper import LayerHelper
-from paddle.fluid.dygraph.nn import Conv2D, Pool2D, BatchNorm, Linear, Dropout
+from paddle.fluid.dygraph.nn import Conv2D, Pool2D, Linear, Dropout
+from paddle.fluid.dygraph import SyncBatchNorm as BatchNorm
 
 from dygraph.cvlibs import manager