!13654 fix fcn8s

From: @wukesong
Reviewed-by: @oacjiewen,@liangchenghui
Signed-off-by: @liangchenghui

model_zoo/official/cv/FCN8s/train.py

@@ -49,6 +49,8 @@ def train():
     context.set_context(mode=context.GRAPH_MODE, enable_auto_mixed_precision=True, save_graphs=False,
                         device_target="Ascend", device_id=args.device_id)
     # init multicards training
+    args.rank = 0
+    args.group_size = 1
     if device_num > 1:
         parallel_mode = ParallelMode.DATA_PARALLEL
         context.set_auto_parallel_context(parallel_mode=parallel_mode, gradients_mean=True, device_num=device_num)