set graph model should befor init(), otherwise hccl will report repeat init error.

model_zoo/official/cv/vgg16/train.py

@@ -126,6 +126,7 @@ def merge_args(args_opt, cloud_args):
 if __name__ == '__main__':
     args = parse_args()
 
+    context.set_context(mode=context.GRAPH_MODE, device_target=args.device_target)
     device_num = int(os.environ.get("DEVICE_NUM", 1))
     if args.is_distributed:
         if args.device_target == "Ascend":
@@ -143,7 +144,6 @@ if __name__ == '__main__':
     else:
         if args.device_target == "Ascend":
             context.set_context(device_id=args.device_id)
-    context.set_context(mode=context.GRAPH_MODE, device_target=args.device_target)
 
     # select for master rank save ckpt or all rank save, compatible for model parallel
     args.rank_save_ckpt_flag = 0