fix mobilnetv1 1p error: device_id not defined

model_zoo/official/cv/mobilenetv1/train.py

@@ -61,9 +61,9 @@ if __name__ == '__main__':
     context.set_context(mode=context.GRAPH_MODE, device_target=target, save_graphs=False)
     if args_opt.parameter_server:
         context.set_ps_context(enable_ps=True)
+    device_id = int(os.getenv('DEVICE_ID'), '0')
     if args_opt.run_distribute:
         if target == "Ascend":
-            device_id = int(os.getenv('DEVICE_ID'))
             context.set_context(device_id=device_id, enable_auto_mixed_precision=True)
             context.set_auto_parallel_context(device_num=args_opt.device_num, parallel_mode=ParallelMode.DATA_PARALLEL,
                                               gradients_mean=True)