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运行python3 rknn_transfer.py报错如下( python3==3.6.9 , tensorflow==1.14.0, keras==2.2.5), 帮忙看下什么原因

W:tensorflow:From /home/xx/workspace/venv/lib/python3.6/site-packages/keras/backend/tensorflow_backend.py:66: The name tf.get_default_graph is deprecated. Please use tf.compat.v1.get_default_graph instead.

Traceback (most recent call last):
  File "rknn_transfer.py", line 124, in <module>
    pb_transfer()
  File "rknn_transfer.py", line 55, in pb_transfer
    net_model = load_model(weight_file_path)
  File "/home/xx/workspace/venv/lib/python3.6/site-packages/keras/engine/saving.py", line 458, in load_wrapper
    return load_function(*args, **kwargs)
  File "/home/xx/workspace/venv/lib/python3.6/site-packages/keras/engine/saving.py", line 550, in load_model
    model = _deserialize_model(h5dict, custom_objects, compile)
  File "/home/xx/workspace/venv/lib/python3.6/site-packages/keras/engine/saving.py", line 242, in _deserialize_model
    model_config = json.loads(model_config.decode('utf-8'))
AttributeError: 'str' object has no attribute 'decode'