问题背景：提示错误如下

 File "D:\InstallFolder\Anaconda3\envs\yolov3\lib\site-packages\keras\engine\saving.py", line 1004, in load_weights_from_hdf5_group
    original_keras_version = f.attrs['keras_version'].decode('utf8')
AttributeError: 'str' object has no attribute 'decode

解决办法：

卸载原来的h5py模块，安装2.10版本

pip install h5py==2.10 -i https://pypi.tuna.tsinghua.edu.cn/simple/