>>> plt.show()
__main__:1: UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure.
原因：
发现发生在 coco.py 文件
处理办法：
import matplotlib
>>> matplotlib.get_backend()
'agg'
>>> matplotlib.use('TkAgg')
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matplotlib之__main__:1: UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure.
【debug】Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure.
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