我使用python测试更快的rcnn demo.py与windows cpu没有cuda.In demo.py，最后有一个plt.show（），但是当我运行demo.py时，它没有显示任何pictures.please见如下：
I0302 21:17:53.209992 1168 net.cpp:774] Copying source layer drop7
I0302 21:17:53.209992 1168 net.cpp:771] Ignoring source layer fc8
I0302 21:17:53.209992 1168 net.cpp:771] Ignoring source layer prob
Loaded network C:\Users\shihaohou\Desktop\py-faster-rcnn- master\data\faster_rcnn_models\ZF_faster_rcnn_final.caffemodel
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Demo for data/demo/000456.jpg
Detection took 3.637s for 300 object proposals
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Demo for data/demo/000542.jpg
Detection took 3.580s for 300 object proposals