Not getting proper output while running 'detection' demo of ChainerCV

Question

I am trying to run a 'detection' demo of ChainerCV from here, https://github.com/chainer/chainercv/tree/master/examples/detection

I am running this demo in BitFusion Ubuntu 14.04 Chainer AMI on AWS with a p2.xlarge instance which uses a single GPU.

When I try to run this demo at first I am getting this error,

no display name and no $DISPLAY environment variable

So I researched it on the web and get a solution for using matplotlib with AGG engine, so I tried to import that and use agg. That does solve the problem of $DISPLAY but now when I run the demo it gets executed successfully but as an output, all I get is a white blank image.

Can anyone tell me the reason behind this?

Answer 1

The problem seems that you run the demo program in remote machine and X is not properly set. You can get proper matplotlib output when you connect to your remote machine with ssh -X <your.remote.machine.address>, but it will takes time to show the resultt.

If you want to run demo in remote machine quickly, i recommend you to set MPLBACKEND=Agg, save plot figure as image by plt.savefig(<imagepath>) and do not run plt.show() in demo program.