I had this problem when I try to run on virtual box: python examples/train.py singleagent_traffic_light_grid. I appreciate your time to help to fix it.
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It looks like you only have 1 CPU available on that machine. Try using the stable baseline examples instead, they can run if only 1 CPU is available.

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Thanks a lot. I had 2 Cpu on this machine, after I increasing the number of Cpus to 3, the command works. – Saeedeh Feb 17 '20 at 01:15