Extra sumo-gui pop-ups in visualizer

[cathywu]

Feature Description

Currently, visualizing a policy (via flow/visualize/visualizer_rllib.py) with flow+rllib creates several (3?) extraneous instances of sumo-gui before the one that will actually play the policy. This is counter-intuitive to new users, and could cause them to believe that the visualizer is not working. Can we either avoid these instances or make clear in the documentation and/or the visualization script output that this is expected behavior?

cc @persimmon2014 in case there are more details I missed.

[kjang96]

+111

[eugenevinitsky]

Yeah, I hate this and have hated this for over two years now. Going to prioritize resolving this.

[Antonio-Dominguez]

Hi, have you already solved this or do you know how to do it?
I need that every time that I run a simulation Flow creates a single Sumo instance, but it creates 2 per simulation instead.

This is a problem since I am using a second TraCi client externally and I want to fix the port in which Sumo is listening, but I get an error every time the second instance is created since the first one is already listening in the fixed port.

Any idea?

Thank you