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Re: [sumo-user] vehRoutes output
Thanks for the quick reply. I will disable the meso-overtaking and try again. With respect to the random seed, thanks for the hint. I was initially taking the average of 5 runs, when I noticed the difference. Nevertheless, in the results that I have had so far, I must say random seed had almost no impact. For the original scenario, I always get the orange curve, and for the re-run the blue curve (grey is the empirical Macroscopic Fundamental Diagram). The second diagram shows the impact of random seed in multiple re-run scenarios. I will keep you posted if I find any changes.

Thanks,
Sasan
 image.png

image.png

On Tue, Oct 5, 2021 at 11:29 AM Jakob Erdmann <namdre.sumo@xxxxxxxxx> wrote:
Your simulation is using option --meso-overtaking (which is stochastic) and seems to use a different seed for both runs. This could be sufficient cause for the deviation.
Note, that when using option --random and --seed, option --random takes precedence to generate a random seed (based on system clock) and the given seed is ignored (making the run not reproducible).

Am Di., 5. Okt. 2021 um 09:50 Uhr schrieb Sasan Amini <aminissn@xxxxxxxxx>:
Thanks Jakob. I tried to use --default.speeddev 0 to eliminate the effect of speed deviation, but it actually worsened the situation. The scenario is not that small, but I try to make one that is manageable and send it to you.

Best,
Sasan

On Mon, Oct 4, 2021 at 5:22 PM Jakob Erdmann <namdre.sumo@xxxxxxxxx> wrote:
If your simulation is using vehicle speed deviations (active by default), I recommend that you use the latest development version which supports option
--vehroute-output.speedfactor This reproduces the same vehicle speeds as the original run and should thereby reduce discrepancy.

There are other reasons for the discrepancy (i.e. https://github.com/eclipse/sumo/issues/3024).
If you can provide a small scenario that shows a strong difference between original run and re-run, please send it my way.

regards,
Jakob


Am Mo., 4. Okt. 2021 um 17:15 Uhr schrieb Sasan Amini <aminissn@xxxxxxxxx>:
Dear all,

I am trying to re-create a scenario for which I don't have a calibrated route file, and thus, I use device-rerouting as a Noniterative Stochastic Route Choice method to avoid using duaIterate and time consuming Dynamic User Equilibrium. 
I export the final routes by using --vehroute-output option and provide that as an input to my simulation again. Route lengths are identical, which means the problem is that when I try to re-run the scenario with the newly generated route file, I get fewer cars in my network. What I observe is that almost one-third of my 300,000 cars cannot enter the simulation due to congestion and therefore, I get a totally different traffic situation. I tried options like --vehroute-output.intended-depart, but I still get different departure times. I am running meso-simulation version 1.10.0  and do not change any other parameters of my simulation except for the input route file. Any tips that help me reproduce exactly the same scenario are appreciated.

Thanks,
Sasan

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