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Re: [sumo-user] Dynamic Traffic Assignment - Convergence Measurement - duaiterate.py
Hello,

duaiterate.py uses a fixed number of iterations by default.
It supports iteration-until-convergence by computing the relative standard deviation of average travel times and aborts when this value is below a given threshold
(each iteration computes the average travel time for all vehicles, the deviation of these averages over the iterations is checked)
If you activate this (as described at https://sumo.dlr.de/docs/Demand/Dynamic_User_Assignment.html#termination) you should also get some output on the current deviation.

There was a recent discussion on System Optimal Traffic Assignment on this list:
http://sumo-user-mailing-list.90755.n8.nabble.com/sumo-user-Traffic-Assignment-td3044.html
There are currently no plans to add System Optimum code but contributions are welcome.

regards,
Jakob

Am Fr., 8. Mai 2020 um 05:05 Uhr schrieb Sadullah Goncu <sadullahgoncu@xxxxxxxxx>:
Greetings,

I am doing some research on the Dynamic Traffic Assignment (DTA) and trying
to use Sumo's DTA components on my test network. I am succesfully using the
duaiterate.py or one-shot.py scripts and getting results. But I have couple
of  questions about duaiterate.py :

What convergence measure does it use to calculate the User Equilibrium (UE)
? Literature has many measurements like Relative Gap, Volume/Capacity
ratios, Measure of Successive Averages (MSA) ...

But I wonder which measurement does SUMO use? I've checked the code of
duaiterate.py but cant find any calculations about this. Website
documentation about duaiterate.py or DTA does not specify which method it is
used as well. If Sumo uses any of these measurements does it give an output
about it ? So we can understand how close it is to an Equilibrium State.

My other question is, is there any System Optimal Dynamic Traffic Assigment
script for Sumo ? As far as I can tell from the documentation there isnt.
But maybe there is a plan in the future ?

I thought this would be a good platform to ask about this matters.

Thank you for your time.
Best Regards
Sadullah.



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