Jakob, Please see the attached for the input files of the two experiments.
I greatly appreciate your help. Please let me know if there's anything else I can provide. Thanks! ________________________________ From: sumo-user <[email protected]> on behalf of Jakob Erdmann <[email protected]> Sent: Wednesday, May 26, 2021 4:32 AM To: Sumo project User discussions <[email protected]> Subject: Re: [sumo-user] Using vTypeDistribution Please provide input files for both experiments. Am Mi., 26. Mai 2021 um 08:51 Uhr schrieb Bae, Jong In <[email protected]<mailto:[email protected]>>: Thanks Jakob for pointing out the error. I added the flows that use my vTypeDistribution. Also, I put both vehicle types under one vTypeDistribution as you suggested in the earlier email. My new rou.file screenshot is attached. However, I'm still seeing some differences (# of vehicles processed as well as average travel time of a particular vehicle group) between the experiment runs. Would there be anything else in my rou.file that may be creating the difference? The only thing I'm changing between the experiments is the proportion of the vehicle type in each direction (thru and exit) while keeping the total volume the same. Since the two vehicle types have identical properties, I'm expecting to see the same results across the experiments. Any suggestion would be greatly appreciated! ________________________________ From: sumo-user <[email protected]<mailto:[email protected]>> on behalf of Jakob Erdmann <[email protected]<mailto:[email protected]>> Sent: Tuesday, May 25, 2021 4:22 AM To: Sumo project User discussions <[email protected]<mailto:[email protected]>> Subject: Re: [sumo-user] Using vTypeDistribution Your input is lacking any <vehicle>, <flow> or <trip> defintions that use your vTypeDistribution. Am Fr., 21. Mai 2021 um 16:30 Uhr schrieb Bae, Jong In <[email protected]<mailto:[email protected]>>: Thank you Jakob for your suggestion! I have changed my rou.file so that I'm putting all vehicle types into one distribution as shown in the attached screenshot. However, it seems like the way I have set up my rou.file may be incorrect. My files are loaded into simulation successfully but the simulation doesn't run (simulation ends at -0.10). Since it's not returning any error message, I'm unable to figure out what the issue is. I attached a screenshot of the rou.file as well as the zipped files of my experiment. I would appreciate any guidance you can provide. Thank you. ________________________________ From: sumo-user <[email protected]<mailto:[email protected]>> on behalf of Jakob Erdmann <[email protected]<mailto:[email protected]>> Sent: Friday, May 21, 2021 6:47 AM To: Sumo project User discussions <[email protected]<mailto:[email protected]>> Subject: Re: [sumo-user] Using vTypeDistribution If you keep the number of vTypeDistributions constant, the number of random calls should be constant as well regardless of how many vehicles are sampled from each distribution. A common way to use them is to put all types into one distribution and them sample each vehicle type from that distribution. Random depart offset and vTypeDistributions use the same RNG so you won't get any advantage by using the former without fixing the latter. Am Fr., 21. Mai 2021 um 10:58 Uhr schrieb Bae, Jong In <[email protected]<mailto:[email protected]>>: Thank you for your explanation. Does this mean that every time a vehicle is deployed from one of the vTypeDistribution (each distribution only has one vehicle type in my set up), the random number generator's state changes? And if the number of vehicles change in each vTypeDistribution in the next experiment while maintaining the same lane volume (all vehicles have identical properties), the roadway condition still changes due to the randomness from the vTypeDistribution. Is this the correct way of understanding the issue? If I am trying to create an identical roadway conditions while changing the composition of vehicle types (all of them have identical properties), should I use flow instead of vTypeDistribution? According to the SUMO documentation, I can use --randomize-flows option to add randomness. Instead of using this option, can I use the seed value and the random-depart-offset value (defined in the .sumocfg file) to have the vehicle depart time the same? Thank you so much! ________________________________ From: sumo-user <[email protected]<mailto:[email protected]>> on behalf of Jakob Erdmann <[email protected]<mailto:[email protected]>> Sent: Thursday, May 20, 2021 9:12 AM To: Sumo project User discussions <[email protected]<mailto:[email protected]>> Subject: Re: [sumo-user] Using vTypeDistribution Whenever a type is sampled from a distribution, the state of one of the random number generators changes. This can have far-reaching effects on other parts of the simulation that use the same random number generator (i.e. speedFactor distribution). Am Do., 20. Mai 2021 um 14:08 Uhr schrieb Bae, Jong In <[email protected]<mailto:[email protected]>>: Hello, I have some questions about how using vTypeDistribution may introduce randomness in simulation even if the seed value and the random-depart-offset value were kept the same. My experiment is a 2-lane highway. "HVexit" vehicles merge into lane 0 to exit the highway. The attached screenshot shows the vTypeDistributions in my experiment. The two vehicle types (AV and HV) have the identical properties. Thus, they should behave identically. In my next experiment, my "HVexit" volume was kept the same and all the other volumes changed. However, the volume changes were made in a way that the total volume of each approach (thru and exit) as well as the total lane volume were kept the same. In other words, the road conditions (lane volumes) were kept the same - it's just the vehicle compositions changed but the two vehicle types behave identically. I would expect that these two experiments would have the exact same results. The seed value and the random-depart-offset value were kept the same. However, the number of vehicles processed (completed their routes) and the average travel time of "HVexit" were slightly different. I was wondering if using multiple vTypeDistirbution introduced randomness in the simulation. I know my question was lengthy. Please let me know if I can clarify my question in any way. Thank you so much in advance for your help! _______________________________________________ sumo-user mailing list [email protected]<mailto:[email protected]> To unsubscribe from this list, visit https://www.eclipse.org/mailman/listinfo/sumo-user _______________________________________________ sumo-user mailing list [email protected]<mailto:[email protected]> To unsubscribe from this list, visit https://www.eclipse.org/mailman/listinfo/sumo-user _______________________________________________ sumo-user mailing list [email protected]<mailto:[email protected]> To unsubscribe from this list, visit https://www.eclipse.org/mailman/listinfo/sumo-user _______________________________________________ sumo-user mailing list [email protected]<mailto:[email protected]> To unsubscribe from this list, visit https://www.eclipse.org/mailman/listinfo/sumo-user
<<attachment: sample_scenario.zip>>
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