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Re: [sumo-user] question about the --seed parameter
The python tool createVehTypeDistribution.py uses a single random number generated. For this reason, changes to some parameters also affect the values for other parameters.
Determinism is only guaranteed insofar the exact same inputs will result in the exact same results when using the same seed.

If you could provide the exact input files that make sumo crash, I'd be happy to investigate (crashes are not supposed to happen).

regards,
Jakob


2018-09-12 17:13 GMT+02:00 <christian.damdjowabo@xxxxxx>:

Hello Jakob, hello everybody,

 

I have a question about the generation distribution using “createVehTypeDistribution.py” or also by generation the road using “duarouter”.

My question is that I don’t know why by changing just one parameter (as example the parameter “mean impatience”) and keep another parameter constant.

The generated value isn’t constant, although I use a constant value of “--seed” (--seed=1) as you can see in the command line that I used.

 

To be able to explain you exactly the problem that I facing now, I sent you some files which contain the “typ1.txt” and “typ2.txt”.

I generated the first time “vTypeDistributions1.add.xml” and “vTypeDistributions2.add.xml”. In this first generation the mean value of parameter “impatience” is equal to 0.

And then I changed in the second generation that value to “1” and the other parameters are always kept constant.

Unfortunately I got in the “vTypeDistributions1.add.xml” and “vTypeDistributions2.add.xml” a change in all parameter. Also the parameter, which was kept constant in the Input File “typ1.txt” and “typ2.txt”.

Can you help me to know, what I’m doing wrong. Because I through that by setting the parameter --seed = constant, it would be possible to have a deterministic choice of random parameter. I don’t know why it’s not the case by using “createVehTypeDistribution.py”.

 

I also remark that for some value of --seed sumo crashes. It’s why I want to know, how we have to choice that value?

 

 

 

--------------------- Part of the code below--------------------------------------------------------------------------------------------------|

 

commandStr1 = 'python D:\criticality_pyth\createVehTypeDistribution.py D:\criticality_pyth\typ1.txt --output-file=D:\criticality_pyth\vTypeDistributions1.add.xml --name=vehDist1 --size=1000 --seed=1';

 

commandStr2 = 'python D:\criticality_pyth\createVehTypeDistribution.py D:\criticality_pyth\typ2.txt --output-file=D:\criticality_pyth\vTypeDistributions2.add.xml --name=vehDist2 --size=1000 --seed=1';

 

commandStr3 = 'python D:\criticality_pyth\randomTrips.py --seed=1 --weights-prefix=D:\criticality_pyth\example.src.xml --prefix=pa --period=3 --net-file=D:\criticality_pyth\Campus_test.net.xml --route-file=D:\criticality_pyth\campus_test_passenger.rou.xml --trip-attributes="type=\"vehDist1\"" --additional-file=D:\criticality_pyth\vTypeDistributions1.add.xml';

 

commandStr4 = 'duarouter D:\criticality_pyth\flows2routes.duarcfg --seed=1';

 

Br

 

Christian

 


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