New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Deterministic jet smearing #454

Closed

nsmith- opened this issue Feb 12, 2021 · 0 comments · Fixed by #484

Labels

Member

nsmith- commented Feb 12, 2021 •

edited

Loading

We'll need to find an approach to ensure that CorrectedJetsFactory builds JER-smeared jets in a repeatable way.
Options include:

Seed once per chunk (will only be deterministic for the same chunk splitting)
Seed once per event (too expensive in numpy, maybe a numba method could produce the RNG value quickly)
Directly construct a random number by hashing some set of event and jet attributes

CMSSW and NanoAODTools uses once-per-event seeding.
Direct construction could be done by using an integer hashing function and then apply Box-Muller

nsmith- added the enhancement label

lgray mentioned this issue

Setup speed and more deterministic behavior for jetmet tools #484

Merged

5 tasks

lgray closed this as completed in #484

nsmith- mentioned this issue

Picking 'random' numbers which will always be the same for a given event? #682

Closed

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment