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Photonics Table Bin Optimization for Simulation Speed-Up

Explore the optimization of binning strategy in photonics tables for faster simulations, covering light tracking and source binning, table types, and testing procedures.

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Photonics Table Bin Optimization for Simulation Speed-Up

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  1. Photonics TablesBin OptimizationKyle MandliPaolo DesiatiUniversity of Wisconsin – MadisonWuppertal AMANDA Collaboration Meeting

  2. Where are we ? • Stephan: comparison between PTD bulk tables and Photonics bulk tables (muon, shower) • Check if Photonics bulk tables are consistent with PTD • New AMASIM release and bulk tables test • Thomas: implement PSI interface for Photonics, PTD and NN-fit tables • Johan: work with Thomas in PSI and produce Stephan’s test using PSI • Check results consistency with different interface (IceCube) • Daan: working on NN-fit procedure of Photonics tables and produce comparison tests with tables themselves • Check if NN fit are a good approximation to speedup simulations

  3. Where are we ? • Ignacio: implement the zenith bin-wise production • Another simulation speed up possibility • Adam,David H.: check memory map feasibility • Yet another simulation speed up possibility • Kyle M.: Photonics tables bin optimization • Come up with a binning as a good compromise between good ice description and an acceptable table size Bin optimization is the topic of this talk

  4. 1-slide tutorial • Light tracking binning: • Photons tracked using 6 parameters: ρ, φ , z, t, θe, θa • This affects the table size • Light source binning: • depth (z) & angle (θ) binning • This affects the number of tables • Table types: • Point-like ems and muon tables (differential or level1 tables) • Infinite muon tables (extended source or level2 tables) • Time-integrated amplitude PDF tables (.abs, smaller tables) • Integral PDF time tables (.prob, full binning tables) • Differential time probability table http://amanda.wisc.edu/simulation/photoproduction/tables

  5. Bin optimization proposed procedure • Produce single tables @ given source locations (z=0): only ice properties • Produce this table with different tracking binning in ρ, φ, z, t, (θe,θa integrated) • with statistical errors (interfaces do not read errors at the moment)

  6. Optimization procedure • Use Time delay distribution @ given source-receiver dist d • Receiver at reference origin • Light sources (10 GeV ems) on z=0, random in circle at a given d • Sampling different table projections as in a simulation • Mean Amplitude & Mean Time Delay versus distance d • Light sources on z=0, random in disk up to ρmax • Perform a statistical test on ems tables • Kolmogorov-Smirnov test between most dense table and the others • Calculate max y distance of cumulative histo and the probability that the 2 histograms are generated by a random sampling of the same distribution • Use of PSI => advantage of root => still in development (but new release now)

  7. Time delay distribution 20,000 random samples

  8. Time delay distribution 20,000 random samples

  9. Time delay distribution 20,000 random samples

  10. K-S Test: what we expect • Compare the most dense table with the others • Calculate the probability that tables in each pair is derived by random sampling of the same distribution • Test statistic depends on K-S max distance and number of entries in each histo Prob Increase prob tab-pairs Increase bins

  11. K-S Test

  12. K-S Test

  13. Table bins reminder • Tab 5 seems to be ~10% consistent with the most dense table • Statistical errors from tables (not accessible) and MC simulation

  14. Mean Amplitude & Time Delay vs distance

  15. Mean Amplitude & Time Delay vs distance

  16. Mean Amplitude & Time Delay vs distance

  17. K-S Test

  18. K-S Test

  19. Table bins reminder • Given statistical fluctuations and table size: Tab 5 good compromise

  20. Other tests • A set of tables where only one dimension tracking binning is varied • The test suggests that changing binning in one dimension does not significantly affect the tables precision for a relatively wide range of binning. • A set of infinite muon tables to perform the same test • This test was NOT done so far • Would require other tables … • The source location binning to be tested (= layers) • NEXT STEP : it requires the generation of whole set of tables

  21. Conclusion on tracking binning • Suggested table with enough precision and reasonable size • We already used this. Not much improvement ! • Infinite muon Tables • These tables have not been tested (educated guess so far)

  22. Source location binning • What we used so far • With these values we have • 779 ems.prob + 779 ems.abs = 1558 ems tables = 2.34 GB • 779 mu.prob + 779 mu.abs = 1558 mu tables = 4.67 GB • 779 mu.prob + 779 mu.abs = 1558 mu tables = 2.34 GB • Total size : ~ 7 GB (4.67 GB)

  23. Size and Speed • Angular splitting in simulation • Load only the tables corresponding to all z-values and to only the 2 θ-values around the muon track zenith angle • Gain a factor 18/2=9 table size to load = 520 MB • Use of NN fits of the tables • Do not load any table but use the fit function • The function is complicated but <<< 1GB • Speed seems to be very competitive versus tables • Precision under extensive check • Memory mapping • Load tables (or portion of tables) on disk and access them using specific algorithm • Under investigation. More complicated than it seems.

  24. Final Table Production • Produce baseline tables (ems, muon diff tables) • Photon survival probability only with ice properties • Binned in θa • Store those tables : 86 GB but only once ! • Different efficiencies can be included without re-generating tables • Include efficiencies, and produce .prob, .abs and .diff • Special tables: • UHE, monopole tables : wider ranges (up to 1000 m in z and ρ) • .diff (dP/dt) tables for reconstruction with finer bins and less dimensions • Propose to generate them separately

  25. Final Table Production • Efficiencies to be included • Like in previous tables production ?

  26. Conclusions • Lots of progress recently and still on the way • Waiting for layered tables: will be on disk next week • Still waiting for me ? I remind that we already have tables ! • Efficiencies can be changed faster • Start simulation for further tests • Purely interface reading (i.e. PSI) • AMASIM runs: speed • Theta angle binning of muons • NN testing • NEED OF PEOPLE CURIOUS ABOUT THE SECRETS OF PHOTONICS

  27. Conclusions http://amanda.wisc.edu/simulation/photoproduction/tables

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