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LDMX-Software / Ecal

Software module for digitizing, reconstructing, and vetoing within the ECal.
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TDecompSVD::Decompose depends on some random-ness #29

Open tomeichlersmith opened 3 years ago

tomeichlersmith commented 3 years ago

This was found when analyzing mistakenly-made duplicate files off the LDCS-EaT 1e13 campaign. Basically, somewhere deep in the ROOT-algorithm in TDecompSVD, there is some random seeding which means very rarely two calls to TDecompSVD will not yield the same result.

Since this is so rare it is not a priority, but it would be nice to fix so that the entire pipeline can be perfectly re-simulated if needbe.

omar-moreno commented 3 years ago

Nice catch!

On Fri, Mar 19, 2021 at 12:29 PM Tom Eichlersmith @.***> wrote:

This was found when analyzing mistakenly-made duplicate files off the LDCS-EaT 1e13 campaign. Basically, somewhere deep in the ROOT-algorithm in TDecompSVD, there is some random seeding which means very rarely two calls to TDecompSVD will not yield the same result.

Since this is so rare it is not a priority, but it would be nice to fix so that the entire pipeline can be perfectly re-simulated if needbe.

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