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  1. Data Management
  2. DM-14439

Explore numeric difference in Mac/Linux ConstrainedPhotometry fitting

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    • Type: Story
    • Status: Invalid
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: jointcal
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      Description

      While working on DM-14155, I discovered that Linux and Mac produce different results in the DECAM ConstrainedPhotometryModel tests. This may be a hint about why that model is unstable and not producing good fits, or it may be due to something else. Either way, I should understand what's going on, which is going to require a bunch of debug printing, and maybe looking at the matrix elements themselves.

      As an example, after the error scales are frozen, the mac chi2/ndof is 5073.41/2108, while on linux it is 5072.94/2108. Subsequently, different outliers are rejected and the final fits are measureably different.

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              • Assignee:
                Parejkoj John Parejko
                Reporter:
                Parejkoj John Parejko
                Watchers:
                Dominique Boutigny, Eli Rykoff, Jim Bosch, John Parejko, John Swinbank, Pierre Astier, Robert Lupton
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