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  1. Data Management
  2. DM-17847

Update defaults in scarlet and create changelog

    Details

    • Type: Story
    • Status: Done
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: meas_deblender
    • Labels:
      None
    • Templates:
    • Story Points:
      1
    • Sprint:
      DRP S19-3
    • Team:
      Data Release Production

      Description

      Peter Melchior and I have found that some of the default parameters in scarlet need to be modified to more useful values.

      1. Normalizing the morphology (S matrix) so that the peak value is set to unity is the most effective way to break the SED/morphology degeneracy, as opposed to the current method of normalizing the SED (A matrix). This provides a method to separate sources with similar colors but very different intensities and also converges more quickly than the current default normalization.

      2. Turning off Nesterov acceleration. There appears to be an issue with combining our proximal gradient method with Nesterov acceleration, making the optimization algorithm asymptotic. It also appears to be even more unstable with the new normalization scheme, however using S matrix normalization without acceleration still runs faster than A matrix normalization with acceleration.

      This ticket will also create a change log in scarlet to keep track of these and other modifications to keep users up to date with the changes. It will also make it easier to keep stack users up to date when updated versions of scarlet are imported into the stack.

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            • Assignee:
              fred3m Fred Moolekamp
              Reporter:
              fred3m Fred Moolekamp
              Reviewers:
              Peter Melchior
              Watchers:
              Fred Moolekamp, Peter Melchior
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              Dates

              • Created:
                Updated:
                Resolved:

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