SDSS Catalog gradient descent

Lang and I worked on setting up the synthetic-image gradient-descent we are preparing for a next-generation SDSS imaging catalog. If we can get it started, we will be optimizing a multi-billion-parameter model. I have done something close before for SDSS ubercalibration, but in that project we transformed the problem into a linear fit by making some not-terrible approximations. No such luck here.

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