[Backfill corrections] Run geo loops in parallel #1808
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Description
Parallelize model training/predicting over geos (states or counties). Update production params to use 2 cores by default, which speeds up modeling/training by about 2x. My local runs with more than 2 cores were memory-limited and adding additional cores didn't increase speed that much, but that's worth looking at again in staging.
Changelog
main.R