Streamline DeepBedMap model tuning, evaluation and Antarctic-wide DEM generation

[weiji14]

Towards making a new full DeepBedMap of Antarctica, replacing the one in #136. There has been lots of significant changes to our input training datasets (e.g. #146, #150, #155), to our ESRGAN model (e.g. #151) plus software related changes since v0.8.0. Some of the scripts run slower and struggle to handle our big datasets, but they have become more geographically accurate and is now ready for prime time. Let's iron those problems out and make a new 250m spatial resolution bed elevation map of Antarctica!!!

TODO:

• [x] Quad-GPU hyperparameter re-tuning on rounded grids from #155 (7c9dce987b584918ab4a5f3cecf046c383a20cf6)
• [x] Streamline loading model weights and params from Comet.ML, re-upload 2007tx.nc test region grids to quilt and evaluate model on that area (fc164eb7b5c5648f30eb6fe64ed2c0e74aa0af79, 8ed1273abf0a5eabbceac8b04d9cef6c6f7aa1c1)
• [x] Evaluate on Pine Island Glacier region (5940771566e0f8da262e3cb0fc92bf77359c43ad)
• [x] Refactor (read: hack) 'whole of Antarctica tiler and predictor' for efficiency to recreate a new DeepBedMap DEM for the whole of Antarctica! (aac21fb8200f8e34c56403210bb36d1b9ce0f031)

[review-notebook-app[bot]]

Check out this pull request on ReviewNB: https://app.reviewnb.com/weiji14/deepbedmap/pull/156

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