Xview2: oversampling images with building damage #109
Merged
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This adds the option to the xView2 dataset to oversample images containing any building damage and enables it by default, to counter-act the strong class imbalance on the image level. This image oversampling happens is independent of the importance cropping that is applied during training.
This approach was already used in the original competition-winning solution, and I think it should be used by default in all xView2 experiments. My more non-standard attempts at getting to a reasonable performance will be pushed to a separate branch.