Title: ErrorAug: Making Errors to Find Errors in Semantic Segmentation. Abstract: In order to develop trustworthy downstream applications for semantic segmentation models, it is important to not only understand the performance of a model on  datasets, but to localize areas where the model may produce errors.
Pixel-wise error prediction of semantic segmentation maps is a challenging problem in which prior work relies on complicated image resynthesis pipelines.
We introduce \it{error augmentation}, a framework which enables us to learn robust error detectors by applying data transformations independently on the predicted segmentation maps.
This approach enables direct prediction of pixel-wise error in semantic segmentation maps, an approach explored as a naive baseline in prior works, to achieve state of the art performance.  
As a proof-of-concept we propose a series of three simple transformations that generate challenging segmentation errors by swapping pixel predictions within a segmentation map.
Our approach outperforms previous methods of error detection for semantic segmentation across all metrics and improves performance by over $7.8\%$ on AUPR-Error.
Additionally, we show that our approach not only generalizes to unseen test examples, but remains reliable despite significant shifts in the target domain.
