Alejo Paullier

After much debugging the problem was due to negative values in bounding boxes data for their `x` and `y` coordinates as well as heights and widths of bounding boxes.

@younesbelkada I shared a [notebook](https://www.kaggle.com/code/alejopaullier/benetech-matcha-train-0-74) on how to train Matcha/Pix2Struct model for Kaggle's Benetech competition, in case anyone is interested. This model achieved silver zone and includes the updates with...