The original work of this tool is:
Agerri, R., Vicente, I. S., Campos, J. A., Barrena, A., Saralegi, X., Soroa, A., & Agirre, E. (2020). Give your text representation models some love: the case for basque. arXiv preprint arXiv:2004.00033.
Berteus_fill_mask tool that predicts which word fits in a masked space on a text using the basque masked language model BERTEUS.