During production of this paper, an error was introduced to the formula on the bottom of the right column of page 1020. In the last two terms of the formula, the n and m subscripts were swapped. The correct formula is:
The paper has been updated.
This content is only available as a PDF.
© 2021 Association for Computational Linguistics. Distributed under a CC-BY 4.0 license.
Association for Computational Linguistics. Distributed under a CC-BY 4.0 license.
This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. For a full description of the license, please visit https://creativecommons.org/licenses/by/4.0/legalcode