Experts, Errors, and Context: A Large-Scale Study of Human Evaluation for Machine Translation Markus Freitag author George Foster author David Grangier author Viresh Ratnakar author Qijun Tan author Wolfgang Macherey author 2021 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal freitag-etal-2021-experts 10.1162/tacl_a_00437 https://aclanthology.org/2021.tacl-1.87/ 2021 9 1460 1474