On Context Span Needed for Machine Translation Evaluation (2020.lrec-1)

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Challenge: a number of common patterns can be observed for context-aware MT evaluation, authors say . document-level evaluations have largely been performed at the sentence level . the definition of what constitutes a "document level" evaluation is still unclear .
Approach: They propose to use a series of surveys to identify the necessary context span . they find common patterns that can be used to draw general guidelines .
Outcome: The proposed evaluations of machine translation systems show that some issues and spans depend on domain and target language.

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Challenge: Recent work has cast doubt on whether context-aware machine translation models learn useful signals from context or are improvements in automatic evaluation metrics just a side-effect.
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