I am looking for data sets that I could use to train and benchmark negation detection systems.
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1Negation detection is a good idea in principle -- like a universal translator -- but it has similar problems in practice. Negation is a really complicated matter, and overt negative quantifiers or predicates don't begin to exhaust the topic. – jlawler Jan 31 '17 at 23:59
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Some (all?) datasets from the Automatic Content Extraction (ACE) Program
Unfortunately, it is not available free of charge.