One commenter pointed out that the "decade" category seemed especially hard for Watson. According to Jennings, ". . . it took a little while to figure out that the answers would all be decades. This seems incredible to a human playing along at home, but basic contextual issues like this are incredibly hard for machine intelligence to master. The cool thing about Watson is it learns from those mistakes. By the end of the category, it had learned that the answers were going to be decades and adjusted accordingly."
But Wasn't So Good With Decades
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