Probably exceeding the accuracy of a "single human rater".
Note, the definition of a "human rater accuracy" is a bit vague. For example an "Amazon Turk rater" qualifies as a human rater, yet the accuracy of such rater can be easily exceeded by an accuracy of dedicated grad student rater, or an accuracy of a dedicated H1 employee rater.
edit: That's my guess from previous (2.5 years back) work in computer vision / imagenet and a quick skim over the article.
Note, the definition of a "human rater accuracy" is a bit vague. For example an "Amazon Turk rater" qualifies as a human rater, yet the accuracy of such rater can be easily exceeded by an accuracy of dedicated grad student rater, or an accuracy of a dedicated H1 employee rater.
edit: That's my guess from previous (2.5 years back) work in computer vision / imagenet and a quick skim over the article.