http://www.digitaljournal.com/tech-and-science/technology/artificial-intelligence-used-to-mark-exam-papers/article/523361

“Trials in China have shown how artificial intelligence can at least match, and sometimes surpass, the ability of teachers to mark exam papers. One in every four schools is evaluating machine-led technology.”
While this is being used in a fairly specific educational context, there is possibly scope for making better use of AI in formative feedback on tasks that are reasonably routine.