Database: scholar
Question: which topics were most popular at NIPS 2015
SQL:
SELECT DISTINCT COUNT ( t3.paperid )  ,  t1.keyphraseid FROM paperkeyphrase AS t2 JOIN keyphrase AS t1 ON t2.keyphraseid  =  t1.keyphraseid JOIN paper AS t3 ON t3.paperid  =  t2.paperid JOIN venue AS t4 ON t4.venueid  =  t3.venueid WHERE t3.year  =  2015 AND t4.venuename  =  "NIPS" GROUP BY t1.keyphraseid ORDER BY COUNT ( t3.paperid ) DESC;