Who writes a lot of papers in Machine Learning ?
SELECT DISTINCT t1.authorname FROM paperkeyphrase AS t2 JOIN keyphrase AS t4 ON t2.keyphraseid  =  t4.keyphraseid JOIN writes AS t3 ON t3.paperid  =  t2.paperid JOIN author AS t1 ON t3.authorid  =  t1.authorid WHERE t4.keyphrasename  =  "Machine Learning" GROUP BY t1.authorname ORDER BY COUNT ( DISTINCT t3.paperid ) DESC;
SELECT DISTINCT t1.authorname FROM paperkeyphrase AS t2 JOIN keyphrase AS t4 ON t2.keyphraseid  =  t4.keyphraseid JOIN writes AS t3 ON t3.paperid  =  t2.paperid JOIN author AS t1 ON t3.authorid  =  t1.authorid WHERE t4.keyphrasename  =  "Machine Learning" GROUP BY t1.authorname ORDER BY COUNT ( DISTINCT t3.paperid ) DESC;
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