sentence1: but more recent approaches have tried to minimize the amount of supervision necessary ( cite-p-20-3-15 , cite-p-20-3-4 , cite-p-20-1-1 ) .
sentence2: recent approaches try to minimize the amount of supervision needed ( cite-p-20-3-15 , cite-p-20-1-1 , cite-p-20-3-12 ) .