Where formula 26 is the expectation over all distributions formula 27 , except formula 21 . Thus , if we set formula 21 to be maximized , the bound formula 9 is formula 22 .
Where formula _ 26 is the expectation over all distributions formula _ 27 except formula _ 21 . Thus , if we set formula _ 21 to be formula _ 22 , the bound formula _ 9 is maximized .