For the task of unsupervised dependency parsing , Smith and Eisner ( 2006 ) add a constraint of the form `` the average length of dependencies should be X '' to capture the locality of syntax ( at least half of the dependencies are between adjacent words ) , using a scheme they call structural annealing .
annealing structural bias in multilingual weighted grammar induction
Noah A Smith Jason Eisner
This encourages more transitions and hence shorter phrases . For the task of unsupervised dependency parsing , Smith and Eisner ( 2006 ) add a constraint of the form `` the average length of dependencies should be X '' to capture the locality of syntax ( at least half of the dependencies are between adjacent words ) , using a scheme they call structural annealing . They modify the model 's distribution over trees pe ( y ) by a penalty term as : pe ( y ) â pe ( y ) e ( Î´ Ee â y length ( e ) ) , where length ( e ) is the surface length of edge e .
For the task of unsupervised dependency parsing , @@CITATION add a constraint of the form `` the average length of dependencies should be X '' to capture the locality of syntax ( at least half of the dependencies are between adjacent words ) , using a scheme they call structural annealing .