This heuristic is called soft union ( DeNero and Klein 2007 ) .
tailoring word alignments to syntactic machine translation
John DeNero Dan Klein
We include a point in the final alignment if the average of the posteriors under the two models for that point is above a threshold . This heuristic is called soft union ( DeNero and Klein 2007 ) . Figure 8 shows the Precision/Recall curves after symmetrization for the En-Fr corpus .
This heuristic is called soft union ( @@CITATION ) .