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Hierarchical A* Parsing with Bridge Outside Scores

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Figure

Figure 1: Representations of the different types of itemsused in parsing and how they depend on each other.O˜(BHA(a)In HA∗ , the inside item I ( VPt , 3 , 5 )relies on the coarseoutside item O( πt(  VPt) ,  3 , 5 ) for outside estimates
Table 1: HA∗ deduction rules. Red underline indicates items constructed under the previous grammar in the hierarchy.
Figure 3: Performance of HA∗and BHA∗as a function ofincreasing refinement of the coarse grammar

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