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Lexicalized Tree-Adjoining Grammars (LTAG) - ad-teaching.infor...

Lexicalized Tree-Adjoining Grammars (LTAG) - ad-teaching.infor...

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Outline of the Algorithm<br />

Initialize the chart C with items of the form<br />

[α, 0, la, 0, −, −, 0, ⊥], where α ∈ I , root label S.<br />

Then use 4 types of operations to <strong>ad</strong>d new items to C:<br />

Scan, Predict, Complete, Adjoin<br />

Operations stated as inference rules:<br />

item 1 · · · item m<br />

item ∗<br />

conditions<br />

Add item ∗ to C if item 1 ,· · ·, item m ∈ C and conditions are met.<br />

Accept input string c 1 · · · c n if C contains at least one item<br />

[α, 0, ra, 0, −, −, n, ⊥], where α ∈ I , root label S.<br />

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