Natural Language Processing · free preview
Semantic Roles and Frame Semantics
Thematic roles and their definitional problems, PropBank numbered arguments, FrameNet frames, role labeling as classification, and selectional preferences.
1. Semantic Roles and Frame Semantics
Semantic Roles and Frame Semantics
2. Numbered arguments and frames
Numbered arguments and frames
3. Labeling roles from a shallow parse
Labeling roles from a shallow parse
4. What arguments are plausible
What arguments are plausible
5. Reading a frameset off a sentence
Using the frameset where ARG0 is the loader, ARG1 the cargo, ARG2 the destination and ARG3 the source, what roles do the crew, the crates and the pier carry in the crew unloaded the crates at the pier?
6. Roles under the passive
In the sails were stowed by the skipper, which mapping of surface positions to the frameset roles is correct if ARG0 is the stower and ARG1 the thing stowed?
7. Computing labeled F1
A semantic role labeler is evaluated on gold spans and labels, achieving labeled precision and labeled recall . Compute its labeled F1, rounding to three decimals.
8. Why one frame beats many framesets
The change-of-position-on-a-scale frame collects rise, fall, increase and their nominal forms. What does this buy over per-verb PropBank-style framesets?
9. When local classifiers disagree
A local role classifier labels two constituents of one predicate both as ARG0, and one of them overlaps the span of the other. Why is this a global problem, and what fixes it?
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