Compositional and lexical semantics Flashcards
1
Q
What is Hyponymy?
A
The IS-A relation between words.
2
Q
What is Meronymy?
A
The PART-OF relation between words.
3
Q
What is Synonymy?
A
The phenomenon of two different words having the same meaning.
4
Q
What is Antonymy?
A
The phenomenon of two words having opposite meanings.
5
Q
What are some uses of lexical semantics?
A
- Semantic classification for selectional restrictions, e.g the object eat has got to be something edible.
- Shallow inference, e.g X murdered y => X killed Y.
- Query expansion?
6
Q
What is polysemy?
A
Polysemy is where two words with the same spelling have different meanings.
7
Q
How can word sense disambiguation be evaluated?
A
- Inventory of senses can be taken from wordnet.
- Baseline is to pick the most frequent sense.
8
Q
What are the salient features of WSD?
A
- Unsupervised approach.
- Relies on use of collocates, a group of two or more words which occur togetehr more often than would be expected by chance.
- Assumes one sense per collocation.
- Can be improved by assuming one sense per discourse.
- Yarowsky argues that decision list classifiers work better than other approaches because they don’t attempt to combine probabilities, which would be complex, because they are not independent of each other.
