Dependency Grammar-based Relation Recognition Classifier Example
This page contains example of Dependency Grammar-based Relation Recognition Classifiers
The tools used include
- For Semantic Role Labelling http://l2r.cs.uiuc.edu/~cogcomp/srl-demo.php
- For Dependency Grammar Parsing http://josie.stanford.edu:8080/parser/
Example 1
This is an example drawn from (Bunescu and Mooney, 2005) and their example reverse engineered with SRL and Stanford Parser information.
- Sentence: Protesters seized several pumping stations, holding 127 Shell workers hostage.
Dependency Grammar
http://www.gabormelli.com/images/DepGramBasedClassifier_Eg1.jpg includes example of both Local Dependency and Non-local Dependency
Dependency Grammar (with short and long dependencies)
This is the result from the Stanford Parser. It leads to many of the same local word-word associations as in the illustration. Differences include in the role that workers and hostage play.
nsubj(seized-2, Protesters-1)
amod(stations-5, several-3)
amod(stations-5, pumping-4)
dobj(seized-2, stations-5)
xcomp(seized-2, holding-7)
num(hostage-11, 127-8)
nn(hostage-11, Shell-9)
nn(hostage-11, workers-10)
dobj(holding-7, hostage-11)
Semantic Role Labeling
http://www.gabormelli.com/wiki/research/images/DepGramBasedClassifier_Eg1_SRL.jpg
Sample Relations
| Relation Instance | Shortest Path in Undirected Dependency Graph |
| protesters AT stations | protesters ⇒ seized <= stations |
| workers AT stations | workers ⇒ holding <= protesters ⇒ seized <= stations |
Example 2
This is an example drawn from (Bunescu and Mooney, 2005) and their example reverse engineered with SRL and Stanford Parser information.
- Sentence: Troops recently have raided churches, warning ministers to stop preaching.
Dependency Grammar (with short and long dependencies)
http://www.gabormelli.com/wiki/research/images/DepGramBasedClassifier_Eg2.jpg includes example of both Local Dependency and Non-local Dependency
Dependency Grammar (with only short dependencies)
nsubj(raided-4, Troops-1)
advmod(raided-4, recently-2)
aux(raided-4, have-3)
dobj(raided-4, churches-5)
xcomp(raided-4, warning-7)
dobj(warning-7, ministers-8)
aux(stop-10, to-9)
xcomp(warning-7, stop-10)
dobj(stop-10, preaching-11)
Semantic Role Labeling
http://www.gabormelli.com/wiki/research/images/DepGramBasedClassifier_Eg2_SRL.jpg
Sample Relations
| Relation Instance | Shortest Path in Undirected Dependency Graph |
| troops AT churches | troops ⇒ raided <= churches |
| ministers AT churches | ministers ⇒ warning <= troops ⇒ raided <= churches |