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CEC2010 presentation of the work "Evolving Natural Language Grammars without Supervision"
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Cec2010 araujo santamaria
1.
2.
3.
4.
Information extraction, etc.
5.
6.
GI Sintactically annotated
texts S NP VP NP NN NNS VP VBD PP PP IN NNP S NP VP NP NP NP NN NNS VBD PP Factory payrolls fell IN NNP in september
7.
8.
9.
The inferred grammar
depends on the type of the texts : newspapers, tales, poetry,...
10.
11.
12.
13.
14.
15.
16.
Individuals :
possible parse trees of the sentence (the leaves the whole sequence of POS tags of the sentence).
17.
Initial population :
randomly created.
18.
19.
20.
21.
22.
Grouping : Convert
in constituent a randomly sequence of POS tags
23.
Group-ungroup : group
and ungroup at the same time
24.
25.
Measures : recall,
precision and their armonic mean F1.
26.
Bracked representation of
the sentences:
27.
c(c(DT,NN),c(VBD,c(c(DT,NN),c(IN,c(NN))))
28.
29.
Recall : Number
of brackets in the correct tree which are in the evaluated one
30.
F1:
31.
32.
33.
34.
The results are
stable for different constituent sizes
35.
It performs similarly
than more refined systems.
36.
There are a
lot of room for improvement in the fitness function.
37.
38.
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