William Coster, David Kauchak. Simple wikipedia: A new simplification task. In Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics, pp.665–669, 2011.

1. William Coster and David Kauchak.
In Proceedings of the 49th Annual Meeting of the Association
for Computational Linguistics (ACL-2011), pp.665-669, 2011.
Presented by

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BLEU 2
Simple English Wikipedia:
A New Text Simplification Task

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" 1,000 3,000
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" 1,000 3,000
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English Wikipedia &
Simple English Wikipedia
3,000 137,000

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5

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" English Wikipedia Simple English Wikipedia
2010 5
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10,588
Normal Simple

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! Regina Barzilay and Noemie Elhadad. 2003.
Sentence alignment for monolingual comparable corpora.
In Proceedings of EMNLP.
" Wikipedia
" TF-IDF
! Simple Normal 0.5
7

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Simple
Normal
Normal Simple
Normal Simple
Normal Simple
Normal Simple
i Normal
j Simple
sim(i,j): i j
TF-IDF Cosine 0.5
skip_penalty = 0.0001

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10,000
75,000
137,000
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" 100
" 2
" 0.5 91% 137,000
" 0.75 98% 90,000
10

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" Simple 65 %
" Simple 40 /
" Simple 14 /
11
Simple 27 %
Normal 23 %
Normal Simple 37 %
Normal Simple 8 %
Normal Simple 5 %

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" GIZA++
12
Normal Simple 65 %
Normal 47 %
34 %
Normal Simple 31 %
Normal Simple 27 %

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Normal As Isolde arrives at his side, Tristan dies with her name on his lips.
Simple As Isolde arrives at his side, Tristan dies while speaking her name.
Normal
Alfonso Perez Munoz, usually referred to as Alfonso, is a former
Spanish footballer, in the striker position.
Simple Alfonso Perez is a former Spanish football player.
Normal
Endemic types or species are especially likely to develop on
islands because of their geographical isolation.
Simple
Endemic types are most likely to develop on islands because they
are isolated.
13

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Normal As Isolde arrives at his side, Tristan dies with her name on his lips.
Simple As Isolde arrives at his side, Tristan dies while speaking her name.
Normal
Alfonso Perez Munoz, usually referred to as Alfonso, is a former
Spanish footballer, in the striker position.
Simple Alfonso Perez is a former Spanish football player.
Normal
Endemic types or species are especially likely to develop on
islands because of their geographical isolation.
Simple
Endemic types are most likely to develop on islands because they
are isolated.
13

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" Moses
! 124,000
! Simple n-gram
! 500
" 1,300
14
BLEU word - F1 SSA
Baseline 0.5937 0.5967 0.6179
Moses 0.5987 0.6076 0.6224
Moses-Oracle 1000-best 0.6317 0.6661 0.6550

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! English Wikipedia & Simple English Wikipedia
! 137,000 91%
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! http://www.cs.middlebury.edu/~dkauchak/simplification/
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! Moses BLEU
! Moses-Oracle BLEU 0.033
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Simple English Wikipedia:
A new simplification task