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Marco Turchi turchi@fbk.eu Statistical Machine Translation - ICT Doctoral School 19 March 2013 Quality Estimation Turchi, FBK 1 !"#$%&'%()#*&$+%,'-.#-/0%1(,23% 4%5&$%/6%"&'$/7+%

  1. Marco Turchi turchi@fbk.eu Statistical Machine Translation - ICT Doctoral School – 19 March 2013 Quality Estimation – Turchi, FBK 1 • !"#$%&'%()#*&$+%,'-.#-/0%1(,23% – 4%5&$%/6%"&'$/7+% – ()#*&$+%809&:#$/7'% – ()#*&$+%;:/7<'% – =<#70&0>%4*>/7&$".'% – ?#$#'<$% – ,@#*)#-/0%A<$7&:'% – BC<0%8'')<'% • ()#*&$+%,'-.#-/0%#$D% – !/79%=<@<*% – ?/:).<0$%=<@<*% • E/F%:#0%F<%)'<%(,%&0%7<#*%#CC*&:#-/0'3% Quality Estimation – Turchi, FBK 2

  2. • 4)$/.#-:%,@#*)#-/0%/6%AG%/)$C)$% G7#0'*#$<9% ;AG% G<'$%;<$%% %;/)7:<% =#0>H% G<'$%;<$% Quality Estimation – Turchi, FBK 3 • I%./7<%9&J:)*$%&6%$"<7<%#7<%./7<%;AG%'+'$<.'KKK% ;AG% ;AG% ;AG% G<'$%;<$'% ;AG% ;AG% %;/)7:<% =#0>H% G<'$%;<$% Quality Estimation – Turchi, FBK 4

  3. • E).#0%C7<'<0:<% G7#0'*#$<9% ;AG% G<'$%;<$%% • I%5)$%&$%&'D% • ')5L<:-@<% %;/)7:<% • -.<%:/0').&0>% =#0>H% G<'$%;<$% • 9&J:)*$% • 0/$%7<C*&:#5*<% Quality Estimation – Turchi, FBK 5 G7#0'*#$<9% ;AG% G<'$%;<$%% N=,O% !,M% %;/)7:<% M<6<7<0:<% G,M% =#0>H% ;:/7<% G<'$%;<$%% A<$</7% G<'$%;<$% P8;G% I% G<'$%;<$% • M<6<7<0:<%G<'$%'<$D%").#0%$7#0'*#-/0%/6% $"<%'/)7:<%*#0>)#><%$<'$%'<$%&0$/%$"<% $#7><$%*#0>)#><H% Quality Estimation – Turchi, FBK 6

  4. • =#7><%#./)0$%/6D% – %C#7#**<*%$<'$%'<$'%&0%9&Q<7<0$%*#0>)#><'D% • !/7R'"/C%/6%A#:"&0<%G7#0'*#-/0%1!AG2%STTUV%IV%STWXV% ,)7/C#7*V%4Y)&'%Z/..)0&$#&7<V%P8;G%:#.C#&>0V%I% – 4)$/.#-:%;:/7&0>%A<$"/9'%1N*<)V%G,MV%!,MV%A<$</72D% • */F%:/'$%1F7$%").#0%<@#*)#-/02% • /5L<:-@<%1)05&#'<92% • &06/7.#-@<%16/7%'+'$<.%9<@<*/C<7'2D%$/%C7/[*<%'+'$<.%5<"#@&/7% • 9&':7&.&0#-@<D%$/%$<**%&6%#09%F"<7<%&.C7/@<.<0$'%#7<% • <Q<:-@<%#09%7<C*&:#5*<D%$/%5<%:/.C)$<9%Y)&:R*+%#09%/\<0% Quality Estimation – Turchi, FBK 7 • ]<76<:$%'<^0>%&0%$"<%:/0$7/**<9%':<0#7&/%1*#5%$<'$'V% <@#*)#-/0%:#.C#&>0'V%I2%F"<7<%&$%&'%7<Y)&7<9%$/%:/.C#7<% '<@<7#*%'+'$<.'%/0%#%>&@<0%$<'$%'<$H% • 5)$%I% ? Quality Estimation – Turchi, FBK 8

  5. %;/)7:<% G7#0'*#$<9% ;AG% ;<0$<0:<% ;<0$<0:<% • In real applications, several questions : – Is the translated text good enough to be published? – Can we trust it? – Can a reader get the gist? – Is it worst to post-edit it? • Quality Estimation (QE) can help us to find the right answers!! Quality Estimation – Turchi, FBK 9 • ()#*&$+%,'-.#-/0%1(,2D% – .<$7&:'%$"#$%C7/@&9<%#0%<'-.#$<%/0%$"<%Y)#*&$+%/6% )0'<<0%$7#0'*#$<9%$<_$'%F&$"/)$%$"<%7<6<7<0:<% $7#0'*#-/0'%% – #%')C<7@&'<9%*<#70&0>%$#'RV%F"<7<%#%.#:"&0<%$7&<'% $/%./9<*%"/F%").#0'%L)9><%$7#0'*#$<9%$<_$'% 1*<#70&0>%67/.%").#0%*#5<*<9%9#$#2%% Quality Estimation – Turchi, FBK 10

  6. G7#0'*#$<9% =#5<*<9% ;AG% G<'$%;<$%% ?#$#% %;/)7:<% (,% ()#*&$+% =#0>H% ]7<9&:-/0`% ,'-.#$/7% G<'$%;<$% `%':/7<%#$%'<0$<0:<%*<@<*% Quality Estimation – Turchi, FBK 11 • Automatic Evaluation: – require parallel test sets – fundamental in controlled experiments – compare different system performances • Quality Estimation: – does not require parallel data, but labeled data – application oriented • Both very complex tasks Quality Estimation – Turchi, FBK 12

  7. • Example 1: • ;/)7:<D% – a80%Y)<'$#%'&$)#b&/0<V%c%C/''&5&*<%:7<#7<%)0% '#*@#$#>>&/d%#*%$<7.&0<V%&*%'#*@#$#>>&/%c%&09&C<09<0$<% 9#*%@/*).<%9&%C7/9)b&/0<He% • G#7><$D% – a80%$"&'%'&$)#-/0V%+/)%:#0%:7<#$<%#%5#:R)CV%#\<7%$"<% 5#:R)C%.#+%5<%&09<C<09<0$%/6%$"<%@/*).<%/6% C7/9):-/0Hf% • Can a reader get the gist? • Is the translated text good enough to be published? Quality Estimation – Turchi, FBK 13 • Example 2: • ;/)7:<D% – a80%Y)<'$#%'&$)#b&/0<V%c%C/''&5&*<%:7<#7<%)0% '#*@#$#>>&/d%#*%$<7.&0<V%&*%'#*@#$#>>&/%c%&09&C<09<0$<% 9#*%@/*).<%9&%C7/9)b&/0<He% • G#7><$D% – a80%$"&'%'&$)#-/0V%+/)%:7<#$<%#%'#*@#$#>>&/%#09%#\<7%&$% :/.C*<$<'V%$"<%'#*@#$#>>&/%&'%&09<C<09<0$%/6%$"<% C7/9):-/0%@/*).<Hf% • Can a reader get the gist? • Is the translated text good enough to be published? Quality Estimation – Turchi, FBK 14

  8. • Example 3: • ;/)7:<D% – a80%Y)<'$#%'&$)#b&/0<V%c%C/''&5&*<%:7<#7<%)0% '#*@#$#>>&/d%#*%$<7.&0<V%&*%'#*@#$#>>&/%c%&09&C<09<0$<% 9#*%@/*).<%9&%C7/9)b&/0<He% • G#7><$D% – a80%$"&'%'&$)#-/0V%+/)%:#0%:7<#$<%#%5#:R)CV%#\<7%$"<% 5#:R)C%.#+%5<%&09<C<09<0$%/6%$"<%@/*).<%/6% C7/9):-/0Hf% -1(Bad) 1 (Good) Quality Estimation – Turchi, FBK 15 • Example 4: • ;/)7:<D% – a80%Y)<'$#%'&$)#b&/0<V%c%C/''&5&*<%:7<#7<%)0% '#*@#$#>>&/d%#*%$<7.&0<V%&*%'#*@#$#>>&/%c%&09&C<09<0$<% 9#*%@/*).<%9&%C7/9)b&/0<He% • G#7><$D% – a80%$"&'%'&$)#-/0V%+/)%:#0%:7<#$<%#%5#:R)CV%#\<7%$"<% 5#:R)C%.#+%5<%&09<C<09<0$%/6%$"<%@/*).<%/6% C7/9):-/0Hf% 1(Bad) 2(Fair) 3(Partially Good) 4(Good) Quality Estimation – Turchi, FBK 16

  9. • ;/)7:<D% – a80%Y)<'$#%'&$)#b&/0<V%c%C/''&5&*<%:7<#7<%)0% '#*@#$#>>&/d%#*%$<7.&0<V%&*%'#*@#$#>>&/%c%&09&C<09<0$<% 9#*%@/*).<%9&%C7/9)b&/0<He% • G#7><$D% – a80%$"&'%'&$)#-/0V%+/)%:#0%:7<#$<%#%5#:R)CV%#\<7%$"<% 5#:R)C%.#+%5<%&09<C<09<0$%/6%$"<%@/*).<%/6% C7/9):-/0Hf% • ]/'$g,9&$%;<0$<0:<D% – a80%$"&'%'&$)#-/0V%+/)%:7<#$<%#%5#:R)C%#09%#\<7%&$% :/.C*<$<'V%$"<%5#:R)C%&'%&09<C<09<0$%/6%$"<% C7/9):-/0%@/*).<Hf% Quality Estimation – Turchi, FBK 17 • !"#$%:#0%(,%C7<9&:$3% – 7<>7<''&/0%C7/5*<.D%#%7<#*%0).5<7%Y)#*&$+%':/7<%1<H>H% hTHHUi2% – :*#''&[:#-/0%C7/5*<.D%#%:#$<>/7+%*#5<*%1<H>H%5#9%/7%>//92 % – 7#0R&0>%C7/5*<.D%$"<%7#0R%/6%#%'<$%/6%'<0$<0:<'%1<H>H% ' U V' X V' j V%I2% • !"<7<%:#0%(,%5<%)'<93D% – '<0$<0:<%*<@<*% – F/79%*<@<*% – 9/:).<0$%*<@<*%%% Quality Estimation – Turchi, FBK 18

  10. • !"#$%&'%()#*&$+%,'-.#-/0%1(,23% – 4%5&$%/6%"&'$/7+% – ()#*&$+%809&:#$/7'% – ()#*&$+%;:/7<'% – =<#70&0>%4*>/7&$".'% – ?#$#'<$% – ,@#*)#-/0%A<$7&:'% – BC<0%8'')<'% • ()#*&$+%,'-.#-/0%#$D% – !/79%=<@<*% – ?/:).<0$%=<@<*% • E/F%:#0%F<%)'<%(,%&0%7<#*%#CC*&:#-/0'3% Quality Estimation – Turchi, FBK 19 • ()#*&$+%,'-.#-/0%&'%#0%/*9k0<F%$/C&:H% • lEO%!/7R'"/C%STTX%mlEOVSTTXnD% – ]7<9&:$%N=,OV%G,M%#09%!,M% – Bad %AG%/)$C)$% ! hard to beat the baselines – No real use in applications Quality Estimation – Turchi, FBK 20

  11. • Specia et al, 2009 [Spe,2009]: – Better MT output – More attention in the private sector – Predict Post-Editing (PE) Effort • human effort to transform the MT output into a good text (Post-editing time, human scores, % errors to fix) – First dataset freely available Quality Estimation – Turchi, FBK 21 • Specia et al, 2010 [Spe,2010]: – New interpretation of QE: – Predict the MT evaluation: – Select the best translation from multiple MT-systems – Filtering out bad translations – Regression vs Binary Classification vs Multi-label Classification Quality Estimation – Turchi, FBK 22

  12. • !/7R'"/C%/0%AGV%STWSV%'"#7<9%$#'R%()#*&$+%,'-.#-/0%mZ#*VWSn%% – Training/test data with human annotation (1..5) – 11 participants – Scoring and ranking tasks – New quality indicators (features) – Tested a large number of machine learning techniques • Workshop on MT, 2013, shared task Quality Estimation… – coming soon Quality Estimation – Turchi, FBK 23 • !"#$%&'%()#*&$+%,'-.#-/0%1(,23% – 4%5&$%/6%"&'$/7+% – ()#*&$+%809&:#$/7'% – ()#*&$+%;:/7<'% – =<#70&0>%4*>/7&$".'% – ?#$#'<$% – ,@#*)#-/0%A<$7&:'% – BC<0%8'')<'% • ()#*&$+%,'-.#-/0%#$D% – !/79%=<@<*% – ?/:).<0$%=<@<*% • E/F%:#0%F<%)'<%(,%&0%7<#*%#CC*&:#-/0'3% Quality Estimation – Turchi, FBK 24

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