Difference between revisions of "Machine translation with Constraint Grammar"
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==Input== |
==Input== |
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The input is a standard CG format stream with dependency labels (this can also be with CG-proc and [[Apertium stream format]]). |
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<pre> |
<pre> |
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===Lexical=== |
===Lexical=== |
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You can use some other system for lexical transfer (e.g. an Apertium bilingual dictionary), or you can do it directly in CG. |
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<pre> |
<pre> |
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===Movement=== |
===Movement=== |
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Here we move a subject which is right of its main verb to the left (V2 → SVO). |
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<pre> |
<pre> |
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=== Generation === |
=== Generation === |
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In this step we add the definite article before any definite NP. |
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<pre> |
<pre> |
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$ cat /tmp/generate.cg |
$ cat /tmp/generate.cg |
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===Morphological transfer=== |
===Morphological transfer=== |
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We remove unused features like gender and definiteness. |
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<pre> |
<pre> |
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$ cat /tmp/morphtrans.cg |
$ cat /tmp/morphtrans.cg |
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SECTION |
SECTION |
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LIST ToKill = Neu Fem Msc Nom Dat Acc Indef ; |
LIST ToKill = Neu Fem Msc Nom Dat Acc Indef ; |
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SUBSTITUTE |
SUBSTITUTE ToKill (*) $$ToKill ; |
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</pre> |
</pre> |
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==Output== |
==Output== |
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And finally run the whole thing. |
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<pre> |
<pre> |
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Latest revision as of 11:35, 26 August 2011
Constraint Grammar is pretty flexible, it lets you shoot off your feet.
Input[edit]
The input is a standard CG format stream with dependency labels (this can also be with CG-proc and Apertium stream format).
"<Í>"
"í" Pr @ADVL→ #1->3
"<upphavi>"
"upphav" N Neu Sg Dat Indef @P← #2->1
"<skapti>"
"skapa" V Ind Prt Sg @VMAIN #3->0
"<Gud>"
"gudur" N Msc Sg Nom Indef @←SUBJ #4->3
"<himmal>"
"himmal" N Msc Sg Acc Indef @←OBJ #5->3
"<og>"
"og" CC @CC #6->5
"<jørð>"
"jørð" N Fem Sg Acc Indef @←OBJ #7->5
"<.>"
"." CLB #8->0
Grammars[edit]
Lexical[edit]
You can use some other system for lexical transfer (e.g. an Apertium bilingual dictionary), or you can do it directly in CG.
$ cat /tmp/lexical_transfer.cg
SECTION
SUBSTITUTE ("í") ("in") ("í");
SUBSTITUTE ("upphav") ("beginning") ("upphav");
SUBSTITUTE ("himmal") ("heaven") ("himmal");
SUBSTITUTE ("og") ("and") ("og");
SUBSTITUTE ("jørð") ("earth") ("jørð");
SUBSTITUTE ("skapa") ("create") ("skapa");
SUBSTITUTE ("gudur") ("god") ("gudur");
Movement[edit]
Here we move a subject which is right of its main verb to the left (V2 → SVO).
$ cat /tmp/movement.cg SECTION MOVE WITHCHILD (*) (@←SUBJ) BEFORE (-1* (@VMAIN)) ; SUBSTITUTE (@←SUBJ) (@SUBJ→) (@←SUBJ) (1 (@VMAIN)) ;
Generation[edit]
In this step we add the definite article before any definite NP.
$ cat /tmp/generate.cg
SECTION
SUBSTITUTE (Indef) (Def) ("beginning") ;
ADDCOHORT ("<the>" "the" Det Def Sg) BEFORE (N Def) ;
Morphological transfer[edit]
We remove unused features like gender and definiteness.
$ cat /tmp/morphtrans.cg SECTION SUBSTITUTE (Neu) (*) (Neu); SUBSTITUTE (Fem) (*) (Fem); SUBSTITUTE (Msc) (*) (Msc); SUBSTITUTE (Nom) (*) (Nom); SUBSTITUTE (Dat) (*) (Dat); SUBSTITUTE (Acc) (*) (Acc); SUBSTITUTE (Indef) (*) (Indef);
...or...
$ cat /tmp/morphtrans.cg SECTION LIST ToKill = Neu Fem Msc Nom Dat Acc Indef ; SUBSTITUTE ToKill (*) $$ToKill ;
Output[edit]
And finally run the whole thing.
$ cat /tmp/in | vislcg3 --grammar /tmp/movement.cg | vislcg3 --grammar /tmp/lexical_transfer.cg | vislcg3 --grammar /tmp/generate.cg | vislcg3 --grammar /tmp/morphtrans.cg "<Í>" "in" Pr @ADVL→ #1->5 "<the>" "the" Det Def Sg #2->2 "<upphavi>" "beginning" N Sg Def @P← #3->1 "<Gud>" "god" N Sg @SUBJ→ #4->5 "<skapti>" "create" V Ind Prt Sg @VMAIN #5->0 "<himmal>" "heaven" N Sg @←OBJ #6->5 "<og>" "and" CC @CC #7->6 "<jørð>" "earth" N Sg @←OBJ #8->6 "<.>" "." CLB #9->0
