Apertium separable
Lttoolbox provides a module for reordering separable/discontiguous multiwords and processing them in the pipeline. Multiwords are manually written in an additional xml-format dictionary.
Installing
Prerequisites and compilation are the same as lttoolbox and apertium. See Installation. The code can be found at https://svn.code.sf.net/p/apertium/svn/branches/apertium-separable and instructions for compiling the module are ...
It is not currently part of distributed Apertium binaries.
Lexical transfer in the pipeline
lsx-proc runs between apertium-tagger and apertium-pretransfer:
… | apertium-tagger -g eng.prob | lsx-proc english.bin | apertium-pretransfer | …
Example
A sentence in plain text,
Thus, it was asserted that a tax on foreign workers would reduce the numbers coming in and “taking jobs away” from American citizens.
This is the output of feeding the sentence through apertium-tagger :
^thus<adv>$^,<cm>$ ^prpers<prn><subj><p3><nt><sg>$ ^be<vbser><past><p3><sg>$ ^assert<vblex><pp>$ ^that<prn><tn><mf><sg>$ ^a<det><ind><sg>$ ^tax<n><sg>$ ^on<pr>$ ^foreign<adj>$ ^worker<n><pl>$ ^would<vaux><inf>$ ^reduce<vblex><inf>$ ^the<det><def><sp>$ ^number<vblex><pri><p3><sg>$ ^come<vblex><ger># in$ ^and<cnjcoo>$ “^take<vblex><ger>$ ^job<n><pl>$ ^away<adv>$” ^from<pr>$ ^american<adj>$ ^citizen<n><pl>$^.<sent>$^.<sent>$
This is the output of feeding the output above through lsx-proc :
^thus<adv>$^,<cm>$ ^prpers<prn><subj><p3><nt><sg>$ ^be<vbser><past><p3><sg>$ ^assert<vblex><pp>$ ^that<prn><tn><mf><sg>$ ^a<det><ind><sg>$ ^tax<n><sg>$ ^on<pr>$ ^foreign<adj>$ ^worker<n><pl>$ ^would<vaux><inf>$ ^reduce<vblex><inf>$ ^the<det><def><sp>$ ^number<vblex><pri><p3><sg>$ ^come<vblex><ger># in$ ^and<cnjcoo>$ “^take# away<vblex><sep><ger>$ ^job<n><pl>$” ^from<pr>$ ^american<adj>$ ^citizen<n><pl>$^.<sent>$^.<sent>$
Compilation and Usage
Make a dictionary file:
<dictionary type="separable">
<alphabet>ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz</alphabet>
<sdefs>
<sdef n="adj"/>
<sdef n="adv"/>
<sdef n="n"/>
<sdef n="sep"/>
<sdef n="vblex"/>
</sdefs>
<pardefs>
<pardef n="adj">
<e><i><w/><s n="adj"/><j/></i></e>
<e><i><w/><s n="adj"/><t/><j/></i></e>
</pardef>
<pardef n="n">
<e><i><w/><s n="n"/><t/><j/></i></e>
</pardef>
<pardef n="SN">
<e><par n="n"/></e>
<e><par n="adj"/><par n="n"/></e>
<e><par n="adj"/><par n="adj"/><par n="n"/></e>
</pardef>
<pardef n="freq-adv">
<e><i>always<s n="adv"/><j/></i></e>
<e><i>anually<s n="adv"/><j/></i></e>
<e><i>bianually<s n="adv"/><j/></i></e>
</pardef>
</pardefs>
<section id="main" type="standard">
<e lm="be late" c="llegar tarde">
<p><l>be<s n="vblex"/></l><r>be<g><b/>late</g><s n="vblex"/><s n="sep"/></r></p><i><t/><j/></i>
<par n="freq-adv"/><p><l>late<t/></l><r></r></p>
</e>
<e lm="take away" c="sacar, quitar">
<p><l>take<s n="vblex"/></l><r>take<g><b/>away</g><s n="vblex"/><s n="sep"/></r></p><i><t/><j/></i>
<par n="SN"/><p><l>away<t/></l><r></r></p>
</e>
</section>
</dictionary>
Note:
<w/>stands for one or more alphabetic symbols<t/>stands for one or more tags (multicharacter symbols).
i.e.
<e><w/>is equivalent to<t/><j/></e>any-one-or-more-chars<adj><required-anytag><optional-anytag><...><e><w/>is equivalent to<j/></e>any-one-or-more-chars<adj><optional-anytag><...>
Then compile it:
$ lsx-comp dictionary.xml english.bin main@standard 61 73
The input to lsx-proc is the output of apertium-tagger ,
$ echo '^thus<adv>$^,<cm>$ ^prpers<prn><subj><p3><nt><sg>$ ^be<vbser><past><p3><sg>$ ^assert<vblex><pp>$ ^that<prn><tn><mf><sg>$ ^a<det><ind><sg>$ ^tax<n><sg>$ ^on<pr>$ ^foreign<adj>$ ^worker<n><pl>$ ^would<vaux><inf>$ ^reduce<vblex><inf>$ ^the<det><def><sp>$ ^number<vblex><pri><p3><sg>$ ^come<vblex><ger># in$ ^and<cnjcoo>$ <b>“^take<vblex><ger>$ ^job<n><pl>$ ^away<adv>$”</b> ^from<pr>$ ^american<adj>$ ^citizen<n><pl>$^.<sent>$^.<sent>$' | lsx-proc english.bin
A larger example dictionary can be found at https://svn.code.sf.net/p/apertium/svn/branches/apertium-separable/examples/new-example.dix
Dictionary format
A paradigm is made up of:
A dictionary entry is made up of:
Preparedness of languages
| Language | entries |
|---|---|
apertium-eng |
18,563 |
Todo and bugs
- Decide whether the lsx module is part of monolingual modules, language pairs, either, or both.
- Instead of
dictionary.xmlandenglish.binand the like, we should have standardised naming conventions. Some options/proposals:eng-cat.autolsx.xml,eng-cat.autolsx.bineng-cat.autosep.lsx,eng-cat.autosep.bin- ...
