Ideas for Google Summer of Code
Revision as of 14:02, 23 April 2008 by Francis Tyers (talk | contribs)
This is the ideas page for Google Summer of Code, here you can find ideas on interesting projects that would make Apertium more useful for people and improve or expand our functionality. If you have an idea please add it below, if you think you could mentor someone in a particular area — or just have interests or ideas for that, add your name to "Interested parties" using ~~~
The page is intended as an overview of the kind of projects we have in mind. If one of them particularly piques your interest, please come and discuss with us on #apertium
on irc.freenode.net
, mail the mailing list, or draw attention to yourself in some other way.
Maybe take a look at some open bugs ?
- Difficulty = 1 (Very Hard) ... 4 (Easy)
Task | Difficulty | Description | Rationale | Requirements | Interested parties |
---|---|---|---|---|---|
Improve interoperability | 3. Medium | Either to modify Apertium to accept different formats, or to modify the other tools to accept the Apertium format, or alternatively write some kind of generic "glue" code that converts between them. | There is a lot of great free software that could be used with the Apertium engine. For example the Stuttgart FST (SFST) tools for morphological analysis/generation could be used in place of lttoolbox, |
C, C++, XML | Francis Tyers, Jimregan |
Accent and diacritic restoration |
3. Medium | Create an optional module to restore diacritics and accents on input text, and integrate it into the Apertium pipeline. | Many languages use diacritics and accents in normal writing, and Apertium is designed to use these, however in some places, especially for example. instant messaging, irc, searching in the web etc. these are often not used or untyped. This causes problems as for the engine, traduccion is not the same as traducción. | C, C++, XML, familiarity with linguistic issues | Francis Tyers |
Handling texts without accents or diacritics |
3. Medium | Modify the linguistic data in an Apertium language-pair package so that it can accept text without accents or diacritics (or partially diacriticized). The task may constitute an alternative solution to the problem in the previous task. | see: Accent and diacritic restoration | Perl or Python, familiarity with linguistic issues. | Mlforcada, Jimregan |
Porting | 3. Medium | Port Apertium to Windows and Mac OS/X complete with nice installers and all that jazz. Apertium currently compiles on Windows (see Apertium on Windows), but we'd like to see it compile with a free tool-chain (MingGW, etc.) | While we all might use GNU/Linux, there are a lot of people out there who don't, some of them use Microsoft's Windows, others use Mac OS. It would be nice for these people to be able use Apertium too. | C++, autotools, experience in programming on Windows or Mac. See bugs: #27 and #32 | Francis Tyers, Jimregan, Wynand Winterbach, Xavi Ivars |
Lexical selection | 1. Very High | Write a prototype lexical selection module for Apertium using a combination of rule-based and statistical approaches, or maybe only an statistical approach. | Lexical selection is the task of choosing a sense (meaning) for a word out of a number of possible senses (related to word sense disambiguation), when languages are close, they often share semantic ambiguity, when they are further apart they do not, so for example Spanish "estación" can be either "station", "season" or "resort" in English. Lexical selection is the task of choosing the right one. | C++, XML, good knowledge of statistics. | Jimregan, Fsanchez, Wynand Winterbach |
Interfaces | 4. Low | Create plugins or extensions for popular free software applications to include support for translation using Apertium. We'd expect at least OpenOffice and Firefox, but to start with something more easy we have half-finished plugins for Gaim and XChat that could use some love. The more the better! | Apertium currently runs as a stand alone translator. It would be great if it was integrated in other free software applications. For example so instead of copy/pasting text out of your email, you could just click a button and have it translated in place. | Depends on the application chosen, but probably C, C++, Python or Perl. | Francis Tyers, Jimregan |
Sliding window based part-of-speech tagging |
2. High | Writing a complete drop-in replacement for the Apertium part-of-speech tagger based on the sliding-window part-of-speech tagger of Sánchez-Villamil et al. (2004) [1] and Sánchez-Villamil et al. (2005) [2] (Apertium currently uses hidden Markov models). The specification file should be as similar as possible as the one used now. | The taggers described are very intuitive and may easily be turned into a compact set of finite-state rules (no need to handle probabilities after training), and may be trained in an unsupervised manner. Depending on the language, the sliding window of words to be analyzed may be configured to suit it. | C or C++, basic knowledge of the grammar of the language(s) involved | Mlforcada, Wynand Winterbach |
Linguistically-driven filtering of the bilingual phrases used to infer shallow-transfer rules | 3. Medium | Re-working apertium-transfer-training-tools to filter the set of bilingual phrases automatically obtained from a word-aligned sentence pair by using linguistic criteria. This may also involve porting it to use Unicode. | Apertium-transfer-training-tools is a cool piece of software that generates shallow-transfer rules from aligned parallel corpora. It could greatly speed up the creation of new language pairs by generating rules that would otherwise have to be written by human linguists | C++, general knowledge of GIZA++, Perl considered a plus. | Fsanchez, Wynand Winterbach |
Use of context-dependent lexicalized categories in the inference of shallow-transfer rules | 2. High | Re-working apertium-transfer-training-tools to use context-dependent lexicalized categories in the inference of shallow-transfer rules. This may also involve porting it to use Unicode. | Apertium-transfer-training-tools generates shallow-transfer rules from aligned parallel corpora. It uses an small set of lexicalized categories, categories that are usually involved in lexical changes, such as prepositions, pronouns or auxiliary verbs. Lexicalized categories differentiate from the rest of categories because their lemmas are taken into account in the generation of rules. | C++, general knowledge of GIZA++, XML. | Fsanchez, Wynand Winterbach |
Automated lexical extraction |
2. High | Writing a C++ wrapper around Markus Forsberg's Extract tool (version 2.0) as a library to allow it to be used with Apertium paradigms and TSX files as input into its paradigms and constraints. | One of the things that takes a lot of time when creating a new language pair is constructing the monodices. The extract tool can greatly reduce the time this takes by matching lemmas to paradigms based on distribution in a corpus. | Haskell, C++, XML | Francis Tyers |
Generating grammar checkers |
3. Medium | The data that come with Apertium (morphological analysers) could be used to create grammar checkers. This task would be to work on an automatic converter for Apertium formats to other popular grammar checker formats, or alternatively work on a standalone grammar checker. Maybe using something like languagetool. | Grammar checkers can be useful, for languages other than English moreso. They are one of the "must have" items of language technology. If we can re-use Apertium data for this purpose it will help both the project (by making creating new language pairs more rewarding) and the language communities (by making more useful software). | XML, whatever programming language and natural language are used for testing. | Francis Tyers, Jimregan, Wynand Winterbach |
Support for agglutinative languages |
2. High | Propose a new dictionary format that is suited to languages with agglutinative morphology and modify the morphological compiler/analyser. | Our dictionary format isn't particularly suited to agglutinative languages, and those with complex morphologies. There are many of these types of languages in the world, so it would be good to support them better. See also: Agglutination | C++, XML, knowledge of a language with these features (e.g. Finnish, Basque, Turkish, Estonian, Aymara, etc.) | Sortiz , Wynand Winterbach |
Complex multiwords | 2. High | Write a bidirectional module for specifying complex multiword units, for example dirección general and zračna luka. See Multiwords for more information. | Although in the Romance languages it is not a big problem, as soon as you start to get to languages with cases (e.g. Serbo-Croatian, Slovenian, German, etc.) the problem comes that you can't define a multiword of adj nom because the adjective has a lot of inflection. |
C, C++, XML | Francis Tyers, Jimregan |
Adopt a language pair |
4. Low | Take on an orphaned language pair, and bring it up to release quality results. What this quality will be will depend on the language pair adopted, and will need to be discussed with the prospective mentor. This will involve writing linguistic data (including morphological rules and transfer rules — which are specified in a declarative language) | Apertium has a few pairs of languages (e.g. sv-da, sh-mk, en-af, cy-en, etc...) that are orphaned, they don't have active maintainers. A lot of these pairs have a lot of work already put in, just need another few months to get them to release quality. | XML, a scripting language (Python, Perl), good knowledge of the language pair adopted. | Francis Tyers, Jimregan |
Word compounder and de-compounder |
4. Low | Write a de-compounder and compounder for Apertium. | Many languages in the world have compound words, in Europe e.g. German, Dutch, Danish, etc. These are often very low frequency or completely novel, and as such do not exist in our dictionaries. If we had some software to split these into their constituent parts we might be able to translate them, and improve accuracy on our pairs with these languages. See also bug #13, and the page Compounds | C, C++, XML | Francis Tyers, Wynand Winterbach |
Post-edition tool |
3. Medium | Make a post-edition tool to speed up revision of Apertium translations. It would likely include at least support for spelling and grammar checking, along with defining user-specified rules for fixing translations (search and replace, etc.) | After translating with Apertium revision work has to be done to consider a translation as an "adequate" translation. An intelligent post-edition environment will help doing this task. In this environment some typical mistakes in the translation process that can be automatically detected (for example unknown words and homographs) could be highlighted to be taken in consideration while doing post-edition. Some typical mistakes could also be defined to advise the post-editor to check them. | XML, PHP, Python, C, C++, whichever programming language. | Sortiz, Jimregan |
Lexical insertion tool |
3. Medium | Improving the current web based dictionary application to insert new word pairs into the Apertium dictionaries. This would involve both improving the functionality, and efficiency of the software. | Currently people have to edit XML in order to add words to the dictionaries. We have a web application, written in Python that does a lot of this work, but it still lacks some functionality, for example multiwords, and complete support for the new dictionary format. What is more it is quite slow and memory intensive. | Python | Francis Tyers |
Generating spell checkers |
4. Low | The data that come with Apertium (morphological analysers) could be used to create spell checkers. This task would be to work on an automatic converter for Apertium formats to other popular spell checker formats. Maybe using something ispell, myspell, hunspell, youspell, etc. | Spell checkers can be useful especially before translating. They are one of the basic items of language technology. If we can re-use Apertium data for this purpose it will help both the project (by making creating new language pairs more rewarding) and the language communities (by making more useful software). This will be particulary useful for minority languages having an Apertium translator but not having a free spell checker, and also to use spell checking tools as a controlled language tool. | XML, whatever programming language and natural language are used for testing. | Sortiz |
Detect 'hidden' unknown words | 3. Medium | The part-of-speech tagger of Apertium can be modified to work out the likelihood of each 'tag' in a certain context, this can be used to detect missing entries in the dictionary. | Apertium dictionaries may have incomplete entries, that is, surface forms (lexical units as they appear in running texts) for which the dictionary does not provided all the possible lexical forms (consisting of lemma, part-of-speech and morphological inflection information). As those surface form for which there is at least one lexical form cannot be considered unknown words, it is difficult to know whether all lexical forms for a given surface form have been included in the dictionaries or not. This feature will detect 'possible' missing lexical forms for those surface forms in the dictionaries. | C++ if you plan to modify the part-of-speech tagger; whatever if rewriting it from scratch. | Sortiz, Fsanchez |
Format filters | 4. Low | Making apertium capable of dealing with more different formats, for the minimum: files marked up with LaTeX and Wiki. | Apertium can currently deal with texts in plain-text, RTF, HTML and ODT formats by means of a format definition file. It should be easy to use the same language to define filters for other formats. | Apertium format definition language and/or scripting languages. | Mlforcada Francis Tyers, Jimregan |
Part of speech detection for unknown words | 3. Medium | Allow unknown words to be processed by transfer rules | At the moment, unknown words are ignored by transfer rules; however, the part-of-speech tagger could be modified to add likely tags for unknown words, which could then be used in transfer, which would improve sentence level translation. In addition, certain factors of the morphology of the unknown word could be taken into account (e.g., the suffix '-ing' in an unknown English word implies a verb) to increase the 'confidence' in an analysis. | C++ preferable | Jimregan |
Notes
Further reading
- Accent and diacritic restoration
- Simard, Michel (1998). "Automatic Insertion of Accents in French Texts". Proceedings of EMNLP-3. Granada, Spain.
- Rada F. Mihalcea. (2002). "Diacritics Restoration: Learning from Letters versus Learning from Words". Lecture Notes in Computer Science 2276/2002 pp. 96--113
- G. De Pauw, P. W. Wagacha; G.M. de Schryver (2007) "Automatic diacritic restoration for resource-scarce languages". Proceedings of Text, Speech and Dialogue, Tenth International Conference. pp. 170--179
- P.W. Wagacha; G. De Pauw; P.W. Githinji (2006) "A grapheme-based approach to accent restoration in Gĩkũyũ". Proceedings of the Fifth International Conference on Language Resources and Evaluation
- D. Yarowsky (1994) "A Comparison Of Corpus-Based Techniques For Restoring Accents In Spanish And French Text". Proceedings, 2nd annual workshop on very large corpora. pp. 19--32
- Lexical selection
- Ide, N. and Véronis, J. (1998) "Word Sense Disambiguation: The State of the Art". Computational Linguistics 24(1)
- Sliding-window based part-of-speech tagging
- Wikipedia: Desambiguación léxica basada en ventana deslizante (in Spanish)
- Sanchez-Villamil, E., Forcada, M. L., and Carrasco, R. C. (2005). "Unsupervised training of a finite-state sliding-window part-of-speech tagger". Lecture Notes in Computer Science / Lecture Notes in Artificial Intelligence, vol. 3230, p. 454-463
- Automated lexical extraction
- M. Forsberg H. Hammarström A. Ranta. "Morphological Lexicon Extraction from Raw Text Data". FinTAL 2006, LNAI 4139, pp. 488--499.
- Support for agglutinative languages
- Beesley, K. R and Karttunen, L. (2000) "Finite-State Non-Concatenative Morphotactics". SIGPHON-2000, Proceedings of the Fifth Workshop of the ACLSpecial Interest Group in Computational Phonology, pp. 1--12,
- Transfer rule learning
- Sánchez-Martínez, F. and Forcada, M.L. (2007) "Automatic induction of shallow-transfer rules for open-source machine translation", in Proceedings of TMI 2007, pp.181-190 (paper, poster)
- Compounding and de-compounding
- Koehn, P. and Knight, K. (2003) "Empirical Methods for Compound Splitting". 11th Conference of the European Chapter of the Association for Computational Linguistics, (EACL2003).
- Brown, R. (2002) "Corpus-Driven Splitting of Compound Words". TMI 2002
- Moa, H. (2005) "Compounds and other oddities in machine translation". Proceedings of the 15th NODALIDA conference, Joensuu 2005.