Bulgarian Word Net Svetla Koeva Institute for Bulgarian

Bulgarian Word. Net Svetla Koeva Institute for Bulgarian Language Bulgarian Academy of Sciences Second Wordnet Conference, Brno

Bulgarian Word. Net n n n The Bulgarian Word. Net (Bul. Net) has been under development for two years within the framework of the Balka. Net project. The Balka. Net project (Multilingual Semantic Network for the Balkan Languages), aims to develop a multilingual resource representing semantic relationships in five Balkan languages (Bulgarian, Greek, Serbian, Romanian and Turkish). Each set of synonymous words in a given language is linked to the closest set in the Princeton Word. Net 2. 0 via its ID number. 9/29/2020 Second Wordnet Conference, Brno

n n n Bul. Net – DCMB team The partners from Bulgarian site are Bulgarian Academy of Sciences and Plovdiv University. The Bulgarian Word. Net is being developed by the Department of Computer Modeling of Bulgarian Language within the Institute for Bulgarian language Bulgarian Academy of Sciences. http: //ibl. bas. bg/departments_en 6. htm The DCMB Bul. Net team consists of small group of researchers – linguists, computational linguists, logicians and mathematicians. 9/29/2020 Second Wordnet Conference, Brno

Bul. Net – current state n n The Bulgarian Word. Net models nouns, verbs, and adjectives, and contains already 17 291 word senses (towards 20. 01. 2003), where 31 164 literals have been included (the ratio is 1. 8). The distribution of synsets into parts of speech: § Nouns – 12 223 synsets § Verbs – 3 408 synsets § Adjectives – 1 656 synsets § Adverbs – 4 synsets 9/29/2020 Second Wordnet Conference, Brno

Bul. Net – current state Hypernym – 14 Near_antonym – 999 1371 Holo_part – 989 Holo_member – 798 Derived – 778 Verb_group 710 Also_see – 187 Subevent – 149 Be_in_state 386 Cause – 105 – Holo_portion – Similar_to – 49 63 9/29/2020 – Second Wordnet Conference, Brno

Completeness n n Presence of all members from the chosen up to now Base Concepts within the framework of the Balka. Net project. n Base Concepts 1 (1218 members) n BC 2 (3471 members) n BC 3 (4855 members) Lack of any "dangling relations" Lack of any “gaps” Presence of an appropriate interpretation definition for each synset 9/29/2020 Second Wordnet Conference, Brno

Consistency n n n The are no duplicated literals in a given synset. There are no identical or almost identical glosses of different synsets. There are no literals that coincide with their glosses. There are no duplicated relations between two synsets. Every difference in relations according to EWN is language specific and linguistically grounded. There are no hypernym cycles, as well as any relation loops inside Bul. Net. 9/29/2020 Second Wordnet Conference, Brno

Main achievements n n n Theoretical linguistic work n Validation tests n Dependencies between relations n Combination of Bulgarian language resources Descriptive logic Design and development of tools n Word. Net Explorer n Word. Net Validator 9/29/2020 Second Wordnet Conference, Brno

Validation tests n n Our approach to validation of Word. Nets includes three separate levels: n Checking the syntax of the XML files n Completeness checking of Word. Nets n Checking for consistency in defining the semantic relations and glosses. Every level is distinguished with: n Different degrees of complexity and significance n Different possibilities for automatic data correction 9/29/2020 Second Wordnet Conference, Brno

Validation tests The lowest level, which is also the easiest for processing and correction, is XML fails syntax. n In the following cases automatic checking as well as automatic data correction is possible: n Facultative empty tags n Duplicated literals in a synset n Sense numbers n 9/29/2020 Second Wordnet Conference, Brno

Validation tests n In other cases where automatic correction is possible manual confirmation of replacements is necessary: n Accepted ID standard n Missing values of the obligatory tags n Corespondence of BCS tags n At least one literal in a synset 9/29/2020 Second Wordnet Conference, Brno

Validation tests n In some cases only validation is possible: n No duplicated <ID> numbers n No duplicated relations between two synsets n No “gaps” n No “dangling relations” n No loops 9/29/2020 Second Wordnet Conference, Brno

Relations’ dependencies n n n Description of the dependencies between the relations: Hyponyms of two antonyms (nouns) should also be antonyms (woman – man; female actor – actor) Antonyms (nouns) should have equivalent holo_parts: woman arm, head; man – arm, head. Hyponym should have the same mero_parts (for concrete nouns} as its hypernym (man – head, arm, … ; woman – head, arm, . . ) Collective nouns that are holo/mero_members should share the same hypernym, not necessarily the immediate one (football team is an organization, as well as football league) Nouns that are holo/mero_portions should share the same hypernym, not necessarily the immediate one (coffee – substance; caffeine - substance) 9/29/2020 Second Wordnet Conference, Brno

Combining language resources n n Three large Bulgarian resources: n Bul. Net n Bulgarian Syntax Dictionary – encoding the arguments of the verbs and their semantic features n Bulgarian Grammatical Dictionary – encoding over 83 000 lemmas are their corresponding word forms Mutual supplement n Expansion of the resources n Validation of the resources n Uniform grammatical characteristics 9/29/2020 Second Wordnet Conference, Brno

Word. Net logic n n The DCMB team developed a uniform, efficient and powerful utility system for querying and exploring of Word. Net – Word. Net logic. n Tailored for the Word. Net developers needs n Powerful enough for expressing complex statements and queries n Fully decidable The formal background consists of Word. Net Structure, WN Language, WN Semantics, WN Logic and WN Logic theorems. Tinko Tinchev, Stoyan Mihov, Svetla Koeva, Angel Genov: Logic for Word. Net, Annual Journal of Sofia University, 2003 9/29/2020 Second Wordnet Conference, Brno

n n n Word. Net Validator The Word. Net Validator (WNV) is a Web-based system for validation (and correction) of Word. Nets completeness and consistency The Word. Net Validator has the following main functions: automatic correction of xml syntax, validation of Word. Net completeness and consistency, search for a given synset and visualization of semantic trees. The Word. Net Validator can be used for practical work during constructing monolingual Word. Nets of Balkan languages as well as for evaluation of the completeness and consistency of different Word. Net. 9/29/2020 Second Wordnet Conference, Brno

9/29/2020 Second Wordnet Conference, Brno

9/29/2020 Second Wordnet Conference, Brno

n Future 9/29/2020 directions Second Wordnet Conference, Brno