Editing Semantic network

{{distinguish|semantic neural network}}
{{short description|Knowledge base that represents semantic relations between concepts in a network}}
{{Use dmy dates|date=January 2021}}
[[Image:Semantic Net.svg|thumb|upright|Example of a semantic network]]
{{Network science}}
{{InfoMaps}}

A '''semantic network''', or '''frame network''' is a [[knowledge base]] that represents [[Semantics|semantic]] relations between [[concept]]s in a network. This is often used as a form of [[Knowledge representation and reasoning|knowledge representation]]. It is a [[directed graph|directed]] or [[undirected graph]] consisting of [[vertex (graph theory)|vertices]], which represent [[concept]]s, and [[graph theory|edges]], which represent [[semantic relationship|semantic relations]] between [[Concept|concepts]],<ref name = 'Sowa'/> mapping or connecting [[semantic field]]s. A semantic network may be instantiated as, for example, a [[graph database]] or a [[concept map]]. Typical standardized semantic networks are expressed as [[semantic triple]]s.

Semantic networks are used in [[neurolinguistics]] and [[natural language processing]] applications such as [[semantic parsing]]<ref>Poon, Hoifung, and Pedro Domingos. "[https://aclanthology.info/pdf/D/D09/D09-1001.pdf Unsupervised semantic parsing] {{Webarchive|url=https://web.archive.org/web/20190207015717/https://aclanthology.info/pdf/D/D09/D09-1001.pdf |date=7 February 2019 }}." Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing: Volume 1-Volume 1. Association for Computational Linguistics, 2009.</ref> and [[word-sense disambiguation]].<ref>Sussna, Michael. "[https://sites.ualberta.ca/~golmoham/SW/ontology%20based%20similarity/Word%20sense%20disambiguation%20for%20free-text%20indexing%20using%20a%20massive%20semantic%20network.pdf Word sense disambiguation for free-text indexing using a massive semantic network] {{Webarchive|url=https://web.archive.org/web/20210921093053/https://sites.ualberta.ca/~golmoham/SW/ontology%20based%20similarity/Word%20sense%20disambiguation%20for%20free-text%20indexing%20using%20a%20massive%20semantic%20network.pdf |date=21 September 2021 }}." Proceedings of the second international conference on Information and knowledge management. ACM, 1993.</ref> Semantic networks can also be used as a method to analyze large texts and identify the main themes and topics (e.g., of [[social media]] posts), to reveal biases (e.g., in news coverage), or even to map an entire research field.<ref>{{cite book |last1=Segev |first1=Elad |title=Semantic Network Analysis in Social Sciences |date=2022 |publisher=Routledge |location=London |isbn=9780367636524 |url=https://www.routledge.com/Semantic-Network-Analysis-in-Social-Sciences/Segev/p/book/9780367636524 |access-date=5 December 2021 |archive-date=5 December 2021 |archive-url=https://web.archive.org/web/20211205140726/https://www.routledge.com/Semantic-Network-Analysis-in-Social-Sciences/Segev/p/book/9780367636524 |url-status=live }}</ref>

== History ==
Examples of the use of semantic networks in [[logic]], [[Directed acyclic graph|directed acyclic graphs]] as a mnemonic tool, dates back centuries, the earliest documented use being the Greek philosopher [[Porphyry (philosopher)|Porphyry]]'s commentary on [[Aristotle]]'s [[Categories (Aristotle)|categories]] in the third century AD.

In [[History of computing|computing history]], "Semantic Nets" for the [[propositional calculus]] were first [[Implementation|implemented]] for [[computers]] by [[Richard H. Richens]] of the [[Cambridge Language Research Unit]] in 1956 as an "[[Pivot language|interlingua]]" for [[machine translation]] of [[natural language]]s,<ref>{{cite book |editor1-last=Lehmann |editor1-first=Fritz |editor2-last=Rodin |editor2-first=Ervin Y. |date=1992 |title=Semantic networks in artificial intelligence |series=International series in modern applied mathematics and computer science |volume=24 |location=Oxford; New York |publisher=[[Pergamon Press]] |isbn=978-0080420127 |oclc=26391254 |page=6 |quote=The first semantic network for computers was Nude, created by R. H. Richens of the Cambridge Language Research Unit in 1956 as an interlingua for machine translation of natural languages.}}</ref> although the importance of this work and the Cambridge Language Research Unit was only belatedly realized.

Semantic networks were also independently implemented by Robert F. Simmons<ref name='Simmons1963'>{{cite journal | title=Synthetic language behavior | journal=Data Processing Management | year=1963 | last=Robert F. Simmons |volume=5 |issue=12 |pages=11–18}}</ref> and Sheldon Klein, using the [[First-order logic|first-order predicate calculus]] as a base, after being inspired by a demonstration of [[Victor Yngve]]. The "line of research was originated by the first President of the [[Association for Computational Linguistics]], Victor Yngve, who in 1960 had published descriptions of [[Algorithm|algorithms]] for using a [[phrase structure grammar]] to generate syntactically well-formed nonsense sentences. Sheldon Klein and I about 1962–1964 were fascinated by the technique and generalized it to a method for controlling the sense of what was generated by respecting the semantic dependencies of words as they occurred in text."<ref>Simmons, [https://www.aclweb.org/anthology/P82-1022 "Themes From 1972"] {{Webarchive|url=https://web.archive.org/web/20190901171738/https://www.aclweb.org/anthology/P82-1022 |date=1 September 2019 }}, ''ACL Anthology'', 1982</ref> Other researchers, most notably [[M. Ross Quillian]]<ref name='Quillian1963'>Quillian, R. A notation for representing conceptual information: An application to semantics and mechanical English para- phrasing. SP-1395, System Development Corporation, Santa Monica, 1963.</ref> and others at [[System Development Corporation]] helped contribute to their work in the early 1960s as part of the SYNTHEX project. It's these publications at System Development Corporation that most modern derivatives of the term "semantic network" cite as their background. Later prominent works were done by [[Allan M. Collins]] and Quillian (e.g., Collins and Quillian;<ref name='Collins1969'>{{cite journal | title=Retrieval time from semantic memory | journal=Journal of Verbal Learning and Verbal Behavior | year=1969 | last1=Allan M. Collins |author2= M. R. Quillian |volume=8 |issue=2 |pages=240–247 |doi=10.1016/S0022-5371(69)80069-1  }}</ref><ref name='Collins1970'>{{cite journal |title=Does category size affect categorization time? |journal=Journal of Verbal Learning and Verbal Behavior |year=1970 |last=Allan M. Collins|author2=M. Ross Quillian  |volume=9 |issue=4 |pages=432–438 |doi=10.1016/S0022-5371(70)80084-6 }}</ref> Collins and Loftus<ref name='Collins1975'>{{cite journal |title=A spreading-activation theory of semantic processing |journal=Psychological Review |year=1975 |last=Allan M. Collins |author2=Elizabeth F. Loftus |volume=82 |issue=6 |doi=10.1037/0033-295x.82.6.407 |pages=407–428 |s2cid=14217893 }}</ref> Quillian<ref>Quillian, M. R. (1967). Word concepts: A theory and simulation of some basic semantic capabilities. Behavioral Science, 12(5), 410–430.</ref><ref>Quillian, M. R. (1968). Semantic memory. Semantic information processing, 227–270.</ref><ref>{{cite journal | last1 = Quillian | first1 = M. R. | year = 1969 | title = The teachable language comprehender: a simulation program and theory of language | journal = Communications of the ACM | volume = 12 | issue = 8| pages = 459–476 | doi=10.1145/363196.363214| s2cid = 15304609 | doi-access = free }}</ref><ref>Quillian, R. Semantic Memory. Unpublished doctoral dissertation, Carnegie Institute of Technology, 1966.</ref>). Still later in 2006, Hermann Helbig fully described [[MultiNet]].<ref>{{cite book | last1 = Helbig | first1 = H. | year = 2006 | title = Knowledge Representation and the Semantics of Natural Language | url = http://14.139.206.50:8080/jspui/bitstream/1/2412/1/Helbig,%20Hermann%20-%20Knowledge%20Representation%20and%20the%20Semantics%20of%20Natural%20Language.pdf | isbn = 978-3540244615 | access-date = 19 March 2018 | archive-date = 30 August 2017 | archive-url = https://web.archive.org/web/20170830103805/http://14.139.206.50:8080/jspui/bitstream/1/2412/1/Helbig,%20Hermann%20-%20Knowledge%20Representation%20and%20the%20Semantics%20of%20Natural%20Language.pdf | url-status = live }}</ref>

In the late 1980s, two universities in the [[Netherlands]], [[University of Groningen|Groningen]] and [[University of Twente|Twente]], jointly began a project called ''Knowledge Graphs'', which are semantic networks but with the added constraint that edges are restricted to be from a limited set of possible relations, to facilitate [[Graph algebra|algebras on the graph]].<ref>{{cite book
|editor-last=Van de Riet
|editor-first=R. P.
|title=Linguistic Instruments in Knowledge Engineering 
|author-last=James
|author-first=P.
|chapter=Knowledge Graphs
|date=1992
|chapter-url=http://www.stokman.org/artikel/92Jame.KnowGraphs.LIKE.pdf
|archive-url=https://web.archive.org/web/20160811111559if_/http://stokman.org/artikel/92Jame.KnowGraphs.LIKE.pdf
|archive-date=2016-08-11
|publisher=Elsevier Science Publishers
|page=98
|isbn=978-0444883940
}}
Note from the cited chapter: ''The author's name P. James is a pseudonym for the group of researchers that took part in or are still taking part in the project "Knowledge Graphs", that was started as a joint project of the universities of Groningen and Twente in the Netherlands. Alstein, de By, Edens, and Miltenburg were students that contributed to the project. In the course of the project, members of the project group have been R.R. Bakker, H. van den Berg, C. Hoede, M.A.W. Houtsma, H.J. Smit, F.N. Stokman, P.H. de Vries, and M. Willems.''
<!-- The 'cite book' template has no 'note' field. Placing the above note here, outside the template but inside the 'ref' tags works. Noting that the author's name is a pseudonym seems relevant; and we might as well quote the remainder of the paragraph, which contains relevant names. Down here in the footnotes it'll be in nobody's way.-->
</ref> In the subsequent decades, the distinction between semantic networks and [[knowledge graph]]s was blurred.<ref>{{cite conference |url=https://books.google.com/books?id=15PDCgAAQBAJ&pg=PA444 |title=Path-Based Semantic Relatedness on Linked Data and Its Use to Word and Entity Disambiguation |last1=Hulpus |first1=Ioana |last2=Prangnawarat |first2=Narumol |date=2015 |publisher=Springer International Publishing |book-title=The Semantic Web – ISWC 2015: 14th International Semantic Web Conference, Bethlehem, PA, USA, October 11–15, 2015, Proceedings, Part 1 |pages=444 |isbn=9783319250076 |conference=[[International Semantic Web Conference]] 2015}}</ref><ref>{{cite web |url=https://www.authorea.com/users/6341/articles/107281 |title=What is a Knowledge Graph? |last1=McCusker |first1=James P. |last2=Chastain |first2=Katherine |date=April 2016 |website=authorea.com |access-date=15 June 2016 |quote="usage [of the term 'knowledge graph'] has evolved" |archive-date=17 June 2021 |archive-url=https://web.archive.org/web/20210617061900/https://www.authorea.com/users/6341/articles/107281 |url-status=live }}</ref> In 2012, [[Google]] gave their knowledge graph the name [[Knowledge Graph]].

The semantic link network was systematically studied as a [[Semantic social network|semantic social networking]] method. Its basic model consists of semantic nodes, semantic links between nodes, and a semantic space that defines the semantics of nodes and links and reasoning rules on semantic links.  The systematic theory and model was published in 2004.<ref>H. Zhuge, Knowledge Grid, World Scientific Publishing Co. 2004.</ref> This research direction can trace to the definition of inheritance rules for efficient model retrieval in 1998<ref>H. Zhuge, Inheritance rules for flexible model retrieval. Decision Support Systems 22(4)(1998)379–390</ref> and the Active Document Framework ADF.<ref>H. Zhuge, Active e-document framework ADF: model and tool. Information & Management 41(1): 87–97 (2003)</ref> Since 2003, research has developed toward social semantic networking.<ref>H.Zhuge and L.Zheng, Ranking Semantic-linked Network, WWW 2003</ref> This work is a systematic innovation at the age of the [[World Wide Web]] and global social networking rather than an application or simple extension of the Semantic Net (Network). Its purpose and scope are different from that of the Semantic Net (or network).<ref>H.Zhuge, The Semantic Link Network, in The Knowledge Grid: Toward Cyber-Physical Society, World Scientific Publishing Co. 2012.</ref> The rules for reasoning and evolution and automatic discovery of implicit links play an important role in the Semantic Link Network.<ref>H. Zhuge, L. Zheng, N. Zhang and X. Li, An automatic semantic relationships discovery approach. WWW 2004: 278–279.</ref><ref>H. Zhuge, Communities and Emerging Semantics in Semantic Link Network: Discovery and Learning, IEEE Transactions on Knowledge and Data Engineering, 21(6)(2009)785–799.</ref> Recently it has been developed to support Cyber-Physical-Social Intelligence.<ref>H.Zhuge, Semantic linking through spaces for cyber-physical-socio intelligence: A methodology, Artificial Intelligence, 175(2011)988–1019.</ref> It was used for creating a general summarization method.<ref>H. Zhuge, Multi-Dimensional Summarization in Cyber-Physical Society, Morgan Kaufmann, 2016.</ref> The self-organised Semantic Link Network was integrated with a multi-dimensional category space to form a semantic space to support advanced applications with multi-dimensional abstractions and self-organised semantic links<ref>H. Zhuge, The Web Resource Space Model, Springer, 2008.</ref><ref>H.Zhuge and Y.Xing, Probabilistic Resource Space Model for Managing Resources in Cyber-Physical Society, IEEE Transactions on Service Computing, 5(3)(2012)404–421.</ref> It has been verified that Semantic Link Network play an important role in understanding and representation through [[Automatic summarization|text summarisation]] applications.<ref>X. Sun and H. Zhuge, Summarization of Scientific Paper through Reinforcement Ranking on Semantic Link Network, IEEE ACCESS, 2018, {{doi|10.1109/ACCESS.2018.2856530}}.</ref><ref>M.Cao, X.Sun and H. Zhuge, The contribution of cause-effect link to representing the core of scientific paper—The role of Semantic Link Network, PLOS ONE, 2018, {{doi|10.1371/journal.pone.0199303}}.</ref> Semantic Link Network has been extended from cyberspace to cyber-physical-social space. Competition relation and symbiosis relation as well as their roles in evolving society were studied in the emerging topic: Cyber-Physical-Social Intelligence<ref>H. Zhuge, Cyber-Physical-Social Intelligence on Human-Machine-Nature Symbiosis, Springer, 2020.</ref>

More specialized forms of semantic networks has been created for specific use. For example, in 2008, Fawsy Bendeck's PhD thesis formalized the [[semantic similarity network|Semantic Similarity Network]] (SSN) that contains specialized relationships and propagation algorithms to simplify the [[semantic similarity]] representation and calculations.<ref>{{cite book |last=Bendeck |first=Fawsy |date=2008 |title=WSM-P workflow semantic matching platform |location=München |publisher=Verl. Dr. Hut |isbn=9783899638547 |oclc=501314022}}</ref>

== Basics of semantic networks ==
A semantic network is used when one has knowledge that is best understood as a set of concepts that are related to one another.

Most semantic networks are cognitively based. They consist of arcs (spokes) and nodes (hubs) which can be organized into a taxonomic hierarchy. Different semantic networks can also be connected by bridge nodes. Semantic networks contributed to the ideas of [[spreading activation]], [[Inheritance (object-oriented programming)|inheritance]], and nodes as proto-objects.

One process of constructing semantic networks, known also as [[co-occurrence network|co-occurrence networks]], includes identifying keywords in the text, calculating the frequencies of co-occurrences, and analyzing the networks to find central words and clusters of themes in the network.<ref>{{cite book |last1=Segev |first1=Elad |title=Semantic Network Analysis in Social Sciences |date=2022 |publisher=Routledge |location=London |isbn=9780367636524 |url=https://www.routledge.com/Semantic-Network-Analysis-in-Social-Sciences/Segev/p/book/9780367636524 |access-date=5 December 2021 |archive-date=5 December 2021 |archive-url=https://web.archive.org/web/20211205140726/https://www.routledge.com/Semantic-Network-Analysis-in-Social-Sciences/Segev/p/book/9780367636524 |url-status=live }}</ref>

==In linguistics==
In the field of [[linguistics]], semantic networks represent how the human mind handles associated concepts. Typically, concepts in a semantic network can have one of two different relationships: either semantic or associative. 

If semantic in relation, the two concepts are linked by any of the following semantic relationships: [[synonymy]], [[antonymy]], [[hypernymy]], [[hyponymy]], [[holonymy]], [[meronymy]], [[metonymy]], or [[polysemy]]. These are not the only semantic relationships, but some of the most common. 

If associative in relation, the two concepts are linked based on their frequency to occur together. These associations are accidental, meaning that nothing about their individual meanings requires them to be associated with one another, only that they typically are. Examples of this would be pig and farm, pig and trough, or pig and mud. While nothing about the meaning of pig forces it to be associated with farms, as pigs can be wild, the fact that pigs are so frequently found on farms creates an accidental associated relationship. These thematic relationships are common within semantic networks and are notable results in [[Free association (psychology)|free association]] tests.

As the initial word is given, activation of the most closely related concepts begin, spreading outward to the lesser associated concepts. An example of this would be the initial word pig prompting mammal, then animal, and then breathes. This example shows that taxonomic relationships are inherent within semantic networks. The most closely related concepts typically share [[semantic features]], which are determinants of semantic similarity scores. Words with higher similarity scores are more closely related, thus have higher probability of being a close word in the semantic network.

These relationships can be suggested into the brain through [[Priming (psychology)|priming]], where previous examples of the same relationship are shown before the target word is shown. The effect of priming on a semantic network linking can be seen through the speed of the reaction time to the word. Priming can help to reveal the structure of a semantic network and which words are most closely associated with the original word.

Disruption of a semantic network can lead to a semantic deficit (not to be confused with as [[semantic dementia]]).

===In the brain===
There exists physical manifestation of semantic relationships in the brain as well. Category-specific semantic circuits show that words belonging to different categories are processed in circuits differently located throughout the brain. For example, the semantic circuits for a word associated with the face or mouth (such as lick) is located in a different place of the brain than a word associated with the leg or foot (such as kick). This is a primary result of a 2013 study published by [[Friedemann Pulvermüller]]{{Citation needed|date=July 2024}}. These semantic circuits are directly tied to their sensorimotor areas of the brain. This is known as embodied semantics, a subtopic of [[embodied language processing]].

If brain damage occurs, the normal processing of semantic networks could be disrupted, leading to preference into what kind of relationships dominate the semantic network in the mind.

== Examples ==

=== In Lisp ===
The following code shows an example of a semantic network in the [[Lisp (programming language)|Lisp programming language]] using an [[association list]].
<syntaxhighlight lang="lisp">
(setq *database*
'((canary  (is-a bird)
           (color yellow)
           (size small))
  (penguin (is-a bird)
           (movement swim))
  (bird    (is-a vertebrate)
           (has-part wings)
           (reproduction egg-laying))))
</syntaxhighlight>

To extract all the information about the "canary" type, one would use the <code>assoc</code> function with a key of "canary".<ref>{{cite web|last=Swigger|first=Kathleen|title=Semantic.ppt|url=http://zeus.csci.unt.edu/swigger/csci3210/semantic.ppt|access-date=23 March 2011|archive-date=10 May 2013|archive-url=https://web.archive.org/web/20130510072002/http://zeus.csci.unt.edu/swigger/csci3210/semantic.ppt|url-status=dead}}</ref>

=== WordNet ===
{{Main|WordNet}}
An example of a semantic network is [[WordNet]], a [[lexicon|lexical]] database of [[English language|English]]. It groups English words into sets of synonyms called [[synsets]], provides short, general definitions, and records the various semantic relations between these synonym sets. Some of the most common semantic relations defined are [[meronymy]] (A is a meronym of B if A is part of B), [[holonymy]] (B is a holonym of A if B contains A), [[hyponym]]y (or [[troponymy]]) (A is subordinate of B; A is kind of B), [[hypernym]]y (A is superordinate of B), [[synonym]]y (A denotes the same as B) and [[antonym]]y (A denotes the opposite of B).

WordNet properties have been studied from a [[Graph theory|network theory]] perspective and compared to other semantic networks created from [[Roget's Thesaurus]] and [[word association]] tasks.  From this perspective the three of them are a [[Small-world network|small world structure]].<ref name=Steyvers2005>{{cite journal
 | author = Steyvers, M.
 |author2=Tenenbaum, J.B.
  | year = 2005
 | title = The Large-Scale Structure of Semantic Networks: Statistical Analyses and a Model of Semantic Growth
 | journal = Cognitive Science
 | volume = 29
 | issue = 1
 | pages = 41–78
 | doi = 10.1207/s15516709cog2901_3
|pmid=21702767
 | arxiv = cond-mat/0110012
 |s2cid=6000627
 }}</ref>

=== Other examples ===
It is also possible to represent logical descriptions using semantic networks such as the [[existential graph]]s of [[Charles Sanders Peirce]] or the related [[conceptual graph]]s of [[John F. Sowa]].<ref name='Sowa'>{{cite encyclopedia
|author=John F. Sowa
|editor=Stuart C Shapiro
|encyclopedia=Encyclopedia of Artificial Intelligence
|title=Semantic Networks
|url=http://www.jfsowa.com/pubs/semnet.htm
|access-date=2008-04-29
|year=1987
|author-link=John F. Sowa
|archive-date=8 October 2018
|archive-url=https://web.archive.org/web/20181008185537/http://www.jfsowa.com/pubs/semnet.htm
|url-status=live
}}</ref> These have expressive power equal to or exceeding standard [[first-order predicate calculus|first-order predicate logic]].  Unlike WordNet or other lexical or browsing networks, semantic networks using these representations can be used for reliable automated logical deduction.  Some automated reasoners exploit the graph-theoretic features of the networks during processing.

Other examples of semantic networks are [[Gellish]] models. [[Gellish English]] with its [[Gellish English dictionary]], is a [[formal language]] that is defined as a network of relations between concepts and names of concepts. Gellish English is a formal subset of natural English, just as Gellish Dutch is a formal subset of Dutch, whereas multiple languages share the same concepts. Other Gellish networks consist of knowledge models and information models that are expressed in the Gellish language. A Gellish network is a network of (binary) relations between things. Each relation in the network is an expression of a fact that is classified by a relation type. Each relation type itself is a concept that is defined in the Gellish language dictionary. Each related thing is either a concept or an individual thing that is classified by a concept. The definitions of concepts are created in the form of definition models (definition networks) that together form a Gellish Dictionary. A Gellish network can be documented in a Gellish database and is computer interpretable.

[[SciCrunch]] is a collaboratively edited knowledge base for scientific resources. It provides unambiguous identifiers (Research Resource IDentifiers or RRIDs) for software, lab tools etc. and it also provides options to create links between RRIDs and from communities.

Another example of semantic networks, based on [[category theory]], is [[olog]]s. Here each type is an object, representing a set of things, and each arrow is a morphism, representing a function. [[Commutative diagrams]] also are prescribed to constrain the semantics.

In the social sciences people sometimes use the term semantic network to refer to [[co-occurrence networks]].<ref name='Atteveldt'>{{cite book |author=Wouter Van Atteveldt |title=Semantic Network Analysis: Techniques for Extracting, Representing, and Querying Media Content |publisher=BookSurge Publishing |url=http://vanatteveldt.com/wp-content/uploads/vanatteveldt_semanticnetworkanalysis.pdf |year=2008 |access-date=28 November 2021 |archive-date=28 November 2021 |archive-url=https://web.archive.org/web/20211128205957/http://vanatteveldt.com/wp-content/uploads/vanatteveldt_semanticnetworkanalysis.pdf |url-status=live }}</ref><ref>{{cite journal |last1=Segev |first1=Elad |title=Textual network analysis: Detecting prevailing themes and biases in international news and social media |journal=Sociology Compass |date=2020 |volume=14 |issue=4 |doi=10.1111/soc4.12779 |s2cid=212890998 |url=https://onlinelibrary.wiley.com/doi/full/10.1111/soc4.12779 |access-date=5 December 2021 |archive-date=5 December 2021 |archive-url=https://web.archive.org/web/20211205140727/https://onlinelibrary.wiley.com/doi/full/10.1111/soc4.12779 |url-status=live |url-access=subscription }}</ref> The basic idea is that words that co-occur in a unit of text, e.g. a sentence, are semantically related to one another. Ties based on co-occurrence can then be used to construct semantic networks. This process includes identifying keywords in the text, constructing co-occurrence networks, and analyzing the networks to find central words and clusters of themes in the network. It is a particularly useful method to analyze large text and [[big data]].<ref>{{cite book |last1=Segev |first1=Elad |title=Semantic Network Analysis in Social Sciences |date=2022 |publisher=Routledge |location=London |isbn=9780367636524 |url=https://www.routledge.com/Semantic-Network-Analysis-in-Social-Sciences/Segev/p/book/9780367636524 |access-date=5 December 2021 |archive-date=5 December 2021 |archive-url=https://web.archive.org/web/20211205140726/https://www.routledge.com/Semantic-Network-Analysis-in-Social-Sciences/Segev/p/book/9780367636524 |url-status=live }}</ref>

== Software tools ==
There are also elaborate types of semantic networks connected with corresponding sets of software tools used for [[Lexicon|lexical]] [[knowledge engineering]], like the Semantic Network Processing System ([[SNePS]]) of Stuart C. Shapiro<ref>{{cite web| url = http://www.cse.buffalo.edu/~shapiro/| title = Stuart C. Shapiro| access-date = 29 August 2006| archive-date = 27 August 2006| archive-url = https://web.archive.org/web/20060827101751/http://www.cse.buffalo.edu/~shapiro/| url-status = live}}</ref> or the [[MultiNet]] paradigm of Hermann Helbig,<ref>{{cite web| url = http://pi7.fernuni-hagen.de/helbig/index_en.html| title = Hermann Helbig| access-date = 14 March 2006| archive-date = 4 May 2006| archive-url = https://web.archive.org/web/20060504090936/http://pi7.fernuni-hagen.de/helbig/index_en.html| url-status = live}}</ref> especially suited for the semantic representation of natural language expressions and used in several [[Natural language processing|NLP]] applications.

Semantic networks are used in specialized information retrieval tasks, such as [[plagiarism detection]]. They provide information on hierarchical relations in order to employ [[semantic compression]] to reduce language diversity and enable the system to match word meanings, independently from sets of words used.

[[Google_Knowledge_Graph|The Knowledge Graph]] proposed by Google in 2012 is actually an application of semantic network in search engine.

Modeling multi-relational data like semantic networks in low-dimensional spaces through forms of [[embedding]] has benefits in expressing entity relationships as well as extracting relations from mediums like text. There are many approaches to learning these embeddings, notably using Bayesian clustering frameworks or energy-based frameworks, and more recently, TransE<ref>{{Citation|last1=Bordes|first1=Antoine|title=Translating Embeddings for Modeling Multi-relational Data|date=2013|url=http://papers.nips.cc/paper/5071-translating-embeddings-for-modeling-multi-relational-data.pdf|work=Advances in Neural Information Processing Systems 26|pages=2787–2795|editor-last=Burges|editor-first=C. J. C.|publisher=Curran Associates, Inc.|access-date=2018-11-29|last2=Usunier|first2=Nicolas|last3=Garcia-Duran|first3=Alberto|last4=Weston|first4=Jason|last5=Yakhnenko|first5=Oksana|editor2-last=Bottou|editor2-first=L.|editor3-last=Welling|editor3-first=M.|editor4-last=Ghahramani|editor4-first=Z.|archive-date=20 December 2018|archive-url=https://web.archive.org/web/20181220220123/http://papers.nips.cc/paper/5071-translating-embeddings-for-modeling-multi-relational-data.pdf|url-status=live}}</ref> ([[Conference on Neural Information Processing Systems|NeurIPS]] 2013). Applications of embedding knowledge base data include [[Social network analysis]] and [[Relationship extraction]].

== See also ==
{{Div col|colwidth=20em}}
* [[Abstract semantic graph]]
* [[Chunking (psychology)]]
* [[CmapTools]]
* [[Concept map]]
* [[Formal semantics (natural language)]]
* [[Knowledge base]]
* [[Network diagram]]
* [[Ontology (information science)]]
* [[Repertory grid]]
* [[Semantic lexicon]]
* [[Semantic similarity network]]
* [[Semantic neural network]]
* [[SemEval]] – an ongoing series of evaluations of [[Semantic analysis (computational)|computational semantic analysis]] systems
* [[Sparse distributed memory]]
* [[Taxonomy (general)]]
* [[Unified Medical Language System]] (UMLS)
* [[Word-sense disambiguation]] (WSD)
* [[Resource Description Framework]]
{{Div col end}}

=== Other examples ===
* [[Cognition Network Technology]]
* [[Lexipedia]]
* [[OpenCog]]
* [[Open Mind Common Sense]] (OMCS)
* [[Schema.org]]
* [[Semantic computing]]
* [[SNOMED CT]]
* [[Universal Networking Language]] (UNL)
* [[Wikidata]]
* [[Freebase (database)|Freebase]]

== References ==
{{reflist|30em}}

== Further reading ==
* Allen, J. and A. Frisch (1982). "[http://www.aclweb.org/anthology/P82-1004 What's in a Semantic Network]". In: ''Proceedings of the 20th. annual meeting of ACL'', Toronto, pp.&nbsp;19–27.
* John F. Sowa, Alexander Borgida (1991). ''[https://books.google.com/books?id=lTKnCQAAQBAJ Principles of Semantic Networks: Explorations in the Representation of Knowledge]''.
* Segev, E. (Ed.) (2022). ''[https://routledge.pub/SemanticNetworkAnalysis Semantic Network Analysis in Social Sciences]''. New York: Routledge.

== External links ==
{{Commons category|Semantic networks}}
* [http://www.jfsowa.com/pubs/semnet.htm "Semantic Networks"] by John F. Sowa
* [https://web.archive.org/web/20091218102540/http://www.knowledgegrid.net/~h.zhuge/SLN.htm "Semantic Link Network" ] by Hai Zhuge

{{Semantic Web}}
{{Natural language processing}}

{{Authority control}}

[[Category:Knowledge representation]]
[[Category:Networks]]
[[Category:Semantic relations]]
[[Category:Mathematical linguistics]]