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'''Inductive logic programming''' ('''ILP''') is a subfield of [[machine learning]]  which uses [[logic programming]] as a uniform representation for examples, background knowledge and hypotheses. Given an encoding of the known background knowledge and a set of examples represented as a logical database of facts, an ILP system will derive a hypothesised logic program which entails all the positive and none of the negative examples.
 
Schema: ''positive examples'' + ''negative examples'' + ''background knowledge'' => ''hypothesis''.
 
Inductive logic programming is particularly useful in [[bioinformatics]] and [[natural language processing]].
The term ''Inductive Logic Programming'' was first introduced<ref>Luc De Raedt. A Perspective on Inductive Logic Programming. The Workshop on Current and Future Trends in Logic Programming, Shakertown, to appear in Springer LNCS, 1999. [[CiteSeerX]]: {{url|1=http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.56.1790|2=10.1.1.56.1790}}</ref> in a paper by [[Stephen Muggleton]] in 1991.<ref>{{cite doi|10.1007/BF03037089}}</ref> The term "''inductive''" here refers to [[Inductive reasoning|philosophical]] (i.e. suggesting a theory to explain observed facts) rather than [[mathematical induction|mathematical]] (i.e. proving a property for all members of a well-ordered set) induction.
 
==Formal definition==
 
The ''background knowledge'' is given as a logical proposition <math>B</math>, commonly in the form of [[Horn clauses]] used in [[logic programming]].
The ''positive'' and ''negative'' examples are given as a conjunction <math>F^+</math> and <math>F^-</math> of unnegated and negated [[ground expression|ground]] [[Literal (mathematical logic)|literals]], respectively.
A hypothesis <math>h</math> is a logical proposition satisfying the following requirements.<ref>{{cite journal|first1=Stephen|last1=Muggleton|title=Inductive Logic Programming: Issues, Results and the Challenge of Learning Language in Logic|journal=Artificial Intelligence|volume=114|pages=283–296|year=1999}}; here: Sect.2.1</ref>
{|
|-
| Necessity:         
||<math>B</math>
|| <math> \not\models</math>
|| <math> F^+</math>
|-
| Sufficiency:       
|| <math>B \land h</math>
|| [[Entailment#Semantic consequence|<math> \models</math>]]
|| <math> F^+</math>
|-
| Weak consistency: 
|| <math>B \land h</math>
|| <math> \not\models</math>
|| <math> \textit{false}</math>
|-
| Strong consistency:
|| <math>B \land h \land F^-</math>
|| <math> \not\models</math>
|| <math> \textit{false}</math>
|}
 
"''Necessity''" does not impose a restriction on <math>h</math>, but forbids any generation of a hypothesis as long as the positive facts are explainable without it.
"''Sufficiency''" requires any generated hypothesis <math>h</math> to explain all positive examples <math>F^+</math>.
"''Weak consistency''" forbids generation of any hypothesis <math>h</math> that contradicts the background knowledge <math>B</math>.
"''Strong consistency''" also forbids generation of any hypothesis <math>h</math> that is inconsistent with the negative examples <math>F^-</math>, given the background knowledge <math>B</math>; it implies "''Weak consistency''"; if no negative examples are given, both requirements coincide. Džeroski <ref>{{citation|first1=Sašo|last1=Džeroski|contribution=Inductive Logic Programming and Knowledge Discovery in Databases|pages=117–152|editor1-first=U.M.|editor1-last=Fayyad|editor2-first=G.|editor2-last=Piatetsky-Shapiro|editor3-first=P.|editor3-last=Smith|editor4-first=R.|editor4-last=Uthurusamy|title=Advances in Knowledge Discovery and Data Mining|publisher=MIT Press|year=1996}}; here: Sect.5.2.4</ref> requires only "''Sufficiency''" (called "Completeness" there) and "''Strong consistency''".
 
==Example==
 
[[File:Family relations example for inductive logic programming article.gif|thumb|Assumed family relations in section "Example"]]
The following well-known example about learning definitions of family relations uses the abbreviations <math>\textit{par}: \textit{parent}</math>, <math>\textit{fem}: \textit{female}</math>, <math>\textit{dau}: \textit{daughter}</math>, <math>g:\textit{George}</math>, <math>h:\textit{Helen}</math>, <math>m:\textit{Mary}</math>, <math>t:\textit{Tom}</math>, <math>n:\textit{Nancy}</math>, and <math>e:\textit{Eve}</math>. It starts from the background knowledge (cf. picture)
:<math>\textit{par}(h,m) \land \textit{par}(h,t) \land \textit{par}(g,m) \land \textit{par}(t,e) \land \textit{par}(n,e) \land \textit{fem}(h) \land \textit{fem}(m) \land \textit{fem}(n) \land \textit{fem}(e)</math>,
the positive examples
:<math>\textit{dau}(m,h) \land \textit{dau}(e,t)</math>,
and the trivial proposition
<math>\textit{true}</math>
to denote the absence of negative examples.
 
Plotkin's <ref>{{cite journal|first1=Gordon D.|last1=Plotkin|title=A Note on Inductive Generalization|editor1-first=B.|editor1-last=Meltzer|editor2-first=D.|editor2-last=Michie|publisher=Edinburgh University Press|journal=Machine Intelligence|volume=5|pages=153–163|year=1970}}</ref><ref>{{cite journal|first1=Gordon D.|last1=Plotkin|title=A Further Note on Inductive Generalization|editor1-first=B.|editor1-last=Meltzer|editor2-first=D.|editor2-last=Michie|publisher=Edinburgh University Press|journal=Machine Intelligence|volume=6|pages=101–124|year=1971}}</ref> "''relative least general generalization (rlgg)''" approach to ''inductive logic programming'' shall be used to obtain a suggestion about how to formally define the daughter relation <math>\textit{dau}</math>.
 
This approach uses the following steps.
* Relativize each positive example literal with the complete background knowledge:
**<math>\textit{dau}(m,h) \leftarrow \textit{par}(h,m) \land \textit{par}(h,t) \land \textit{par}(g,m) \land \textit{par}(t,e) \land \textit{par}(n,e) \land \textit{fem}(h) \land \textit{fem}(m) \land \textit{fem}(n) \land \textit{fem}(e)</math>
**<math>\textit{dau}(e,t) \leftarrow \textit{par}(h,m) \land \textit{par}(h,t) \land \textit{par}(g,m) \land \textit{par}(t,e) \land \textit{par}(n,e) \land \textit{fem}(h) \land \textit{fem}(m) \land \textit{fem}(n) \land \textit{fem}(e)</math>,
* Convert into [[clause normal form]]:
**<math>\textit{dau}(m,h) \lor \lnot \textit{par}(h,m) \lor \lnot \textit{par}(h,t) \lor \lnot \textit{par}(g,m) \lor \lnot \textit{par}(t,e) \lor \lnot \textit{par}(n,e) \lor \lnot \textit{fem}(h) \lor \lnot \textit{fem}(m) \lor \lnot \textit{fem}(n) \lor \lnot \textit{fem}(e)</math>
**<math>\textit{dau}(e,t) \lor \lnot \textit{par}(h,m) \lor \lnot \textit{par}(h,t) \lor \lnot \textit{par}(g,m) \lor \lnot \textit{par}(t,e) \lor \lnot \textit{par}(n,e) \lor \lnot \textit{fem}(h) \lor \lnot \textit{fem}(m) \lor \lnot \textit{fem}(n) \lor \lnot \textit{fem}(e)</math>,
* [[anti-unification (computer science)|Anti-unify]] each compatible <ref>i.e. sharing the same predicate symbol and negated/unnegated status</ref> pair <ref>in general: <math>n</math>-tuple when <math>n</math> positive example literals are given</ref> of literals:
**<math>\textit{dau}(x_{me},x_{ht})</math> from <math>\textit{dau}(m,h)</math> and <math>\textit{dau}(e,t)</math>,
**<math>\lnot \textit{par}(x_{ht},x_{me})</math> from <math>\lnot \textit{par}(h,m)</math> and <math>\lnot \textit{par}(t,e)</math>,
**<math>\lnot \textit{fem}(x_{me})</math> from <math>\lnot \textit{fem}(m)</math> and <math>\lnot \textit{fem}(e)</math>,
**<math>\lnot \textit{par}(g,m)</math> from <math>\lnot \textit{par}(g,m)</math> and <math>\lnot \textit{par}(g,m)</math>, similar for all other background-knowledge literals
**<math>\lnot \textit{par}(x_{gt},x_{me})</math> from <math>\lnot \textit{par}(g,m)</math> and <math>\lnot \textit{par}(t,e)</math>, and many more negated literals
* Delete all negated literals containing variables that don't occur in a positive literal:
**after deleting all negated literals containing other variables than <math>x_{me},x_{ht}</math>, only <math>\textit{dau}(x_{me},x_{ht}) \lor \lnot \textit{par}(x_{ht},x_{me}) \lor \lnot \textit{fem}(x_{me})</math> remains, together with all ground literals from the background knowledge
* Convert clauses back to Horn form:
** <math>\textit{dau}(x_{me},x_{ht}) \leftarrow \textit{par}(x_{ht},x_{me}) \land \textit{fem}(x_{me}) \land (\text{all background knowledge facts})</math>
The resulting Horn clause is the hypothesis <math>h</math> obtained by the rlgg approach. Ignoring the background knowledge facts, the clause informally reads "''<math>x_{me}</math> is called a daughter of <math>x_{ht}</math> if <math>x_{ht}</math> is the parent of <math>x_{me}</math> and <math>x_{me}</math> is female''", which is a commonly accepted definition.
 
Concerning the [[#Formal definition|above]] requirements, "''Necessity''" was satisfied because the predicate <math>\textit{dau}</math> doesn't appear in the background knowledge, which hence cannot imply any property containing this predicate, such as the positive examples are.
"''Sufficiency''" is satisfied by the computed hypothesis <math>h</math>, since it, together with <math>\textit{par}(h,m) \land \textit{fem}(m)</math> from the background knowledge, implies the first positive example <math>\textit{dau}(m,h)</math>, and similarly  <math>h</math> and <math>\textit{par}(t,e) \land \textit{fem}(e)</math> from the background knowledge implies the second  positive example <math>\textit{dau}(e,t)</math>. "''Weak consistency''" is satisfied by <math>h</math>, since <math>h</math> holds in the (finite) [[Herbrand structure]] described by the background knowledge; similar for "''Strong consistency''".
 
The common definition of the grandmother relation, viz. <math>\textit{gra}(x,z) \leftarrow \textit{fem}(x) \land \textit{par}(x,y) \land \textit{par}(y,z)</math>, cannot be learned using the above approach, since the variable <math>y</math> occurs in the clause body only; the corresponding literals would have been deleted in the 4th step of the approach. To overcome this flaw, that step has to be modified such that it can be parametrized with different ''literal post-selection heuristics''. Historically, the GOLEM implementation is based on the rlgg approach.
 
== Implementations ==
 
* ACE (A Combined Engine) (http://dtai.cs.kuleuven.be/ACE/)
* Aleph (http://web.comlab.ox.ac.uk/oucl/research/areas/machlearn/Aleph/)
* Claudien (http://dtai.cs.kuleuven.be/claudien/)
* DL-Learner (http://dl-learner.org)
* DMax (http://dtai.cs.kuleuven.be/dmax/)
* [[First Order Inductive Learner|FOIL]] (ftp://ftp.cs.su.oz.au/pub/foil6.sh)
* [[Golem (ILP)]] (http://www.doc.ic.ac.uk/~shm/Software/golem)
* Inthelex (INcremental THEory Learner from EXamples) (http://lacam.di.uniba.it:8000/systems/inthelex/)
* Lime (http://cs.anu.edu.au/people/Eric.McCreath/lime.html)
* Mio (http://libra.msra.cn/Publication/3392493/mio-user-s-manual)
* MIS (Model Inference System) by Ehud Shapiro
* [[PROGOL]] (http://www.doc.ic.ac.uk/~shm/Software/progol5.0)
* RSD (http://labe.felk.cvut.cz/~zelezny/rsd/)
* Warmr (now included in ACE)
 
==See also==
* [[Inductive reasoning]]
* [[Inductive programming]]
 
== References ==
{{reflist}}
 
==Further reading==
{{Refbegin}}
* {{cite doi|10.1016/0743-1066(94)90035-3}}
* {{cite book | first1 = N. | last1 = Lavrac | first2 = S. | last2 = Dzeroski | title = Inductive Logic Programming: Techniques and Applications | publisher = Ellis Horwood | location = New York | year = 1994 | isbn = 0-13-457870-8 | url = http://www-ai.ijs.si/SasoDzeroski/ILPBook/ }}
{{Refend}}
 
[[Category:Inductive logic programming|*]]

Latest revision as of 06:25, 11 November 2014

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