Abstract
We develop a progressive inference approach for Probabilistic Argumentation, and then implement obtained algorithms for three standard semantics: the credulous, the ideal, and the skeptical preferred semantics. Like their exact counterparts, these algorithms can be destined to compute the exact answers, however while doing so, they can output immediate answers increasingly close to the exact ones.
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Notes
- 1.
PABA and ABA are formally defined in Sect. 2.
- 2.
Shorthands for \({{\varvec{b}}}urglary, {{\varvec{e}}}arthquake, {{\varvec{p1}}}\_alarm, {{\varvec{p2}}}\_alarm, {{\varvec{p3}}}\_alarm\) respectively.
- 3.
The dependency of burglaries on earthquakes as well as parameter values are made up for the sake of illustrations.
- 4.
credulous/grounded/ideal semantics.
- 5.
For convenience, define \(head(r) = l_0\) and \(body(r) = \{l_1,\dots l_n\}\).
- 6.
Note that any admissible set of assumptions is a subset of some preferred set of assumptions; and any preferred set of assumptions is also admissible.
- 7.
An ABA \({\mathcal {F}}\) is finitary if for each node in the dependency graph of \({\mathcal {F}}\), there is a finite number of nodes reachable from it; and positively acyclic if in the dependency graph of \({\mathcal {F}}\), there is no infinite directed path consisting solely non-assumption nodes.
- 8.
A probabilistic assumption is an element of \({\mathcal {A}}_p \cup \lnot {\mathcal {A}}_p\). A proposition not in \({\mathcal {A}}_p \cup \lnot {\mathcal {A}}_p\) is called a non-probabilistic proposition.
- 9.
G is a directed acyclic graph over \(\mathcal X = \{X_1, \dots , X_m\}\) and \(\varTheta \) is a set of conditional probability tables (CPTs), one CPT \(\varTheta _{X\mid par(X)}\) for each \(X \in \mathcal X\).
- 10.
Note that \({\mathcal {F}}_{s'}\) is obtained from \({\mathcal {F}}\) by adding a set of facts \(\{p \leftarrow \mid p \in s'\}\).
- 11.
We use Problog [8] syntax.
- 12.
We have developed sound translation schemes for the ideal semantics and skeptical preferred semantics. However they can not be presented here due to lack of space.
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Acknowledgment
This work is supported by SIIT Young Researcher Grant, contract no SIIT 2017-YRG-NH02.
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Hung, N.D. (2018). Progressive Inference Algorithms for Probabilistic Argumentation. In: Miller, T., Oren, N., Sakurai, Y., Noda, I., Savarimuthu, B.T.R., Cao Son, T. (eds) PRIMA 2018: Principles and Practice of Multi-Agent Systems. PRIMA 2018. Lecture Notes in Computer Science(), vol 11224. Springer, Cham. https://doi.org/10.1007/978-3-030-03098-8_23
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