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Agent Communication BDI Logic

Agent Communication BDI Logic. CPSC 601.68/CPSC 599.68 Rob Kremer Department of Computer Science University of Calgary.

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Agent Communication BDI Logic

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  1. Agent CommunicationBDI Logic CPSC 601.68/CPSC 599.68 Rob Kremer Department of Computer Science University of Calgary Based on:FIPA. FIPA Communicative Act Library Specification. Foundation for Intelligent Physical Agents, Document number SC00037J, Document source FIPA TC Communication. 2002.

  2. Basics • First order model logic with identity • Three primitive attitudes: Bip i (implicityly) believes p Uip i is uncertain about p but thinks that p is more likely than ¬p Cip (choice) i desires that p currently holds • Other attitudes: PGip i has p as a persistent goal (desire?) Iip i has the intention to bring about p CPSC 609.68/599.68: Agent Communications

  3. Actions a1 ; a2sequence in which a2 follows a1. a1 | a2 nondeterministic choice in which either a1 happens or a2 happens, but not both. Feasible(a,p) a can take place and, if it does, p will be true just after that. (Feasible(a)  Feasible(a, True) Possible(p)  a.Feasible(a,p). Done(a,p) a has just taken place and p was true just before that. (Done(a)  Done(a,True) Agent(i,a) i is the only agent that ever performs (in the past, present or future) the actions a. Single(a) a is not a sequence. ¬Single(a1;a2), but Single(a1|a2) iff Single(a1)/\Single(a2) CPSC 609.68/599.68: Agent Communications

  4. Abbreviations Bifip  Bip \/ Bi¬p Brefi lx(x)y.Bi(lx(x) = y). Agent i believes that it knows the (x which is) . Uifip  Uip \/ Ui¬p Urefi lx(x)y.Ui(lx(x) = y). ABn,i,jp  BiBjBi …p. n is the number of B operators alternating between i and j. CPSC 609.68/599.68: Agent Communications

  5. Property: intending to achieve a RE ⊨ (x . Bi ak=x) // there exists an action /\ RE(ak)=p // who’s RE is p /\ ¬Ci¬Possible(Done(ak)) // that i thinks should be done (Iip IiDone(a1| … |an) // then if i intends p, then i intents one of the act that can achieve it “If I intent to break the vase, then I intent to either drop it, or smash it with a hammer” CPSC 609.68/599.68: Agent Communications

  6. Property: satisfiability of intent ⊨ IiDone(a)  BiFeasible(a) \/ IiBiFeasible(a) If agent i intends a, then it needs to believe a is feasible or at least have the intent to discover if a is feasible “If I intend to build a perpetual motion machine, then I have to believe it’s possible or to at least discover if it’s possible.” CPSC 609.68/599.68: Agent Communications

  7. Property: intent of act implies intent of RE ⊨ IiDone(a)  IiRE(a) If agent i intends a, then it also intents the RE of a “If I intend to drop the vase, then I also intend to break the vase” CPSC 609.68/599.68: Agent Communications

  8. Property: observing an act ⊨ Bi(Done(a) /\ Agent(j,a)  IjRE(a)) If agent i observes j doing a, then i will come to believe the j intends the RE of a. “If I see Jane hammering the vase, then I believe that Jane intends to break the vase” CPSC 609.68/599.68: Agent Communications

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