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Chapter 4 Practical Reasoning Agents

Chapter 4 Practical Reasoning Agents. CSE 431 – Intelligent Agents. A Blocks World Problem. initial state On(A,Table)  On(B,Table)  On(C,Table)  Clear(A)  Clear(B)  Clear(C)  Clear(Table)  Block(A)  Block(B)  Block(C) goal state On(C,Table)  On(B,C)  On(A,B)

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Chapter 4 Practical Reasoning Agents

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  1. Chapter 4Practical Reasoning Agents CSE 431 – Intelligent Agents

  2. A Blocks World Problem • initial state • On(A,Table)  On(B,Table)  On(C,Table)  Clear(A)  Clear(B)  Clear(C)  Clear(Table)  Block(A)  Block(B)  Block(C) • goal state • On(C,Table)  On(B,C)  On(A,B) • actions • Action(Move(b,x,y) , Precond: On(b,x)  Clear(b)  Clear(y)  Block(y), Effect: On(b,y)  Clear(x) On(b,x) Clear(y)) • Action(MoveToTable(b,x), Precond: On(b,x)  Clear(b), Effect: On(b,Table)  Clear(x) On(b,x))

  3. Practical Reasoning Agent B  B0;I  I0;while true do get next percept p through see() function; B  brf(B, p)D  options(B,I); I  filter(B,D,I); plan(B,I,Ac); while not (empty() or succeeded(I,B) or impossible(I,B)) do hd(); execute(); tail(); get next percept p through see() function; B  brf(B, p); if reconsider(I,B) then D  options(B,I); I  filter(B,D,I); end-if if not sound(,I,B) then plan(B,I,Ac) end-if end-whileend-while From Fig. 4.3, p. 76

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