Agent types

 

Four basic types in order of increasing generality:

•Simple reflex agents

•Model-based reflex agents

•Goal-based agents

•Utility-based agents

Simple reflex agents:

•Select actions on the basis of the current percept, ignoring the rest of the percept histroy.

•Eg:

    Vacuum agent

• Its decision is based only on the current location and on whether that contains dirt

Model-based reflex agents:

•Partial observability-maintain some sort of internal state,depends on percept history,reflects some unobserved aspect.

    2 kind of knowledge:

 1)How world evolves independently of the agent.

2)How the agent’s own action affect the world.

“How the world works”-Model of the world

Goal-based agents:

            •With current state description, the agent needs goal information.

                 Eg: taxi driving- passenger’s destination.

             •Goal based action is straight forward.

                    “What will happen if I do such and such?”
Utility-based agents:

             •Goal alone are not enough to generate high quality

             •Goal just provide distinction between “happy” and “unhappy”.

                     Two kind of cases where goals are inadequate:

                          •  Conflicting goals-some of them can be achieved.

                          •Several goals-none can be acieved,importance of goals are taken.