Intelligent agent.

Agents and Environments.

An Agent is anything that can be viewed as perceiving its environment through sensors and acting upon that environment through Actuators.

This idea is illustrated in figure (1)

Figure (1) Agents interact with environments through sensors and actuators.

Example: A human agent has eyes, ears and other organs for sensors and hands legs, mouth and other body parts for actuators.

Example: A robotic agent might have cameras and infrared range finders for sensors an various motors for actuators.

Percept: we use the term percepect to refer t agents perceptual inputs o any given instance.

Percept sequence: An agent's percept sequence is the complete history of everything the agent has ever perceived. "An agent's choice of action at any given instant can depend on the entire percept sequence observed to date".

Agent function: an agents behavior is described by the agent function that maps any given percept sequence to an action.

The agent function that describes any given agent in the form of table that table is very large infinite.here, construct the this table by trying out all possible percept sequences and recording which actions the agent does in response table external characteristics of the agent.

Agent program: Internally, the agent function for an artificial agent will be implemented by agent program.

Example: Vacuum cleaner world - figure (2)

It has two location A and B.

The vacuum agent perceives which square it is in and whether there is dirt in the square it can choose to move left, move right, suckup the dirt, or do nothing.

One very simple agent function is following: If the current square is dirty, then suck, otherwise move to other square.

Figure (2) A vacuum cleaner world with just 2 locations.

Table - Partial tabulation of simple agent functions for the vacuum cleaner world.