To find the PEAS description for the given AI problem and develop an AI agent.
A vacuum-cleaner world with just two locations.
Each location can be clean or dirty.
The agent can move left or right and can clean the square that it occupies.
| Agent Type | Performance Measure | Environment | Actuators | Sensors |
|---|---|---|---|---|
| Vaccum-Cleaner | Cleanliness,Number of Movements | Rooms | Wheels,suction tool | location,Cleanliness |
Identifying the input:
Identifying the output:
Developing the PEAS description:
Implementing the AI agent
Measure the performance parameters
import random
import time
class Thing:
"""
This represents any physical object that can appear in an Environment.
"""
def is_alive(self):
"""Things that are 'alive' should return true."""
return hasattr(self, 'alive') and self.alive
def show_state(self):
"""Display the agent's internal state. Subclasses should override."""
print("I don't know how to show_state.")
class Agent(Thing):
"""
An Agent is a subclass of Thing
"""
def __init__(self, program=None):
self.alive = True
self.performance = 0
self.program = program
def can_grab(self, thing):
"""Return True if this agent can grab this thing.
Override for appropriate subclasses of Agent and Thing."""
return False
def TableDrivenAgentProgram(table):
"""
[Figure 2.7]
This agent selects an action based on the percept sequence.
It is practical only for tiny domains.
To customize it, provide as table a dictionary of all
{percept_sequence:action} pairs.
"""
percepts = []
def program(percept):
action =None
percepts.append(percept)
action=table.get(tuple(percept))
return action
return program
loc_A, loc_B,loc_C, loc_D, loc_E, loc_F, loc_G, loc_H, loc_I= (-1,-1),(0,-1),(1,-1),(1, 0) ,(0, 0),(-1,0),(-1,1),(0,1),(1,1) # The two locations for the Vacuum world
def TableDrivenVacuumAgent():
"""
Tabular approach towards vacuum world
"""
table = {(loc_A, 'Clean'): 'Right',
(loc_A, 'Dirty'): 'Suck',
(loc_B, 'Clean'): 'Right',
(loc_B, 'Dirty'): 'Suck',
(loc_C, 'Clean'): 'Up',
(loc_C, 'Dirty'): 'Suck',
(loc_D, 'Clean'): 'Left',
(loc_D, 'Dirty'): 'Suck',
(loc_E, 'Clean'): 'Left',
(loc_E, 'Dirty'): 'Suck',
(loc_F, 'Clean'): 'Up',
(loc_F, 'Dirty'): 'Suck',
(loc_G, 'Clean'): 'Right',
(loc_G, 'Dirty'): 'Suck',
(loc_H, 'Clean'): 'Right',
(loc_H, 'Dirty'): 'Suck',
(loc_I, 'Clean'): 'Down',
(loc_I, 'Dirty'): 'Suck',
}
return Agent(TableDrivenAgentProgram(table))
class Environment:
"""Abstract class representing an Environment. 'Real' Environment classes
inherit from this. Your Environment will typically need to implement:
percept: Define the percept that an agent sees.
execute_action: Define the effects of executing an action.
Also update the agent.performance slot.
The environment keeps a list of .things and .agents (which is a subset
of .things). Each agent has a .performance slot, initialized to 0.
Each thing has a .location slot, even though some environments may not
need this."""
def __init__(self):
self.things = []
self.agents = []
def percept(self, agent):
"""Return the percept that the agent sees at this point. (Implement this.)"""
raise NotImplementedError
def execute_action(self, agent, action):
"""Change the world to reflect this action. (Implement this.)"""
raise NotImplementedError
def default_location(self, thing):
"""Default location to place a new thing with unspecified location."""
return None
def is_done(self):
"""By default, we're done when we can't find a live agent."""
return not any(agent.is_alive() for agent in self.agents)
def step(self):
"""Run the environment for one time step. If the
actions and exogenous changes are independent, this method will
do. If there are interactions between them, you'll need to
override this method."""
if not self.is_done():
actions = []
for agent in self.agents:
if agent.alive:
actions.append(agent.program(self.percept(agent)))
else:
actions.append("")
for (agent, action) in zip(self.agents, actions):
self.execute_action(agent, action)
def run(self, steps=1000):
"""Run the Environment for given number of time steps."""
for step in range(steps):
if self.is_done():
return
self.step()
def add_thing(self, thing, location=None):
"""Add a thing to the environment, setting its location. For
convenience, if thing is an agent program we make a new agent
for it. (Shouldn't need to override this.)"""
if not isinstance(thing, Thing):
thing = Agent(thing)
if thing in self.things:
print("Can't add the same thing twice")
else:
thing.location = location if location is not None else self.default_location(thing)
self.things.append(thing)
if isinstance(thing, Agent):
thing.performance = 0
self.agents.append(thing)
def delete_thing(self, thing):
"""Remove a thing from the environment."""
try:
self.things.remove(thing)
except ValueError as e:
print(e)
print(" in Environment delete_thing")
print(" Thing to be removed: {} at {}".format(thing, thing.location))
print(" from list: {}".format([(thing, thing.location) for thing in self.things]))
if thing in self.agents:
self.agents.remove(thing)
class TrivialVacuumEnvironment(Environment):
"""This environment has two locations, A and B. Each can be Dirty
or Clean. The agent perceives its location and the location's
status. This serves as an example of how to implement a simple
Environment."""
def __init__(self):
super().__init__()
self.status = {loc_A: random.choice(['Clean', 'Dirty']),
loc_B: random.choice(['Clean', 'Dirty']),
loc_C: random.choice(['Clean', 'Dirty']),
loc_D: random.choice(['Clean', 'Dirty']),
loc_E: random.choice(['Clean', 'Dirty']),
loc_F: random.choice(['Clean', 'Dirty']),
loc_G: random.choice(['Clean', 'Dirty']),
loc_H: random.choice(['Clean', 'Dirty']),
loc_I: random.choice(['Clean', 'Dirty'])}
def thing_classes(self):
return [ TableDrivenVacuumAgent]
def percept(self, agent):
"""Returns the agent's location, and the location status (Dirty/Clean)."""
return agent.location, self.status[agent.location]
def execute_action(self, agent, action):
"""Change agent's location and/or location's status; track performance.
Score 10 for each dirt cleaned; -1 for each move."""
if action=='Right':
agent.location = loc_B or loc_A or loc_G or loc_H
agent.performance -=1
elif action=='Left':
agent.location = loc_D or loc_E
agent.performance -=1
elif action=='Up':
agent.location = loc_C or loc_F
agent.performance -=1
elif action=='Down':
agent.location = loc_I
agent.performance -=1
elif action=='Suck':
if self.status[agent.location]=='Dirty':
agent.performance+=10
self.status[agent.location]='Clean'
def default_location(self, thing):
"""Agents start in either location at random."""
return random.choice([loc_A,loc_B,loc_C,loc_D,loc_E,loc_F,loc_G,loc_H])
if __name__ == "__main__":
agent = TableDrivenVacuumAgent()
environment = TrivialVacuumEnvironment()
environment.add_thing(agent)
print(environment.status)
print("AgentLocation : {0}".format(agent.location))
print("Performance : {0}".format(agent.performance))
time.sleep(5)
for i in range(15):
environment.run(steps=1)
print(environment.status)
print("AgentLocation : {0}".format(agent.location))
print("Performance : {0}".format(agent.performance))
time.sleep(10)
Thus, an AI agent was developed and PEAS description is given
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