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157 lines
4.1 KiB
Python
157 lines
4.1 KiB
Python
from soil import FSM, state, default_state, BaseAgent, NetworkAgent, Environment, report, parameters as params
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import math
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class RabbitEnv(Environment):
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prob_death: params.probability = 1e-3
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def init(self):
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a1 = self.add_node(Male)
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a2 = self.add_node(Female)
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a1.add_edge(a2)
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self.add_agent(RandomAccident)
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@report
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@property
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def num_rabbits(self):
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return self.count_agents(agent_class=Rabbit)
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@report
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@property
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def num_males(self):
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return self.count_agents(agent_class=Male)
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@report
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@property
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def num_females(self):
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return self.count_agents(agent_class=Female)
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class Rabbit(NetworkAgent, FSM):
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sexual_maturity = 30
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life_expectancy = 300
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@default_state
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@state
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def newborn(self):
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self.debug("I am a newborn.")
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self.age = 0
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self.offspring = 0
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return self.youngling
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@state
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def youngling(self):
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self.age += 1
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if self.age >= self.sexual_maturity:
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self.debug(f"I am fertile! My age is {self.age}")
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return self.fertile
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@state
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def fertile(self):
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raise Exception("Each subclass should define its fertile state")
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@state
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def dead(self):
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self.die()
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class Male(Rabbit):
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max_females = 5
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mating_prob = 0.005
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@state
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def fertile(self):
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self.age += 1
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if self.age > self.life_expectancy:
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return self.dead
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# Males try to mate
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for f in self.model.agents.filter(
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agent_class=Female, state_id=Female.fertile.id).limit(self.max_females):
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self.debug("FOUND A FEMALE: ", repr(f), self.mating_prob)
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if self.prob(self["mating_prob"]):
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f.impregnate(self)
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break # Take a break
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class Female(Rabbit):
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gestation = 10
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pregnancy = -1
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@state
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def fertile(self):
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# Just wait for a Male
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self.age += 1
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if self.age > self.life_expectancy:
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return self.dead
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if self.pregnancy >= 0:
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return self.pregnant
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def impregnate(self, male):
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self.debug(f"impregnated by {repr(male)}")
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self.mate = male
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self.pregnancy = 0
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self.number_of_babies = int(8 + 4 * self.random.random())
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@state
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def pregnant(self):
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self.debug("I am pregnant")
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self.age += 1
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if self.age >= self.life_expectancy:
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return self.die()
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if self.pregnancy < self.gestation:
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self.pregnancy += 1
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return
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self.debug("Having {} babies".format(self.number_of_babies))
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for i in range(self.number_of_babies):
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state = {}
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agent_class = self.random.choice([Male, Female])
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child = self.model.add_node(agent_class=agent_class, **state)
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child.add_edge(self)
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try:
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child.add_edge(self.mate)
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self.model.agents[self.mate].offspring += 1
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except ValueError:
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self.debug("The father has passed away")
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self.offspring += 1
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self.mate = None
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self.pregnancy = -1
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return self.fertile
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def die(self):
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if "pregnancy" in self and self["pregnancy"] > -1:
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self.debug("A mother has died carrying a baby!!")
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return super().die()
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class RandomAccident(BaseAgent):
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prob_death = None
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def step(self):
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alive = self.get_agents(agent_class=Rabbit, alive=True)
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if not alive:
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return self.die("No more rabbits to kill")
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num_alive = len(alive)
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prob_death = min(1, self.prob_death * num_alive/10)
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self.debug("Killing some rabbits with prob={}!".format(prob_death))
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for i in alive:
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if i.state_id == i.dead.id:
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continue
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if self.prob(prob_death):
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self.debug("I killed a rabbit: {}".format(i.unique_id))
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num_alive -= 1
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self.model.remove_agent(i)
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i.alive = False
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i.killed = True
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self.debug("Rabbits alive: {}".format(num_alive))
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RabbitEnv.run(max_time=1000, seed="MySeed", iterations=1) |