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92 lines
2.8 KiB
Python
92 lines
2.8 KiB
Python
# Verbatim copy from mesa
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# https://github.com/projectmesa/mesa/blob/976ddfc8a1e5feaaf8007a7abaa9abc7093881a0/examples/virus_on_network/virus_on_network/model.py
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import math
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from enum import Enum
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import networkx as nx
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from soil import *
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class VirusOnNetwork(Environment):
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"""A virus model with some number of agents"""
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num_nodes = 10
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avg_node_degree = 3
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initial_outbreak_size = 1
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virus_spread_chance = 0.4
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virus_check_frequency = 0.4
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recovery_chance = 0
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gain_resistance_chance = 0
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def init(self):
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prob = self.avg_node_degree / self.num_nodes
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# Use internal seed with the networkx generator
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self.create_network(generator=nx.erdos_renyi_graph, n=self.num_nodes, p=prob)
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self.initial_outbreak_size = min(self.initial_outbreak_size, self.num_nodes)
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self.populate_network(VirusAgent)
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# Infect some nodes
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infected_nodes = self.random.sample(list(self.G), self.initial_outbreak_size)
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for a in self.agents(node_id=infected_nodes):
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a.set_state(VirusAgent.infected)
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assert self.number_infected == self.initial_outbreak_size
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@report
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def resistant_susceptible_ratio(self):
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try:
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return self.number_resistant / self.number_susceptible
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except ZeroDivisionError:
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return math.inf
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@report
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@property
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def number_infected(self):
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return self.count_agents(state_id=VirusAgent.infected.id)
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@report
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@property
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def number_susceptible(self):
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return self.count_agents(state_id=VirusAgent.susceptible.id)
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@report
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@property
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def number_resistant(self):
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return self.count_agents(state_id=VirusAgent.resistant.id)
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class VirusAgent(Agent):
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virus_spread_chance = None # Inherit from model
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virus_check_frequency = None # Inherit from model
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recovery_chance = None # Inherit from model
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gain_resistance_chance = None # Inherit from model
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just_been_infected = False
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@state(default=True)
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def susceptible(self):
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if self.just_been_infected:
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self.just_been_infected = False
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return self.infected
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@state
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def infected(self):
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susceptible_neighbors = self.get_neighbors(state_id=self.susceptible.id)
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for a in susceptible_neighbors:
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if self.prob(self.virus_spread_chance):
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a.just_been_infected = True
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if self.prob(self.virus_check_frequency):
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if self.prob(self.recovery_chance):
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if self.prob(self.gain_resistance_chance):
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return self.resistant
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else:
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return self.susceptible
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else:
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return self.infected
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@state
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def resistant(self):
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return self.at(INFINITY)
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if __name__ == "__main__":
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from _config import run_sim
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run_sim(model=VirusOnNetwork) |