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228 lines
6.1 KiB
Python
228 lines
6.1 KiB
Python
from mesa.time import BaseScheduler
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from queue import Empty
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from heapq import heappush, heappop, heapreplace
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from collections import deque
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import math
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import logging
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from inspect import getsource
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from numbers import Number
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from textwrap import dedent
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from .utils import logger
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from mesa import Agent as MesaAgent
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INFINITY = float("inf")
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class Delay:
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"""A delay object which can be used both as a return value and as an awaitable (in async code)."""
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__slots__ = ("delta", )
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def __init__(self, delta):
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self.delta = float(delta)
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def __float__(self):
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return self.delta
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def __await__(self):
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return (yield self.delta)
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class DeadAgent(Exception):
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pass
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class DiscreteActivation(BaseScheduler):
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default_interval = 1
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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if hasattr(self.model, 'default_interval'):
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self.default_interval = self.model.interval
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class PQueueActivation(DiscreteActivation):
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"""
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A scheduler which activates each agent with a delay returned by the agent's step method.
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If no delay is returned, a default of 1 is used.
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In each activation, each agent will update its 'next_time'.
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"""
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def __init__(self, *args, shuffle=True, **kwargs):
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super().__init__(*args, **kwargs)
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self._queue = []
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self._shuffle = shuffle
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self.logger = getattr(self.model, "logger", logger).getChild(f"time_{ self.model }")
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self.next_time = self.time
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def add(self, agent: MesaAgent, when=None):
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if when is None:
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when = self.time
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else:
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when = float(when)
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self._schedule(agent, None, when)
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super().add(agent)
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def _schedule(self, agent, when=None, replace=False):
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if when is None:
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when = self.time
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if self._shuffle:
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key = (when, self.model.random.random())
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else:
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key = (when, agent.unique_id)
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if replace:
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heapreplace(self._queue, (key, agent))
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else:
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heappush(self._queue, (key, agent))
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def step(self) -> None:
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"""
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Executes agents in order, one at a time. After each step,
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an agent will signal when it wants to be scheduled next.
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"""
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if self.time == INFINITY:
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return
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next_time = INFINITY
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now = self.time
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while self._queue:
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((when, _id), agent) = self._queue[0]
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if when > now:
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next_time = when
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break
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try:
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when = agent.step() or self.default_interval
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when += now
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except DeadAgent:
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heappop(self._queue)
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continue
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if when == INFINITY:
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heappop(self._queue)
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continue
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self._schedule(agent, when, replace=True)
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self.steps += 1
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self.time = next_time
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if next_time == INFINITY:
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self.model.running = False
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self.time = INFINITY
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return
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class TimedActivation(DiscreteActivation):
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'''A discrete-time scheduler that has time buckets with agents that should be woken at the same time instant.'''
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def __init__(self, *args, shuffle=True, **kwargs):
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super().__init__(*args, **kwargs)
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self._queue = deque()
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self._shuffle = shuffle
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self.logger = getattr(self.model, "logger", logger).getChild(f"time_{ self.model }")
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self.next_time = self.time
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def add(self, agent: MesaAgent, when=None):
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if when is None:
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when = self.time
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else:
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when = float(when)
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self._schedule(agent, None, when)
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super().add(agent)
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def _schedule(self, agent, when=None, replace=False):
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when = when or self.time
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pos = len(self._queue)
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for (ix, l) in enumerate(self._queue):
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if l[0] == when:
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l[1].append(agent)
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return
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if l[0] > when:
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pos = ix
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break
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self._queue.insert(pos, (when, [agent]))
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def step(self) -> None:
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"""
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Executes agents in order, one at a time. After each step,
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an agent will signal when it wants to be scheduled next.
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"""
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if not self._queue:
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return
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now = self.time
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next_time = self._queue[0][0]
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if next_time > now:
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self.time = next_time
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return
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bucket = self._queue.popleft()[1]
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if self._shuffle:
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self.model.random.shuffle(bucket)
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for agent in bucket:
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try:
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when = agent.step() or self.default_interval
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when += now
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except DeadAgent:
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continue
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if when != INFINITY:
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self._schedule(agent, when, replace=True)
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self.steps += 1
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if self._queue:
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self.time = self._queue[0][0]
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else:
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self.time = INFINITY
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class ShuffledTimedActivation(TimedActivation):
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'''
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A TimedActivation scheduler that processes events in random order.
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'''
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def __init__(self, *args, **kwargs):
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super().__init__(*args, shuffle=True, **kwargs)
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class OrderedTimedActivation(TimedActivation):
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'''
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A TimedActivation scheduler that always processes events in
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the same order.
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'''
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def __init__(self, *args, **kwargs):
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super().__init__(*args, shuffle=False, **kwargs)
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Scheduler = TimedActivation
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class Lockstepper:
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'''
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A wrapper class to produce discrete-event schedulers that behave like
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fixed-time schedulers.
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'''
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def __init__(self, scheduler: BaseScheduler, interval=1):
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self.scheduler = scheduler
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self.default_interval = interval
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self.time = scheduler.time
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self.steps = 0
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def step(self):
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end_time = self.time + self.default_interval
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res = None
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while self.scheduler.time < end_time:
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res = self.scheduler.step()
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self.time = end_time
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self.steps += 1
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return res
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def __getattr__(self, name):
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return getattr(self.scheduler, name) |