Release 0.20.7

.gitlab-ci.yml

@@ -37,7 +37,7 @@ push_pypi:
     - echo $CI_COMMIT_TAG > soil/VERSION
     - pip install twine
     - python setup.py sdist bdist_wheel
-    - TWINE_PASSWORD=${PYPI_PASSWORD} TWINE_USERNAME={PYPI_USERNAME} python -m twine upload --ignore-existing dist/*
+    - TWINE_PASSWORD=$PYPI_PASSWORD TWINE_USERNAME=$PYPI_USERNAME python -m twine upload dist/*
 
 check_pypi:
   only:
@@ -48,3 +48,6 @@ check_pypi:
   stage: check_published
   script:
     - pip install soil==$CI_COMMIT_TAG
+  # Allow PYPI to update its index before we try to install 
+  when: delayed
+  start_in: 2 minutes

CHANGELOG.md

@@ -3,6 +3,39 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [UNRELEASED]
+## [0.20.7]
+### Changed
+* Creating a `time.When` from another `time.When` does not nest them anymore (it returns the argument)
+### Fixed
+* Bug with time.NEVER/time.INFINITY
+## [0.20.6]
+### Fixed
+* Agents now return `time.INFINITY` when dead, instead of 'inf'
+* `soil.__init__` does not re-export built-in time (change in `soil.simulation`. It used to create subtle import conflicts when importing soil.time.
+* Parallel simulations were broken because lambdas cannot be pickled properly, which is needed for multiprocessing.
+### Changed
+* Some internal simulation methods do not accept `*args` anymore, to avoid ambiguity and bugs.
+## [0.20.5]
+### Changed
+* Defaults are now set in the agent __init__, not in the environment. This decouples both classes a bit more, and it is more intuitive 
+## [0.20.4]
+### Added
+* Agents can now be given any kwargs, which will be used to set their state
+* Environments have a default logger `self.logger` and a log method, just like agents
+## [0.20.3]
+### Fixed
+* Default state values are now deepcopied again.
+* Seeds for environments only concatenate the trial id (i.e., a number), to provide repeatable results.
+* `Environment.run` now calls `Environment.step`, to allow for easy overloading of the environment step
+### Removed
+* Datacollectors are not being used for now.
+* `time.TimedActivation.step` does not use an `until` parameter anymore.
+### Changed
+* Simulations now run right up to `until` (open interval)
+* Time instants (`time.When`) don't need to be floats anymore. Now we can avoid precision issues with big numbers by using ints.
+* Rabbits simulation is more idiomatic (using subclasses)
+
 ## [0.20.2]
 ### Fixed
 * CI/CD testing issues

docs/requirements.txt

@@ -1 +1 @@
-ipython==7.23
+ipython==7.31.1

examples/newsspread/newsspread.py

@@ -17,7 +17,7 @@ class DumbViewer(FSM):
     def neutral(self):
         if self['has_tv']:
             if prob(self.env['prob_tv_spread']):
-                self.set_state(self.infected)
+                return self.infected
 
     @state
     def infected(self):
@@ -26,6 +26,12 @@ class DumbViewer(FSM):
                 neighbor.infect()
 
     def infect(self):
+        '''
+        This is not a state. It is a function that other agents can use to try to
+        infect this agent. DumbViewer always gets infected, but other agents like
+        HerdViewer might not become infected right away
+        '''
+
         self.set_state(self.infected)
 
 
@@ -35,12 +41,13 @@ class HerdViewer(DumbViewer):
     '''
 
     def infect(self):
+        '''Notice again that this is NOT a state. See DumbViewer.infect for reference'''
         infected = self.count_neighboring_agents(state_id=self.infected.id)
         total = self.count_neighboring_agents()
         prob_infect = self.env['prob_neighbor_spread'] * infected/total
         self.debug('prob_infect', prob_infect)
         if prob(prob_infect):
-            self.set_state(self.infected.id)
+            self.set_state(self.infected)
 
 
 class WiseViewer(HerdViewer):
@@ -75,5 +82,5 @@ class WiseViewer(HerdViewer):
                        1.0)
         prob_cure = self.env['prob_neighbor_cure'] * (cured/infected)
         if prob(prob_cure):
-            return self.cure()
+            return self.cured
         return self.set_state(super().infected)

examples/programmatic/programmatic.py

@@ -18,7 +18,9 @@ class MyAgent(agents.FSM):
     @agents.default_state
     @agents.state
     def neutral(self):
-        self.info('I am running')
+        self.debug('I am running')
+        if agents.prob(0.2):
+            self.info('This runs 2/10 times on average')
 
 
 s = Simulation(name='Programmatic',
@@ -29,10 +31,10 @@ s = Simulation(name='Programmatic',
                dry_run=True)
 
 
+# By default, logging will only print WARNING logs (and above).
+# You need to choose a lower logging level to get INFO/DEBUG traces
 logging.basicConfig(level=logging.INFO)
 envs = s.run()
 
-s.dump_yaml()
-
-for env in envs:
-    env.dump_csv()
+# Uncomment this to output the simulation to a YAML file
+# s.dump_yaml('simulation.yaml')

examples/rabbits/rabbit_agents.py

@@ -12,8 +12,6 @@ class Genders(Enum):
 
 class RabbitModel(FSM):
 
-    level = logging.INFO
-
     defaults = {
         'age': 0,
         'gender': Genders.male.value,
@@ -36,6 +34,17 @@ class RabbitModel(FSM):
         if self['age'] >= self.sexual_maturity:
             self.debug('I am fertile!')
             return self.fertile
+    @state
+    def fertile(self):
+        raise Exception("Each subclass should define its fertile state")
+
+    @state
+    def dead(self):
+        self.info('Agent {} is dying'.format(self.id))
+        self.die()
+
+
+class Male(RabbitModel):
 
     @state
     def fertile(self):
@@ -47,20 +56,26 @@ class RabbitModel(FSM):
             return
 
         # Males try to mate
-        for f in self.get_agents(state_id=self.fertile.id, gender=Genders.female.value, limit_neighbors=False, limit=self.max_females):
+        for f in self.get_agents(state_id=Female.fertile.id,
+                                 agent_type=Female,
+                                 limit_neighbors=False,
+                                 limit=self.max_females):
             r = random()
             if r < self['mating_prob']:
                 self.impregnate(f)
                 break # Take a break
-
     def impregnate(self, whom):
-        if self['gender'] == Genders.female.value:
-            raise NotImplementedError('Females cannot impregnate')
         whom['pregnancy'] = 0
         whom['mate'] = self.id
         whom.set_state(whom.pregnant)
         self.debug('{} impregnating: {}. {}'.format(self.id, whom.id, whom.state))
 
+class Female(RabbitModel):
+    @state
+    def fertile(self):
+        # Just wait for a Male
+        pass
+
     @state
     def pregnant(self):
         self['age'] += 1
@@ -90,11 +105,9 @@ class RabbitModel(FSM):
 
     @state
     def dead(self):
-        self.info('Agent {} is dying'.format(self.id))
+        super().dead()
         if 'pregnancy' in self and self['pregnancy'] > -1:
             self.info('A mother has died carrying a baby!!')
-        self.die()
-        return
 
 
 class RandomAccident(NetworkAgent):

examples/rabbits/rabbits.yml

@@ -1,23 +1,21 @@
 ---
 load_module: rabbit_agents
 name: rabbits_example
-max_time: 150
+max_time: 100
 interval: 1
 seed: MySeed
-agent_type: RabbitModel
+agent_type: rabbit_agents.RabbitModel
 environment_agents:
-    - agent_type: RandomAccident
+    - agent_type: rabbit_agents.RandomAccident
 environment_params:
   prob_death: 0.001
 default_state:
-  mating_prob: 0.01
+  mating_prob: 0.1
 topology:
   nodes:
     - id: 1
-      state:
-        gender: female
+      agent_type: rabbit_agents.Male
     - id: 0
-      state:
-        gender: male
+      agent_type: rabbit_agents.Female
   directed: true
   links: []

soil/VERSION

@@ -1 +1 @@
-0.20.1
+0.20.7

soil/__init__.py

@@ -65,6 +65,10 @@ def main():
 
     logger.info('Loading config file: {}'.format(args.file))
 
+    if args.pdb:
+        args.synchronous = True
+
+
     try:
         exporters = list(args.exporter or ['default', ])
         if args.csv:

soil/agents/__init__.py

@@ -35,7 +35,9 @@ class BaseAgent(Agent):
                  unique_id,
                  model,
                  name=None,
-                 interval=None):
+                 interval=None,
+                 **kwargs
+    ):
         # Check for REQUIRED arguments
         # Initialize agent parameters
         if isinstance(unique_id, Agent):
@@ -52,6 +54,12 @@ class BaseAgent(Agent):
 
         if hasattr(self, 'level'):
             self.logger.setLevel(self.level)
+        for (k, v) in self.defaults.items():
+            if not hasattr(self, k) or getattr(self, k) is None:
+                setattr(self, k, deepcopy(v))
+
+        for (k, v) in kwargs.items():
+            setattr(self, k, v)
 
 
     # TODO: refactor to clean up mesa compatibility
@@ -137,6 +145,7 @@ class BaseAgent(Agent):
         self.alive = False
         if remove:
             self.remove_node(self.id)
+        return time.NEVER
 
     def step(self):
         if not self.alive:
@@ -305,18 +314,16 @@ class FSM(NetworkAgent, metaclass=MetaFSM):
 
     def step(self):
         self.debug(f'Agent {self.unique_id} @ state {self.state_id}')
-        try:
-            interval = super().step()
-        except DeadAgent:
-            return time.When('inf')
+        interval = super().step()
         if 'id' not in self.state:
-            # if 'id' in self.state:
-            #     self.set_state(self.state['id'])
             if self.default_state:
                 self.set_state(self.default_state.id)
             else:
                 raise Exception('{} has no valid state id or default state'.format(self))
-        return self.states[self.state_id](self) or interval
+        interval = self.states[self.state_id](self) or interval
+        if not self.alive:
+            return time.NEVER
+        return interval
 
     def set_state(self, state):
         if hasattr(state, 'id'):

soil/environment.py

@@ -5,6 +5,7 @@ import math
 import random
 import yaml
 import tempfile
+import logging
 import pandas as pd
 from time import time as current_time
 from copy import deepcopy
@@ -101,6 +102,8 @@ class Environment(Model):
             environment_agents = agents._convert_agent_types(distro)
         self.environment_agents = environment_agents
 
+        self.logger = utils.logger.getChild(self.name)
+
     @property
     def now(self):
         if self.schedule:
@@ -169,11 +172,8 @@ class Environment(Model):
         if agent_type:
             state = defstate
             a = agent_type(model=self,
-                           unique_id=agent_id)
-
-        for (k, v) in getattr(a, 'defaults', {}).items():
-            if not hasattr(a, k) or getattr(a, k) is None:
-                setattr(a, k, v)
+                           unique_id=agent_id
+            )
 
         for (k, v) in state.items():
             setattr(a, k, v)
@@ -197,17 +197,29 @@ class Environment(Model):
         start = start or self.now
         return self.G.add_edge(agent1, agent2, **attrs)
 
+    def log(self, message, *args, level=logging.INFO, **kwargs):
+        if not self.logger.isEnabledFor(level):
+            return
+        message = message + " ".join(str(i) for i in args)
+        message = " @{:>3}: {}".format(self.now, message)
+        for k, v in kwargs:
+            message += " {k}={v} ".format(k, v)
+        extra = {}
+        extra['now'] = self.now
+        extra['unique_id'] = self.name
+        return self.logger.log(level, message, extra=extra)
+
     def step(self):
         super().step()
-        self.datacollector.collect(self)
         self.schedule.step()
 
     def run(self, until, *args, **kwargs):
         self._save_state()
 
-        while self.schedule.next_time <= until and not math.isinf(self.schedule.next_time):
-            self.schedule.step(until=until)
+        while self.schedule.next_time < until:
+            self.step()
             utils.logger.debug(f'Simulation step {self.schedule.time}/{until}. Next: {self.schedule.next_time}')
+        self.schedule.time = until
         self._history.flush_cache()
 
     def _save_state(self, now=None):

soil/simulation.py

@@ -1,11 +1,12 @@
 import os
-import time
 import importlib
 import sys
 import yaml
 import traceback
 import logging
 import networkx as nx
+
+from time import strftime
 from networkx.readwrite import json_graph
 from multiprocessing import Pool
 from functools import partial
@@ -98,7 +99,7 @@ class Simulation:
         self.network_params = network_params
         self.name = name or 'Unnamed'
         self.seed = str(seed or name)
-        self._id = '{}_{}'.format(self.name, time.strftime("%Y-%m-%d_%H.%M.%S"))
+        self._id = '{}_{}'.format(self.name, strftime("%Y-%m-%d_%H.%M.%S"))
         self.group = group or ''
         self.num_trials = num_trials
         self.max_time = max_time
@@ -142,12 +143,10 @@ class Simulation:
         '''Run the simulation and return the list of resulting environments'''
         return list(self.run_gen(*args, **kwargs))
 
-    def _run_sync_or_async(self, parallel=False, *args, **kwargs):
+    def _run_sync_or_async(self, parallel=False, **kwargs):
         if parallel and not os.environ.get('SENPY_DEBUG', None):
             p = Pool()
-            func = partial(self.run_trial_exceptions,
-                           *args,
-                           **kwargs)
+            func = partial(self.run_trial_exceptions, **kwargs)
             for i in p.imap_unordered(func, range(self.num_trials)):
                 if isinstance(i, Exception):
                     logger.error('Trial failed:\n\t%s', i.message)
@@ -155,10 +154,10 @@ class Simulation:
                 yield i
         else:
             for i in range(self.num_trials):
-                yield self.run_trial(*args,
+                yield self.run_trial(trial_id=i,
                                      **kwargs)
 
-    def run_gen(self, *args, parallel=False, dry_run=False,
+    def run_gen(self, parallel=False, dry_run=False,
                 exporters=[default, ], stats=[], outdir=None, exporter_params={},
                 stats_params={}, log_level=None,
                 **kwargs):
@@ -184,8 +183,7 @@ class Simulation:
 
             for exporter in exporters:
                 exporter.start()
-            for env in self._run_sync_or_async(*args,
-                                               parallel=parallel,
+            for env in self._run_sync_or_async(parallel=parallel,
                                                log_level=log_level,
                                                **kwargs):
 
@@ -224,7 +222,7 @@ class Simulation:
         '''Create an environment for a trial of the simulation'''
         opts = self.environment_params.copy()
         opts.update({
-            'name': trial_id,
+            'name': '{}_trial_{}'.format(self.name, trial_id),
             'topology': self.topology.copy(),
             'network_params': self.network_params,
             'seed': '{}_trial_{}'.format(self.seed, trial_id),
@@ -241,12 +239,11 @@ class Simulation:
         env = self.environment_class(**opts)
         return env
 
-    def run_trial(self, until=None, log_level=logging.INFO, **opts):
+    def run_trial(self, trial_id=0, until=None, log_level=logging.INFO, **opts):
         """
         Run a single trial of the simulation
 
         """
-        trial_id = '{}_trial_{}'.format(self.name, time.time()).replace('.', '-')
         if log_level:
             logger.setLevel(log_level)
         # Set-up trial environment and graph

soil/time.py

@@ -6,15 +6,21 @@ from .utils import logger
 from mesa import Agent
 
 
+INFINITY = float('inf')
+
 class When:
     def __init__(self, time):
-        self._time = float(time)
+        if isinstance(time, When):
+            return time
+        self._time = time
 
     def abs(self, time):
         return self._time
 
+NEVER = When(INFINITY)
 
-class Delta:
+
+class Delta(When):
     def __init__(self, delta):
         self._delta = delta
 
@@ -40,48 +46,35 @@ class TimedActivation(BaseScheduler):
             heappush(self._queue, (self.time, agent.unique_id))
             super().add(agent)
 
-    def step(self, until: float =float('inf')) -> None:
+    def step(self) -> None:
         """
         Executes agents in order, one at a time. After each step,
         an agent will signal when it wants to be scheduled next.
         """
 
-        when = None
-        agent_id = None
-        unsched = []
-        until = until or float('inf')
+        if self.next_time == INFINITY:
+            return
+
+        self.time = self.next_time
+        when = self.time
+
+        while self._queue and self._queue[0][0] == self.time:
+            (when, agent_id) = heappop(self._queue)
+            logger.debug(f'Stepping agent {agent_id}')
+
+            returned = self._agents[agent_id].step()
+            when = (returned or Delta(1)).abs(self.time)
+            if when < self.time:
+                raise Exception("Cannot schedule an agent for a time in the past ({} < {})".format(when, self.time))
+
+            heappush(self._queue, (when, agent_id))
+
+        self.steps += 1
 
         if not self._queue:
-            self.time = until
-            self.next_time = float('inf')
+            self.time = INFINITY
+            self.next_time = INFINITY
             return
 
-        (when, agent_id) = self._queue[0]
+        self.next_time = self._queue[0][0]
 
-        if until and when > until:
-            self.time = until
-            self.next_time = when
-            return
-
-        self.time = when
-        next_time = float("inf")
-
-        while when == self.time:
-            heappop(self._queue)
-            logger.debug(f'Stepping agent {agent_id}')
-            when = (self._agents[agent_id].step() or Delta(1)).abs(self.time)
-            heappush(self._queue, (when, agent_id))
-            if when < next_time:
-                next_time = when
-
-            if not self._queue or self._queue[0][0] > self.time:
-                agent_id = None
-                break
-            else:
-                (when, agent_id) = self._queue[0]
-
-        if when and when < self.time:
-            raise Exception("Invalid scheduling time")
-
-        self.next_time = next_time
-        self.steps += 1

tests/test_agents.py

@@ -0,0 +1,22 @@
+from unittest import TestCase
+import pytest
+
+from soil import agents, environment
+from soil import time as stime
+
+class Dead(agents.FSM):
+    @agents.default_state
+    @agents.state
+    def only(self):
+        self.die()
+
+class TestMain(TestCase):
+    def test_die_raises_exception(self):
+        d = Dead(unique_id=0, model=environment.Environment())
+        d.step()
+        with pytest.raises(agents.DeadAgent):
+            d.step()
+
+    def test_die_returns_infinity(self):
+        d = Dead(unique_id=0, model=environment.Environment())
+        assert d.step().abs(0) == stime.INFINITY

tests/test_main.py

@@ -127,7 +127,7 @@ class TestMain(TestCase):
         env = s.run_simulation(dry_run=True)[0]
         for agent in env.network_agents:
             last = 0
-            assert len(agent[None, None]) == 11
+            assert len(agent[None, None]) == 10
             for step, total in sorted(agent['total', None]):
                 assert total == last + 2
                 last = total