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[WEI] First implementation of algorithm
Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>
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# Copyright (C) 2018-2021 by BDE ENS Paris-Saclay
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# SPDX-License-Identifier: GPL-3.0-or-later
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from typing import Optional
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from typing import Optional, List
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from django.db.models import QuerySet
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from django.forms import Form
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from ...models import WEIClub, WEIRegistration, Bus
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from ...models import WEIClub, WEIRegistration, Bus, WEIMembership
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class WEISurveyInformation:
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@ -50,6 +50,15 @@ class WEIBusInformation:
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self.bus.information = d
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self.bus.save()
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def free_seats(self, surveys: List["WEISurvey"] = None):
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size = self.bus.size
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already_occupied = WEIMembership.objects.filter(bus=self.bus).count()
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valid_surveys = sum(1 for survey in surveys if survey.information.valid) if surveys else 0
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return size - already_occupied - valid_surveys
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def has_free_seats(self, surveys=None):
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return self.free_seats(surveys) > 0
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class WEISurveyAlgorithm:
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"""
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@ -83,7 +92,7 @@ class WEISurveyAlgorithm:
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"""
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Queryset of all buses of the associated wei.
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"""
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return Bus.objects.filter(wei__year=cls.get_survey_class().get_year())
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return Bus.objects.filter(wei__year=cls.get_survey_class().get_year(), size__gt=0)
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@classmethod
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def get_bus_information(cls, bus):
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@ -192,3 +201,11 @@ class WEISurvey:
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self.information.selected_bus_pk = bus.pk
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self.information.selected_bus_name = bus.name
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self.information.valid = True
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def free(self) -> None:
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"""
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Unselect the select bus.
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"""
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self.information.selected_bus_pk = None
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self.information.selected_bus_name = None
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self.information.valid = False
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@ -8,7 +8,6 @@ from django.db import transaction
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from django.utils.translation import gettext_lazy as _
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from .base import WEISurvey, WEISurveyInformation, WEISurveyAlgorithm, WEIBusInformation
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from ...models import Bus
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WORDS = [
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'13 organisé', '3ième mi temps', 'Années 2000', 'Apéro', 'BBQ', 'BP', 'Beauf', 'Binge drinking', 'Bon enfant',
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@ -124,12 +123,25 @@ class WEISurvey2021(WEISurvey):
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"""
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return self.information.step == 20
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def score(self, bus):
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if not self.is_complete():
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raise ValueError("Survey is not ended, can't calculate score")
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bus_info = self.get_algorithm_class().get_bus_information(bus)
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return sum(bus_info.scores[getattr(self.information, 'word' + str(i))] for i in range(1, 21)) / 20
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def scores_per_bus(self):
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return {bus: self.score(bus) for bus in self.get_algorithm_class().get_buses()}
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def ordered_buses(self):
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values = list(self.scores_per_bus().items())
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values.sort(key=lambda item: -item[1])
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return values
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class WEISurveyAlgorithm2021(WEISurveyAlgorithm):
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"""
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The algorithm class for the year 2021.
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For now, the algorithm is quite simple: the selected bus is the chosen bus.
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TODO: Improve this algorithm.
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We use Gale-Shapley algorithm to attribute 1y students into buses.
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"""
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@classmethod
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@ -141,8 +153,43 @@ class WEISurveyAlgorithm2021(WEISurveyAlgorithm):
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return WEIBusInformation2021
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def run_algorithm(self):
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for registration in self.get_registrations():
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survey = self.get_survey_class()(registration)
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rng = Random(survey.information.seed)
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survey.select_bus(rng.choice(Bus.objects.all()))
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survey.save()
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"""
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Gale-Shapley algorithm implementation.
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We modify it to allow buses to have multiple "weddings".
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"""
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surveys = list(self.get_survey_class()(r) for r in self.get_registrations()) # All surveys
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free_surveys = [s for s in surveys if not s.information.valid] # Remaining surveys
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while free_surveys: # Some students are not affected
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survey = free_surveys[0]
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buses = survey.ordered_buses() # Preferences of the student
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for bus, _ in buses:
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if self.get_bus_information(bus).has_free_seats(surveys):
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# Selected bus has free places. Put student in the bus
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survey.select_bus(bus)
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survey.save()
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free_surveys.remove(survey)
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break
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else:
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# Current bus has not enough places. Remove the least preferred student from the bus if existing
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current_score = survey.score(bus)
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least_preferred_survey = None
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least_score = -1
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# Find the least student in the bus that has a lower score than the current student
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for survey2 in surveys:
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if not survey2.information.valid or survey2.information.get_selected_bus() != bus:
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continue
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score2 = survey2.score(bus)
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if current_score <= score2: # Ignore better students
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continue
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if least_preferred_survey is None or score2 < least_score:
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least_preferred_survey = survey2
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least_score = score2
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if least_preferred_survey is not None:
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# Remove the least student from the bus and put the current student in.
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# If it does not exist, choose the next bus.
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least_preferred_survey.free()
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least_preferred_survey.save()
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survey.select_bus(bus)
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survey.save()
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break
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