mirror of
https://gitlab.crans.org/bde/nk20
synced 2024-11-26 18:37:12 +00:00
[WEI] First implementation of algorithm
Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>
This commit is contained in:
parent
802a6c68cb
commit
199f4ca1f2
@ -1,12 +1,12 @@
|
||||
# Copyright (C) 2018-2021 by BDE ENS Paris-Saclay
|
||||
# SPDX-License-Identifier: GPL-3.0-or-later
|
||||
|
||||
from typing import Optional
|
||||
from typing import Optional, List
|
||||
|
||||
from django.db.models import QuerySet
|
||||
from django.forms import Form
|
||||
|
||||
from ...models import WEIClub, WEIRegistration, Bus
|
||||
from ...models import WEIClub, WEIRegistration, Bus, WEIMembership
|
||||
|
||||
|
||||
class WEISurveyInformation:
|
||||
@ -50,6 +50,15 @@ class WEIBusInformation:
|
||||
self.bus.information = d
|
||||
self.bus.save()
|
||||
|
||||
def free_seats(self, surveys: List["WEISurvey"] = None):
|
||||
size = self.bus.size
|
||||
already_occupied = WEIMembership.objects.filter(bus=self.bus).count()
|
||||
valid_surveys = sum(1 for survey in surveys if survey.information.valid) if surveys else 0
|
||||
return size - already_occupied - valid_surveys
|
||||
|
||||
def has_free_seats(self, surveys=None):
|
||||
return self.free_seats(surveys) > 0
|
||||
|
||||
|
||||
class WEISurveyAlgorithm:
|
||||
"""
|
||||
@ -83,7 +92,7 @@ class WEISurveyAlgorithm:
|
||||
"""
|
||||
Queryset of all buses of the associated wei.
|
||||
"""
|
||||
return Bus.objects.filter(wei__year=cls.get_survey_class().get_year())
|
||||
return Bus.objects.filter(wei__year=cls.get_survey_class().get_year(), size__gt=0)
|
||||
|
||||
@classmethod
|
||||
def get_bus_information(cls, bus):
|
||||
@ -192,3 +201,11 @@ class WEISurvey:
|
||||
self.information.selected_bus_pk = bus.pk
|
||||
self.information.selected_bus_name = bus.name
|
||||
self.information.valid = True
|
||||
|
||||
def free(self) -> None:
|
||||
"""
|
||||
Unselect the select bus.
|
||||
"""
|
||||
self.information.selected_bus_pk = None
|
||||
self.information.selected_bus_name = None
|
||||
self.information.valid = False
|
||||
|
@ -8,7 +8,6 @@ from django.db import transaction
|
||||
from django.utils.translation import gettext_lazy as _
|
||||
|
||||
from .base import WEISurvey, WEISurveyInformation, WEISurveyAlgorithm, WEIBusInformation
|
||||
from ...models import Bus
|
||||
|
||||
WORDS = [
|
||||
'13 organisé', '3ième mi temps', 'Années 2000', 'Apéro', 'BBQ', 'BP', 'Beauf', 'Binge drinking', 'Bon enfant',
|
||||
@ -124,12 +123,25 @@ class WEISurvey2021(WEISurvey):
|
||||
"""
|
||||
return self.information.step == 20
|
||||
|
||||
def score(self, bus):
|
||||
if not self.is_complete():
|
||||
raise ValueError("Survey is not ended, can't calculate score")
|
||||
bus_info = self.get_algorithm_class().get_bus_information(bus)
|
||||
return sum(bus_info.scores[getattr(self.information, 'word' + str(i))] for i in range(1, 21)) / 20
|
||||
|
||||
def scores_per_bus(self):
|
||||
return {bus: self.score(bus) for bus in self.get_algorithm_class().get_buses()}
|
||||
|
||||
def ordered_buses(self):
|
||||
values = list(self.scores_per_bus().items())
|
||||
values.sort(key=lambda item: -item[1])
|
||||
return values
|
||||
|
||||
|
||||
class WEISurveyAlgorithm2021(WEISurveyAlgorithm):
|
||||
"""
|
||||
The algorithm class for the year 2021.
|
||||
For now, the algorithm is quite simple: the selected bus is the chosen bus.
|
||||
TODO: Improve this algorithm.
|
||||
We use Gale-Shapley algorithm to attribute 1y students into buses.
|
||||
"""
|
||||
|
||||
@classmethod
|
||||
@ -141,8 +153,43 @@ class WEISurveyAlgorithm2021(WEISurveyAlgorithm):
|
||||
return WEIBusInformation2021
|
||||
|
||||
def run_algorithm(self):
|
||||
for registration in self.get_registrations():
|
||||
survey = self.get_survey_class()(registration)
|
||||
rng = Random(survey.information.seed)
|
||||
survey.select_bus(rng.choice(Bus.objects.all()))
|
||||
survey.save()
|
||||
"""
|
||||
Gale-Shapley algorithm implementation.
|
||||
We modify it to allow buses to have multiple "weddings".
|
||||
"""
|
||||
surveys = list(self.get_survey_class()(r) for r in self.get_registrations()) # All surveys
|
||||
free_surveys = [s for s in surveys if not s.information.valid] # Remaining surveys
|
||||
while free_surveys: # Some students are not affected
|
||||
survey = free_surveys[0]
|
||||
buses = survey.ordered_buses() # Preferences of the student
|
||||
for bus, _ in buses:
|
||||
if self.get_bus_information(bus).has_free_seats(surveys):
|
||||
# Selected bus has free places. Put student in the bus
|
||||
survey.select_bus(bus)
|
||||
survey.save()
|
||||
free_surveys.remove(survey)
|
||||
break
|
||||
else:
|
||||
# Current bus has not enough places. Remove the least preferred student from the bus if existing
|
||||
current_score = survey.score(bus)
|
||||
least_preferred_survey = None
|
||||
least_score = -1
|
||||
# Find the least student in the bus that has a lower score than the current student
|
||||
for survey2 in surveys:
|
||||
if not survey2.information.valid or survey2.information.get_selected_bus() != bus:
|
||||
continue
|
||||
score2 = survey2.score(bus)
|
||||
if current_score <= score2: # Ignore better students
|
||||
continue
|
||||
if least_preferred_survey is None or score2 < least_score:
|
||||
least_preferred_survey = survey2
|
||||
least_score = score2
|
||||
|
||||
if least_preferred_survey is not None:
|
||||
# Remove the least student from the bus and put the current student in.
|
||||
# If it does not exist, choose the next bus.
|
||||
least_preferred_survey.free()
|
||||
least_preferred_survey.save()
|
||||
survey.select_bus(bus)
|
||||
survey.save()
|
||||
break
|
||||
|
Loading…
Reference in New Issue
Block a user