66 lines
2.2 KiB
Python
66 lines
2.2 KiB
Python
import math
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import statistics
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from operator import itemgetter
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from django.core.management.base import BaseCommand, CommandError
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from django_scopes import scope
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from pretalx.event.models import Event
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from pretalx.submission.models import Submission
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from ...models import Rating, Score
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RATINGS_MIN = 30
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SCALE = list(map(float, map(itemgetter(0), Rating.RATING_CHOICES)))
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MEAN = statistics.mean(SCALE)
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STD = math.sqrt(statistics.mean([(i - MEAN) ** 2 for i in SCALE]))
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class Command(BaseCommand):
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help = "Compute submission scores from ratings"
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def add_arguments(self, parser):
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parser.add_argument("event")
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def handle(self, *args, **kwargs):
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try:
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event = Event.objects.get(slug=kwargs["event"])
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except Event.DoesNotExist:
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raise CommandError(f"no event found with slug '{kwargs['event']}'")
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with scope(event=event):
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submissions = {}
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for juror in event.jurors.prefetch_related("ratings"):
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ratings = {
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r.submission.code: int(r.rating)
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for r in juror.ratings.exclude(rating="")
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}
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values = list(ratings.values())
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if len(values) < RATINGS_MIN:
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mean = MEAN
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std = STD
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else:
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mean = sum(values) / len(values)
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std = math.sqrt(
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sum([(i - mean) ** 2 for i in values]) / len(values)
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)
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for code in ratings:
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if code not in submissions:
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submissions[code] = []
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submissions[code].append((ratings[code] - mean) / std * STD + MEAN)
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for submission in Submission.objects.prefetch_related("score").filter(
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code__in=submissions.keys()
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):
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try:
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score = submission.score
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except Submission.score.RelatedObjectDoesNotExist:
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score = Score(submission=submission)
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ratings = submissions[submission.code]
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score.value = sum(ratings) / len(ratings)
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score.save()
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