From efb3dcdc2841d0d4a005a834cd1138f6eec036df Mon Sep 17 00:00:00 2001
From: Nicolas Joyard <joyard.nicolas@gmail.com>
Date: Wed, 29 Jun 2016 20:35:25 +0200
Subject: [PATCH] Change score calculation to exponential decay
---
memopol_settings/fixtures/score_settings.json | 30 ++++++++
.../migrations/0002_score_settings.py | 34 +++++++++
.../migrations/0006_score_formula.py | 76 +++++++++++++++++++
representatives_recommendations/models.py | 8 +-
4 files changed, 144 insertions(+), 4 deletions(-)
create mode 100644 memopol_settings/fixtures/score_settings.json
create mode 100644 memopol_settings/migrations/0002_score_settings.py
create mode 100644 representatives_recommendations/migrations/0006_score_formula.py
diff --git a/memopol_settings/fixtures/score_settings.json b/memopol_settings/fixtures/score_settings.json
new file mode 100644
index 00000000..01ecf76b
--- /dev/null
+++ b/memopol_settings/fixtures/score_settings.json
@@ -0,0 +1,30 @@
+[{
+ "model": "memopol_settings.setting",
+ "pk": "SCORE_DECAY_NUM",
+ "fields": {
+ "value": "0",
+ "comment": "Numerator for decay rate in score formula. Set to 0 for no decay, 1 otherwise. Score formula is base_score * exp( -(vote_age*DECAY_NUM/DECAY_DENOM)^(2*EXPONENT) )."
+ }
+},
+{
+ "model": "memopol_settings.setting",
+ "pk": "SCORE_DECAY_DENOM",
+ "fields": {
+ "value": "1",
+ "comment": "Denominator for decay rate in score formula. Must be nonzero. Set to higher value to delay the score decay. Score formula is base_score * exp( -(vote_age*DECAY_NUM/DECAY_DENOM)^(2*EXPONENT) )."
+ }
+},{
+ "model": "memopol_settings.setting",
+ "pk": "SCORE_EXPONENT",
+ "fields": {
+ "value": "1",
+ "comment": "Exponent for score formula. Set to higher value for a steeper decay around the cutoff. Score formula is base_score * exp( -(vote_age*DECAY_NUM/DECAY_DENOM)^(2*EXPONENT) )."
+ }
+},{
+ "model": "memopol_settings.setting",
+ "pk": "SCORE_DECIMALS",
+ "fields": {
+ "value": "0",
+ "comment": "Number of score decimals to display. Use 0 for integers."
+ }
+}]
\ No newline at end of file
diff --git a/memopol_settings/migrations/0002_score_settings.py b/memopol_settings/migrations/0002_score_settings.py
new file mode 100644
index 00000000..00c7098b
--- /dev/null
+++ b/memopol_settings/migrations/0002_score_settings.py
@@ -0,0 +1,34 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+import os
+
+from django.core import serializers
+from django.db import migrations
+
+fixture_dir = os.path.abspath(
+ os.path.join(
+ os.path.dirname(__file__),
+ '../fixtures'))
+fixture_filename = 'score_settings.json'
+
+
+def load_fixture(apps, schema_editor):
+ fixture_file = os.path.join(fixture_dir, fixture_filename)
+
+ fixture = open(fixture_file, 'rb')
+ objects = serializers.deserialize('json', fixture, ignorenonexistent=True)
+ for obj in objects:
+ obj.save()
+ fixture.close()
+
+
+class Migration(migrations.Migration):
+
+ dependencies = [
+ ('memopol_settings', '0001_initial'),
+ ]
+
+ operations = [
+ migrations.RunPython(load_fixture),
+ ]
diff --git a/representatives_recommendations/migrations/0006_score_formula.py b/representatives_recommendations/migrations/0006_score_formula.py
new file mode 100644
index 00000000..52039c8b
--- /dev/null
+++ b/representatives_recommendations/migrations/0006_score_formula.py
@@ -0,0 +1,76 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+ dependencies = [
+ ('representatives_recommendations', '0005_representativescore'),
+ ]
+
+ operations = [
+ migrations.RunSQL(
+ """
+ DROP VIEW "representatives_recommendations_votescores" CASCADE;
+ """
+ ),
+ migrations.AlterField(
+ model_name='recommendation',
+ name='weight',
+ field=models.FloatField(default=0),
+ ),
+ migrations.RunSQL(
+ """
+ CREATE VIEW "representatives_recommendations_votescores"
+ AS SELECT
+ representatives_votes_vote.id,
+ representatives_votes_vote."position",
+ representatives_votes_vote.proposal_id,
+ representatives_votes_vote.representative_id,
+ ROUND(CAST(EXP(-((decay_num.value * EXTRACT(days FROM CURRENT_DATE - representatives_votes_proposal.datetime) / decay_denom.value) ^ (2 * exponent.value)))
+ * (CASE
+ WHEN representatives_votes_vote."position"::text = representatives_recommendations_recommendation.recommendation::text THEN representatives_recommendations_recommendation.weight
+ ELSE 0 - representatives_recommendations_recommendation.weight
+ END) AS NUMERIC), decimals.value) AS score
+ FROM representatives_votes_vote
+ JOIN (SELECT CAST(TO_NUMBER(value, '99999') AS FLOAT) AS value FROM memopol_settings_setting WHERE key = 'SCORE_DECAY_NUM') decay_num ON 1=1
+ JOIN (SELECT CAST(TO_NUMBER(value, '99999') AS FLOAT) AS value FROM memopol_settings_setting WHERE key = 'SCORE_DECAY_DENOM') decay_denom ON 1=1
+ JOIN (SELECT CAST(TO_NUMBER(value, '99999') AS FLOAT) AS value FROM memopol_settings_setting WHERE key = 'SCORE_EXPONENT') exponent ON 1=1
+ JOIN (SELECT CAST(TO_NUMBER(value, '99999') AS INTEGER) AS value FROM memopol_settings_setting WHERE key = 'SCORE_DECIMALS') decimals ON 1=1
+ JOIN representatives_votes_proposal ON representatives_votes_vote.proposal_id = representatives_votes_proposal.id
+ LEFT JOIN representatives_recommendations_recommendation ON representatives_votes_proposal.id = representatives_recommendations_recommendation.proposal_id
+ WHERE representatives_recommendations_recommendation.id IS NOT NULL;
+ """
+ ),
+ migrations.RunSQL(
+ """
+ CREATE VIEW "representatives_recommendations_dossierscores"
+ AS SELECT
+ "representatives_recommendations_votescores"."representative_id" || ':' || "representatives_votes_proposal"."dossier_id" AS "id",
+ "representatives_recommendations_votescores"."representative_id",
+ "representatives_votes_proposal"."dossier_id",
+ SUM("representatives_recommendations_votescores"."score") AS "score"
+ FROM "representatives_recommendations_votescores"
+ INNER JOIN "representatives_votes_proposal"
+ ON ( "representatives_recommendations_votescores"."proposal_id" = "representatives_votes_proposal"."id" )
+ GROUP BY
+ "representatives_recommendations_votescores"."representative_id",
+ "representatives_votes_proposal"."dossier_id"
+ """
+ ),
+ migrations.RunSQL(
+ """
+ CREATE VIEW "representatives_recommendations_representativescore"
+ AS SELECT
+ "representatives_representative"."id" as "representative_id",
+ COALESCE(SUM("representatives_recommendations_votescores"."score"), 0) AS "score"
+ FROM
+ "representatives_representative"
+ LEFT OUTER JOIN "representatives_recommendations_votescores"
+ ON "representatives_recommendations_votescores"."representative_id" = "representatives_representative"."id"
+ GROUP BY "representatives_representative"."id"
+ """
+ )
+ ]
diff --git a/representatives_recommendations/models.py b/representatives_recommendations/models.py
index 7e887e03..c9a18951 100644
--- a/representatives_recommendations/models.py
+++ b/representatives_recommendations/models.py
@@ -12,7 +12,7 @@ class DossierScore(models.Model):
representative = models.ForeignKey(Representative,
on_delete=models.DO_NOTHING)
dossier = models.ForeignKey(Dossier, on_delete=models.DO_NOTHING)
- score = models.IntegerField(default=0)
+ score = models.FloatField(default=0)
class Meta:
managed = False
@@ -25,7 +25,7 @@ class VoteScore(models.Model):
representative = models.ForeignKey(
Representative, related_name='votescores', null=True)
position = models.CharField(max_length=10)
- score = models.IntegerField(default=0)
+ score = models.FloatField(default=0)
class Meta:
managed = False
@@ -36,7 +36,7 @@ class VoteScore(models.Model):
class RepresentativeScore(models.Model):
representative = models.OneToOneField('representatives.representative',
primary_key=True, related_name='score')
- score = models.IntegerField(default=0)
+ score = models.FloatField(default=0)
class Meta:
managed = False
@@ -52,7 +52,7 @@ class Recommendation(models.Model):
recommendation = models.CharField(max_length=10, choices=Vote.VOTECHOICES)
title = models.CharField(max_length=1000, blank=True)
description = models.TextField(blank=True)
- weight = models.IntegerField(default=0)
+ weight = models.FloatField(default=0)
class Meta:
ordering = ['proposal__datetime']
--
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