remove anti voters, extend post vote lifetime to 90 days, add minimum score threshold for super voters

app/controllers/anti_voters_controller.rb

@@ -1,8 +0,0 @@
-class AntiVotersController < ApplicationController
-  before_filter :member_only
-
-  def index
-    @anti_voters = AntiVoter.all
-  end
-end
-

app/logical/post_vote_similarity.rb

@@ -1,6 +1,8 @@
 require "set"
 
 class PostVoteSimilarity
+  THRESHOLD = 0.08
+
   class Element
     attr_reader :user_id, :score
 
@@ -20,19 +22,6 @@ class PostVoteSimilarity
     @user_id = user_id
   end
 
-  # returns user ids with strong negative correlation
-  def calculate_negative(limit = 10)
-    posts0 = PostVote.negative_post_ids(user_id)
-    set = SortedSet.new
-
-    PostVote.positive_user_ids.each do |uid|
-      posts1 = PostVote.positive_post_ids(uid)
-      set.add(Element.new(uid, calculate_with_cosine(posts0, posts1)))
-    end
-
-    set.first(limit)
-  end
-
   # returns user ids with strong positive correlation
   def calculate_positive(limit = 10)
     posts0 = PostVote.positive_post_ids(user_id)
@@ -40,7 +29,10 @@ class PostVoteSimilarity
 
     PostVote.positive_user_ids.each do |uid|
       posts1 = PostVote.positive_post_ids(uid)
-      set.add(Element.new(uid, calculate_with_cosine(posts0, posts1)))
+      score = calculate_with_cosine(posts0, posts1)
+      if score >= THRESHOLD
+        set.add(Element.new(uid, score))
+      end
     end
 
     set.first(limit)

app/models/post_vote.rb

@@ -9,7 +9,7 @@ class PostVote < ActiveRecord::Base
   after_destroy :update_post_on_destroy
 
   def self.prune!
-    where("created_at < ?", 30.days.ago).delete_all
+    where("created_at < ?", 90.days.ago).delete_all
   end
 
   def self.positive_user_ids

app/views/anti_voters/index.html.erb

@@ -1,15 +0,0 @@
-<div id="c-super-voters">
-  <div id="a-index">
-    <h1>Anti Voters</h1>
-
-    <ul>
-      <% @anti_voters.each do |anti_voter| %>
-        <li><%= link_to_if CurrentUser.user.is_janitor?, anti_voter.user.name, posts_path(tags: "upvote:#{anti_voter.user.name}") %></li>
-      <% end %>
-    </ul>
-  </div>
-</div>
-
-<% content_for(:page_title) do %>
-  Anti Voters - <%= Danbooru.config.app_name %>
-<% end %>

config/routes.rb

@@ -71,7 +71,6 @@ Rails.application.routes.draw do
     resources :hits, :controller => "advertisement_hits", :only => [:create]
   end
   resources :api_keys, :only => [:new, :create]
-  resources :anti_voters, :only => [:index]
   resources :artists do
     member do
       put :revert