Change trending statuses to only show one status from each account (#18181)
Calculate trends in temporary sets to avoid having to manage items that go below the decay threshold while not having any moments where a half-processed set is accessible to end-users
This commit is contained in:
Eugen Rochko
GitHub
parent
5c691430e5
commit
6476f7e4da
app/models/trends
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@ -64,33 +64,38 @@ class Trends::Base
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redis.expire(used_key(at_time), 1.day.seconds)
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end
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def trim_older_items
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redis.zremrangebyscore("#{key_prefix}:all", '-inf', '(0.3')
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redis.zremrangebyscore("#{key_prefix}:allowed", '-inf', '(0.3')
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end
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def score_at_rank(rank)
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redis.zrevrange("#{key_prefix}:allowed", 0, rank, with_scores: true).last&.last || 0
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end
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# @param [Integer] id
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# @param [Float] score
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# @param [Hash<String, Boolean>] subsets
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def add_to_and_remove_from_subsets(id, score, subsets = {})
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subsets.each_key do |subset|
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key = [key_prefix, subset].compact.join(':')
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def replace_items(suffix, items)
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tmp_prefix = "#{key_prefix}:tmp:#{SecureRandom.alphanumeric(6)}#{suffix}"
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allowed_items = filter_for_allowed_items(items)
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if score.positive? && subsets[subset]
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redis.zadd(key, score, id)
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else
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redis.zrem(key, id)
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end
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redis.pipelined do |pipeline|
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items.each { |item| pipeline.zadd("#{tmp_prefix}:all", item[:score], item[:item].id) }
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allowed_items.each { |item| pipeline.zadd("#{tmp_prefix}:allowed", item[:score], item[:item].id) }
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rename_set(pipeline, "#{tmp_prefix}:all", "#{key_prefix}:all#{suffix}", items)
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rename_set(pipeline, "#{tmp_prefix}:allowed", "#{key_prefix}:allowed#{suffix}", allowed_items)
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end
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end
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def filter_for_allowed_items(items)
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raise NotImplementedError
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end
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private
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def used_key(at_time)
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"#{key_prefix}:used:#{at_time.beginning_of_day.to_i}"
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end
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def rename_set(pipeline, from_key, to_key, set_items)
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if set_items.empty?
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pipeline.del(to_key)
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else
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pipeline.rename(from_key, to_key)
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end
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end
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end
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@ -8,14 +8,15 @@ class Trends::Links < Trends::Base
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review_threshold: 3,
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max_score_cooldown: 2.days.freeze,
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max_score_halflife: 8.hours.freeze,
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decay_threshold: 1,
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}
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def register(status, at_time = Time.now.utc)
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original_status = status.reblog? ? status.reblog : status
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original_status = status.proper
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return unless original_status.public_visibility? && status.public_visibility? &&
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!original_status.account.silenced? && !status.account.silenced? &&
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!original_status.spoiler_text?
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return unless (original_status.public_visibility? && status.public_visibility?) &&
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!(original_status.account.silenced? || status.account.silenced?) &&
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!(original_status.spoiler_text? || original_status.sensitive?)
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original_status.preview_cards.each do |preview_card|
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add(preview_card, status.account_id, at_time) if preview_card.appropriate_for_trends?
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@ -61,6 +62,9 @@ class Trends::Links < Trends::Base
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private
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def calculate_scores(preview_cards, at_time)
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global_items = []
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locale_items = Hash.new { |h, key| h[key] = [] }
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preview_cards.each do |preview_card|
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expected = preview_card.history.get(at_time - 1.day).accounts.to_f
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expected = 1.0 if expected.zero?
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@ -87,33 +91,23 @@ class Trends::Links < Trends::Base
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decaying_score = max_score * (0.5**((at_time.to_f - max_time.to_f) / options[:max_score_halflife].to_f))
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add_to_and_remove_from_subsets(preview_card.id, decaying_score, {
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all: true,
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allowed: preview_card.trendable?,
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})
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next unless decaying_score >= options[:decay_threshold]
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next unless valid_locale?(preview_card.language)
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add_to_and_remove_from_subsets(preview_card.id, decaying_score, {
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"all:#{preview_card.language}" => true,
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"allowed:#{preview_card.language}" => preview_card.trendable?,
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})
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global_items << { score: decaying_score, item: preview_card }
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locale_items[preview_card.language] << { score: decaying_score, item: preview_card } if valid_locale?(preview_card.language)
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end
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trim_older_items
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replace_items('', global_items)
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# Clean up localized sets by calculating the intersection with the main
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# set. We do this instead of just deleting the localized sets to avoid
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# having moments where the API returns empty results
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redis.pipelined do
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Trends.available_locales.each do |locale|
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redis.zinterstore("#{key_prefix}:all:#{locale}", ["#{key_prefix}:all:#{locale}", "#{key_prefix}:all"], aggregate: 'max')
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redis.zinterstore("#{key_prefix}:allowed:#{locale}", ["#{key_prefix}:allowed:#{locale}", "#{key_prefix}:allowed"], aggregate: 'max')
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end
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Trends.available_locales.each do |locale|
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replace_items(":#{locale}", locale_items[locale])
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end
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end
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def filter_for_allowed_items(items)
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items.select { |item| item[:item].trendable? }
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end
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def would_be_trending?(id)
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score(id) > score_at_rank(options[:review_threshold] - 1)
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end
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@ -7,6 +7,7 @@ class Trends::Statuses < Trends::Base
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threshold: 5,
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review_threshold: 3,
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score_halflife: 2.hours.freeze,
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decay_threshold: 0.3,
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}
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class Query < Trends::Query
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@ -31,7 +32,7 @@ class Trends::Statuses < Trends::Base
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end
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def register(status, at_time = Time.now.utc)
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add(status.proper, status.account_id, at_time) if eligible?(status)
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add(status.proper, status.account_id, at_time) if eligible?(status.proper)
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end
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def add(status, _account_id, at_time = Time.now.utc)
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@ -74,53 +75,45 @@ class Trends::Statuses < Trends::Base
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private
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def eligible?(status)
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original_status = status.proper
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original_status.public_visibility? &&
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original_status.account.discoverable? && !original_status.account.silenced? &&
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original_status.spoiler_text.blank? && !original_status.sensitive? && !original_status.reply?
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status.public_visibility? && status.account.discoverable? && !status.account.silenced? && status.spoiler_text.blank? && !status.sensitive? && !status.reply?
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end
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def calculate_scores(statuses, at_time)
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redis.pipelined do
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statuses.each do |status|
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expected = 1.0
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observed = (status.reblogs_count + status.favourites_count).to_f
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global_items = []
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locale_items = Hash.new { |h, key| h[key] = [] }
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score = begin
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if expected > observed || observed < options[:threshold]
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0
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else
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((observed - expected)**2) / expected
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end
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statuses.each do |status|
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expected = 1.0
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observed = (status.reblogs_count + status.favourites_count).to_f
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score = begin
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if expected > observed || observed < options[:threshold]
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0
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else
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((observed - expected)**2) / expected
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end
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decaying_score = score * (0.5**((at_time.to_f - status.created_at.to_f) / options[:score_halflife].to_f))
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add_to_and_remove_from_subsets(status.id, decaying_score, {
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all: true,
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allowed: status.trendable? && status.account.discoverable?,
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})
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next unless valid_locale?(status.language)
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add_to_and_remove_from_subsets(status.id, decaying_score, {
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"all:#{status.language}" => true,
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"allowed:#{status.language}" => status.trendable? && status.account.discoverable?,
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})
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end
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trim_older_items
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decaying_score = score * (0.5**((at_time.to_f - status.created_at.to_f) / options[:score_halflife].to_f))
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# Clean up localized sets by calculating the intersection with the main
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# set. We do this instead of just deleting the localized sets to avoid
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# having moments where the API returns empty results
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next unless decaying_score >= options[:decay_threshold]
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Trends.available_locales.each do |locale|
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redis.zinterstore("#{key_prefix}:all:#{locale}", ["#{key_prefix}:all:#{locale}", "#{key_prefix}:all"], aggregate: 'max')
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redis.zinterstore("#{key_prefix}:allowed:#{locale}", ["#{key_prefix}:allowed:#{locale}", "#{key_prefix}:allowed"], aggregate: 'max')
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end
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global_items << { score: decaying_score, item: status }
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locale_items[status.language] << { account_id: status.account_id, score: decaying_score, item: status } if valid_locale?(status.language)
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end
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replace_items('', global_items)
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Trends.available_locales.each do |locale|
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replace_items(":#{locale}", locale_items[locale])
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end
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end
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def filter_for_allowed_items(items)
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# Show only one status per account, pick the one with the highest score
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# that's also eligible to trend
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items.group_by { |item| item[:account_id] }.values.filter_map { |account_items| account_items.select { |item| item[:item].trendable? && item[:item].account.discoverable? }.max_by { |item| item[:score] } }
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end
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def would_be_trending?(id)
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@ -8,6 +8,7 @@ class Trends::Tags < Trends::Base
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review_threshold: 3,
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max_score_cooldown: 2.days.freeze,
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max_score_halflife: 4.hours.freeze,
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decay_threshold: 1,
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}
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def register(status, at_time = Time.now.utc)
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@ -26,7 +27,6 @@ class Trends::Tags < Trends::Base
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def refresh(at_time = Time.now.utc)
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tags = Tag.where(id: (recently_used_ids(at_time) + currently_trending_ids(false, -1)).uniq)
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calculate_scores(tags, at_time)
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trim_older_items
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end
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def request_review
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@ -53,6 +53,8 @@ class Trends::Tags < Trends::Base
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private
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def calculate_scores(tags, at_time)
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items = []
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tags.each do |tag|
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expected = tag.history.get(at_time - 1.day).accounts.to_f
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expected = 1.0 if expected.zero?
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@ -79,11 +81,16 @@ class Trends::Tags < Trends::Base
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decaying_score = max_score * (0.5**((at_time.to_f - max_time.to_f) / options[:max_score_halflife].to_f))
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add_to_and_remove_from_subsets(tag.id, decaying_score, {
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all: true,
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allowed: tag.trendable?,
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})
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next unless decaying_score >= options[:decay_threshold]
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items << { score: decaying_score, item: tag }
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end
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replace_items('', items)
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end
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def filter_for_allowed_items(items)
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items.select { |item| item[:item].trendable? }
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end
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def would_be_trending?(id)
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