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improve trust

This commit is contained in:
keyan 2022-09-08 14:52:32 -05:00
parent 48990d5987
commit 1b6a7e7f95
1 changed files with 62 additions and 30 deletions
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92
worker/trust.js
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@ -12,6 +12,7 @@ function trust ({ boss, models }) {
// only explore a path up to this depth from start
const MAX_DEPTH = 6
const MAX_TRUST = 0.9
const MIN_SUCCESS = 5
// https://en.wikipedia.org/wiki/Normal_distribution#Quantile_function
const Z_CONFIDENCE = 2.326347874041 // 98% confidence
@ -162,39 +163,70 @@ function trustGivenGraph (graph, start) {
// return graph
// }
// upvote confidence graph
// old upvote confidence graph
// async function getGraph (models) {
// const [{ graph }] = await models.$queryRaw`
// select json_object_agg(id, hops) as graph
// from (
// select id, json_agg(json_build_object('node', oid, 'trust', trust)) as hops
// from (
// select s.id, s.oid, confidence(s.shared, count(*), ${Z_CONFIDENCE}) as trust
// from (
// select a."userId" as id, b."userId" as oid, count(*) as shared
// from "ItemAct" b
// join users bu on bu.id = b."userId"
// join "ItemAct" a on b."itemId" = a."itemId"
// join users au on au.id = a."userId"
// join "Item" on "Item".id = b."itemId"
// where b.act = 'VOTE'
// and a.act = 'VOTE'
// and "Item"."parentId" is null
// and "Item"."userId" <> b."userId"
// and "Item"."userId" <> a."userId"
// and b."userId" <> a."userId"
// and "Item".created_at >= au.created_at and "Item".created_at >= bu.created_at
// group by b."userId", a."userId") s
// join users u on s.id = u.id
// join users ou on s.oid = ou.id
// join "ItemAct" on "ItemAct"."userId" = s.oid
// join "Item" on "Item".id = "ItemAct"."itemId"
// where "ItemAct".act = 'VOTE' and "Item"."parentId" is null
// and "Item"."userId" <> s.oid and "Item"."userId" <> s.id
// and "Item".created_at >= u.created_at and "Item".created_at >= ou.created_at
// group by s.id, s.oid, s.shared
// ) a
// group by id
// ) b`
// return graph
// }
async function getGraph (models) {
const [{ graph }] = await models.$queryRaw`
select json_object_agg(id, hops) as graph
from (
select id, json_agg(json_build_object('node', oid, 'trust', trust)) as hops
from (
select s.id, s.oid, confidence(s.shared, count(*), ${Z_CONFIDENCE}) as trust
from (
select a."userId" as id, b."userId" as oid, count(*) as shared
from "ItemAct" b
join users bu on bu.id = b."userId"
join "ItemAct" a on b."itemId" = a."itemId"
join users au on au.id = a."userId"
join "Item" on "Item".id = b."itemId"
where b.act = 'VOTE'
and a.act = 'VOTE'
and "Item"."parentId" is null
and "Item"."userId" <> b."userId"
and "Item"."userId" <> a."userId"
and b."userId" <> a."userId"
and "Item".created_at >= au.created_at and "Item".created_at >= bu.created_at
group by b."userId", a."userId") s
join users u on s.id = u.id
join users ou on s.oid = ou.id
join "ItemAct" on "ItemAct"."userId" = s.oid
join "Item" on "Item".id = "ItemAct"."itemId"
where "ItemAct".act = 'VOTE' and "Item"."parentId" is null
and "Item"."userId" <> s.oid and "Item"."userId" <> s.id
and "Item".created_at >= u.created_at and "Item".created_at >= ou.created_at
group by s.id, s.oid, s.shared
SELECT json_object_agg(id, hops) AS graph
FROM (
SELECT id, json_agg(json_build_object('node', oid, 'trust', trust)) AS hops
FROM (
WITH user_votes AS (
SELECT "ItemAct"."userId" AS user_id, users.name AS name, "ItemAct"."itemId" AS item_id, "ItemAct".created_at AS act_at,
users.created_at AS user_at, "Item".created_at AS item_at, count(*) OVER (partition by "ItemAct"."userId") AS user_vote_count
FROM "ItemAct"
JOIN "Item" ON "Item".id = "ItemAct"."itemId" AND "ItemAct".act = 'VOTE' AND "Item"."parentId" IS NULL
JOIN users ON "ItemAct"."userId" = users.id
),
user_pair AS (
SELECT a.user_id AS a_id, a.name AS a_name, b.user_id AS b_id, b.name AS b_name,
count(*) FILTER(WHERE a.act_at > b.act_at) AS before,
count(*) FILTER(WHERE b.act_at > a.act_at) AS after,
CASE WHEN b.user_at > a.user_at THEN b.user_vote_count ELSE a.user_vote_count END AS total
FROM user_votes a
JOIN user_votes b ON a.item_id = b.item_id
GROUP BY a.user_id, a.name, a.user_at, a.user_vote_count, b.user_id, b.name, b.user_at, b.user_vote_count
)
SELECT a_id AS id, a_name, b_id AS oid, b_name, confidence(before, total - after, ${Z_CONFIDENCE}) AS trust, before, after, total
FROM user_pair
WHERE before >= ${MIN_SUCCESS}
) a
group by id
GROUP BY a.id
) b`
return graph
}