Tweak feed algorithm

common/recommended-contracts.ts

@@ -119,21 +119,27 @@ export const getWordScores = (
 
       const factor =
         -1 * Math.log(viewCount + 1) +
-        3 * Math.log(clickCount + 1) +
-        10 * Math.log(betCount + 1)
+        10 * Math.log(betCount + clickCount / 4 + 1)
 
       return _.mapValues(wordsTfIdf, (tfIdf) => tfIdf * factor)
     }
   )
 
   const wordScores = Object.values(contractWordScores).reduce(addObjects, {})
-
-  console.log(
-    'your word scores',
-    _.sortBy(_.toPairs(wordScores), ([, score]) => -score).slice(0, 10)
+  const minScore = Math.min(...Object.values(wordScores))
+  const maxScore = Math.max(...Object.values(wordScores))
+  const normalizedWordScores = _.mapValues(
+    wordScores,
+    (score) => (score - minScore) / (maxScore - minScore)
   )
 
-  return wordScores
+  // console.log(
+  //   'your word scores',
+  //   _.sortBy(_.toPairs(normalizedWordScores), ([, score]) => -score).slice(0, 100),
+  //   _.sortBy(_.toPairs(normalizedWordScores), ([, score]) => -score).slice(-100)
+  // )
+
+  return normalizedWordScores
 }
 
 export function getContractScores(
@@ -149,10 +155,23 @@ export function getContractScores(
       return wordFreq * weight
     })
 
-    return [contract.id, score] as [string, number]
+    return [contract, score] as [Contract, number]
   })
 
-  return _.fromPairs(scorePairs)
+  /*
+  const questionPairs = _.sortBy(
+    scorePairs.map(
+      ([contract, score]) => [contract.question, score] as [string, number]
+    ),
+    ([, score]) => -score
+  )
+
+  console.log('score', questionPairs.slice(0, 100), questionPairs.slice(-100))
+  */
+
+  return _.fromPairs(
+    scorePairs.map(([contract, score]) => [contract.id, score])
+  )
 }
 
 // Caluculate Term Frequency-Inverse Document Frequency (TF-IDF):

functions/src/scripts/update-feed.ts

@@ -21,7 +21,10 @@ async function updateFeed() {
 
   const contracts = await getValues<Contract>(firestore.collection('contracts'))
   const feedContracts = await getFeedContracts()
-  const users = await getValues<User>(firestore.collection('users'))
+  const users = await getValues<User>(
+    firestore.collection('users')
+    //.where('username', '==', 'JamesGrugett')
+  )
 
   await batchedWaitAll(
     users.map((user) => async () => {

functions/src/update-user-feed.ts

@@ -18,7 +18,7 @@ import { batchedWaitAll } from '../../common/util/promise'
 
 const firestore = admin.firestore()
 
-const MAX_FEED_CONTRACTS = 60
+const MAX_FEED_CONTRACTS = 75
 
 export const updateUserFeed = functions.pubsub
   .schedule('every 60 minutes')
@@ -119,9 +119,14 @@ function getActivityScore(contract: Contract, viewTime: number | undefined) {
     lastCommentTime && (!viewTime || lastCommentTime > viewTime)
   const newCommentScore = hasNewComments ? 1 : 0.5
 
+  const timeSinceLastComment = Date.now() - (lastCommentTime ?? createdTime)
+  const commentDaysAgo = timeSinceLastComment / DAY_MS
+  const commentTimeScore =
+    0.25 + 0.75 * (1 - logInterpolation(0, 3, commentDaysAgo))
+
   const timeSinceLastBet = Date.now() - (lastBetTime ?? createdTime)
-  const daysAgo = timeSinceLastBet / DAY_MS
-  const betTimeScore = 1 - logInterpolation(0, 3, daysAgo)
+  const betDaysAgo = timeSinceLastBet / DAY_MS
+  const betTimeScore = 0.5 + 0.5 * (1 - logInterpolation(0, 3, betDaysAgo))
 
   let prob = 0.5
   if (outcomeType === 'BINARY') {
@@ -134,14 +139,12 @@ function getActivityScore(contract: Contract, viewTime: number | undefined) {
   const frac = 1 - Math.abs(prob - 0.5) ** 2 / 0.25
   const probScore = 0.5 + frac * 0.5
 
-  const { volume24Hours, volume7Days, volume } = contract
-  const combinedVolume =
-    Math.log(volume24Hours + 1) +
-    Math.log(volume7Days + 1) +
-    Math.log(volume + 1)
-  const volumeScore = 0.5 + 0.5 * logInterpolation(7, 35, combinedVolume)
+  const { volume24Hours, volume7Days } = contract
+  const combinedVolume = Math.log(volume24Hours + 1) + Math.log(volume7Days + 1)
+  const volumeScore = 0.5 + 0.5 * logInterpolation(4, 20, combinedVolume)
 
-  const score = newCommentScore * betTimeScore * probScore * volumeScore
+  const score =
+    newCommentScore * commentTimeScore * betTimeScore * probScore * volumeScore
 
   // Map score to [0.5, 1] since no recent activty is not a deal breaker.
   const mappedScore = 0.5 + 0.5 * score
@@ -160,11 +163,11 @@ function getLastViewedScore(viewTime: number | undefined) {
 
   if (daysAgo < 0.5) {
     const frac = logInterpolation(0, 0.5, daysAgo)
-    return 0.5 * frac
+    return 0.5 + 0.25 * frac
   }
 
   const frac = logInterpolation(0.5, 14, daysAgo)
-  return 0.5 + 0.5 * frac
+  return 0.75 + 0.25 * frac
 }
 
 async function getRecentBetsAndComments(contract: Contract) {