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index.js
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index.js
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/*
openRerity core algorithm JS implementation
use sky personal js lib
https://github.com/kongnet/meeko
*/
const $ = require('meeko')
const utils = require('./lib/utils')
function tokenScore (metaObj, blankTrait = '__undefined') {
// Create trait value map without undefined(blank) trait
let traitMap = {}
metaObj.forEach(x => {
for (let i in x) {
!traitMap[i] && (traitMap[i] = [])
x[i] = x[i].trim()
traitMap[i].push(x[i])
}
})
// Create all trait list
let traitList = Object.keys(traitMap)
// Create undefined(blank) trait for every token
metaObj.forEach(x => {
// NOTICE: undefined to '__undefined',if trait value is '__undefined',be careful
// use meeko sets except
traitList.except(Object.keys(x)).forEach(x => traitMap[x].push(blankTrait))
})
// Create trait value stats include traitEntropy
let traitMapStat = {}
let traitEntropyList = []
for (let i in traitMap) {
// use meeko stats function
traitMap[i].countAdv().map(x => {
!traitMapStat[i] && (traitMapStat[i] = {})
traitMapStat[i][x.k] = x.w
traitEntropyList.push(x.w)
})
}
// Create token trait probability list
let traitInfoList = []
metaObj.forEach(i => {
traitInfoList.push(
traitList.map(x => {
return i[x] ? traitMapStat[x][i[x]] : traitMapStat[x][blankTrait]
})
)
})
let entropySum = utils.entropy(traitEntropyList)
let r = traitInfoList
.map((x, i) => {
return { v: utils.infoContent(x) / entropySum, toeknId: i }
})
.orderBy(['v'], ['desc'])
// same rank solution
let rankNum = 0
for (let i = 0; i < r.length; i++) {
rankNum++
if (r[i].v === r[i - 1]?.v) {
rankNum--
}
r[i].rank = rankNum
}
return r
}
module.exports = tokenScore