StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics
https://doi.org/10.1109/TVCG.2020.3030352
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86 lines
1.4 KiB
86 lines
1.4 KiB
4 years ago
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"use strict"
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var pool = require("typedarray-pool")
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var inverse = require("invert-permutation")
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function rank(permutation) {
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var n = permutation.length
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switch(n) {
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case 0:
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case 1:
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return 0
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case 2:
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return permutation[1]
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default:
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break
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}
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var p = pool.mallocUint32(n)
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var pinv = pool.mallocUint32(n)
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var r = 0, s, t, i
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inverse(permutation, pinv)
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for(i=0; i<n; ++i) {
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p[i] = permutation[i]
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}
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for(i=n-1; i>0; --i) {
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t = pinv[i]
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s = p[i]
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p[i] = p[t]
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p[t] = s
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pinv[i] = pinv[s]
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pinv[s] = t
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r = (r + s) * i
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}
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pool.freeUint32(pinv)
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pool.freeUint32(p)
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return r
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}
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function unrank(n, r, p) {
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switch(n) {
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case 0:
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if(p) { return p }
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return []
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case 1:
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if(p) {
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p[0] = 0
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return p
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} else {
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return [0]
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}
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case 2:
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if(p) {
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if(r) {
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p[0] = 0
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p[1] = 1
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} else {
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p[0] = 1
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p[1] = 0
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}
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return p
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} else {
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return r ? [0,1] : [1,0]
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}
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default:
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break
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}
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p = p || new Array(n)
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var s, t, i, nf=1
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p[0] = 0
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for(i=1; i<n; ++i) {
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p[i] = i
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nf = (nf*i)|0
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}
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for(i=n-1; i>0; --i) {
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s = (r / nf)|0
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r = (r - s * nf)|0
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nf = (nf / i)|0
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t = p[i]|0
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p[i] = p[s]|0
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p[s] = t|0
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}
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return p
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}
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exports.rank = rank
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exports.unrank = unrank
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