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improve: improved rating algorithm wip

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anuraghazra 2020-07-14 14:08:57 +05:30
parent cbd0e583ff
commit 2658a8737d
2 changed files with 61 additions and 20 deletions
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79
src/calculateRank.js
View File

@ -1,3 +1,21 @@
// https://stackoverflow.com/a/5263759/10629172
function normalcdf(mean, sigma, to) {
var z = (to - mean) / Math.sqrt(2 * sigma * sigma);
var t = 1 / (1 + 0.3275911 * Math.abs(z));
var a1 = 0.254829592;
var a2 = -0.284496736;
var a3 = 1.421413741;
var a4 = -1.453152027;
var a5 = 1.061405429;
var erf =
1 - ((((a5 * t + a4) * t + a3) * t + a2) * t + a1) * t * Math.exp(-z * z);
var sign = 1;
if (z < 0) {
sign = -1;
}
return (1 / 2) * (1 + sign * erf);
}
function calculateRank({
totalRepos,
totalCommits,
@ -13,12 +31,24 @@ function calculateRank({
const STARS_OFFSET = 0.75;
const PRS_OFFSET = 0.5;
const FOLLOWERS_OFFSET = 0.45;
const REPO_OFFSET = 1;
const FIRST_STEP = 0;
const SECOND_STEP = 5;
const THIRD_STEP = 20;
const FOURTH_STEP = 50;
const FIFTH_STEP = 130;
const ALL_OFFSETS =
CONTRIBS_OFFSET +
ISSUES_OFFSET +
STARS_OFFSET +
PRS_OFFSET +
FOLLOWERS_OFFSET +
REPO_OFFSET;
const RANK_S_VALUE = 1;
const RANK_DOUBLE_A_VALUE = 25;
const RANK_A2_VALUE = 45;
const RANK_A3_VALUE = 60;
const RANK_B_VALUE = 100;
const TOTAL_VALUES =
RANK_S_VALUE + RANK_A2_VALUE + RANK_A3_VALUE + RANK_B_VALUE;
// prettier-ignore
const score = (
@ -27,26 +57,37 @@ function calculateRank({
issues * ISSUES_OFFSET +
stargazers * STARS_OFFSET +
prs * PRS_OFFSET +
followers * FOLLOWERS_OFFSET
) / totalRepos;
followers * FOLLOWERS_OFFSET +
totalRepos * REPO_OFFSET
) / 100;
const normalizedScore = normalcdf(score, TOTAL_VALUES, ALL_OFFSETS) * 100;
let level = "";
if (score == FIRST_STEP) {
level = "B";
} else if (score > FIRST_STEP && score <= SECOND_STEP) {
level = "B+";
} else if (score > SECOND_STEP && score <= THIRD_STEP) {
level = "A";
} else if (score > THIRD_STEP && score <= FOURTH_STEP) {
level = "A+";
} else if (score > FOURTH_STEP && score <= FIFTH_STEP) {
level = "A++";
} else if (score > FIFTH_STEP) {
if (normalizedScore < RANK_S_VALUE) {
level = "S+";
}
if (
normalizedScore >= RANK_S_VALUE &&
normalizedScore < RANK_DOUBLE_A_VALUE
) {
level = "S";
}
if (
normalizedScore >= RANK_DOUBLE_A_VALUE &&
normalizedScore < RANK_A2_VALUE
) {
level = "A++";
}
if (normalizedScore >= RANK_A2_VALUE && normalizedScore < RANK_A3_VALUE) {
level = "A+";
}
if (normalizedScore >= RANK_A3_VALUE && normalizedScore < RANK_B_VALUE) {
level = "B+";
}
return { level, score };
return { level, score: normalizedScore };
}
module.exports = calculateRank;

2
tests/calculateRank.test.js
View File

@ -13,6 +13,6 @@ describe("Test calculateRank", () => {
prs: 300,
issues: 200,
})
).toStrictEqual({ level: "S+", score: 192.13 });
).toStrictEqual({ level: "A+", score: 49.16605417270399 });
});
});