TrueSkill examples

app.js

var readline = require('readline').createInterface({
    input: process.stdin,
    output: process.stdout
});

var trueskill = require('com.izaakschroeder.trueskill').create(1000);

console.log('mu: %d, sigma: %d, beta: %d, tau: %d',
    trueskill.mu.toFixed(3), 
    trueskill.sigma.toFixed(3), 
    trueskill.beta.toFixed(3), 
    trueskill.tau.toFixed(3));

var p1 = { name: 'Justin',
           rating: trueskill.createRating()
         };
var p2 = { name: 'James',
           rating: trueskill.createRating()
         };
var p3 = { name: 'Garth',
           rating: trueskill.createRating()
         };

function playMatch(players, results) {
    var teams = players.map(function(player) { return [player.rating] });
    newRatings = trueskill.update(teams, results);
    players.forEach(function (player, i) {
        player.rating = newRatings[i][0];
    });
}

console.log('Initial ratings: %s: (%d %d), %s: (%d %d), %s: (%d %d)',
    p1.name, p1.rating.mu.toFixed(3), p1.rating.sigma.toFixed(3),
    p2.name, p2.rating.mu.toFixed(3), p2.rating.sigma.toFixed(3),
    p3.name, p3.rating.mu.toFixed(3), p3.rating.sigma.toFixed(3));

// Justin vs. James - W:9, D:9, L:2
playMatch([p1, p2], [0,1]);
playMatch([p1, p2], [0,0]);
playMatch([p1, p2], [1,0]);
playMatch([p1, p2], [0,1]);
playMatch([p1, p2], [0,1]);
playMatch([p1, p2], [0,1]);
playMatch([p1, p2], [0,1]);
playMatch([p1, p2], [0,0]);
playMatch([p1, p2], [0,0]);
playMatch([p1, p2], [0,0]);
playMatch([p1, p2], [1,0]);
playMatch([p1, p2], [0,1]);
playMatch([p1, p2], [0,1]);
playMatch([p1, p2], [0,1]);
playMatch([p1, p2], [0,0]);
playMatch([p1, p2], [0,0]);
playMatch([p1, p2], [0,0]);
playMatch([p1, p2], [0,0]);
playMatch([p1, p2], [0,0]);
playMatch([p1, p2], [0,1]);

// Justin vs. Garth - W:4, D:12, L:4
playMatch([p1, p3], [0,0]);
playMatch([p1, p3], [0,0]);
playMatch([p1, p3], [1,0]);
playMatch([p1, p3], [0,0]);
playMatch([p1, p3], [0,1]);
playMatch([p1, p3], [0,0]);
playMatch([p1, p3], [1,0]);
playMatch([p1, p3], [0,0]);
playMatch([p1, p3], [0,0]);
playMatch([p1, p3], [0,1]);
playMatch([p1, p3], [1,0]);
playMatch([p1, p3], [0,0]);
playMatch([p1, p3], [0,0]);
playMatch([p1, p3], [0,1]);
playMatch([p1, p3], [0,0]);
playMatch([p1, p3], [1,0]);
playMatch([p1, p3], [0,0]);
playMatch([p1, p3], [0,0]);
playMatch([p1, p3], [0,0]);
playMatch([p1, p3], [0,1]);

// James vs. Garth - W:3, D:7, L:10
playMatch([p2, p3], [1,0]);
playMatch([p2, p3], [1,0]);
playMatch([p2, p3], [1,0]);
playMatch([p2, p3], [1,0]);
playMatch([p2, p3], [1,0]);
playMatch([p2, p3], [1,0]);
playMatch([p2, p3], [1,0]);
playMatch([p2, p3], [0,0]);
playMatch([p2, p3], [0,1]);
playMatch([p2, p3], [0,0]);
playMatch([p2, p3], [1,0]);
playMatch([p2, p3], [1,0]);
playMatch([p2, p3], [0,1]);
playMatch([p2, p3], [0,1]);
playMatch([p2, p3], [0,0]);
playMatch([p2, p3], [0,0]);
playMatch([p2, p3], [0,0]);
playMatch([p2, p3], [1,0]);
playMatch([p2, p3], [0,0]);
playMatch([p2, p3], [0,0]);

console.log('Final ratings: %s: (%d %d), %s: (%d %d), %s: (%d %d)',
    p1.name, p1.rating.mu.toFixed(3), p1.rating.sigma.toFixed(3),
    p2.name, p2.rating.mu.toFixed(3), p2.rating.sigma.toFixed(3),
    p3.name, p3.rating.mu.toFixed(3), p3.rating.sigma.toFixed(3));

readline.question("Press any key to exit...", 
        function (_) { readline.close(); });

main.py

#! python

import trueskill
from trueskill import Rating, rate_1vs1

mu    = 1000
sigma = mu/3
beta  = sigma/2
tau   = sigma/100

print('mu: %.3f, sigma: %.3f, beta: %.3f, tau: %.3f' %
      (mu, sigma, beta, tau))

trueskill.setup(mu, sigma, beta, tau)

justin,james,garth = Rating(), Rating(), Rating()

print('Initial ratings: Justin: (%.3f %.3f), James: (%.3f %.3f), Garth: (%.3f %.3f)'
      % (justin.mu, justin.sigma, james.mu, james.sigma, garth.mu, garth.sigma))

# Justin vs. James - W:9, D:9, L:2
justin,james = rate_1vs1(justin, james)
justin,james = rate_1vs1(justin, james, drawn=True)
james,justin = rate_1vs1(james, justin)
justin,james = rate_1vs1(justin, james)
justin,james = rate_1vs1(justin, james)
justin,james = rate_1vs1(justin, james)
justin,james = rate_1vs1(justin, james)
justin,james = rate_1vs1(justin, james, drawn=True)
justin,james = rate_1vs1(justin, james, drawn=True)
justin,james = rate_1vs1(justin, james, drawn=True)
james,justin = rate_1vs1(james, justin)
justin,james = rate_1vs1(justin, james)
justin,james = rate_1vs1(justin, james)
justin,james = rate_1vs1(justin, james)
justin,james = rate_1vs1(justin, james, drawn=True)
justin,james = rate_1vs1(justin, james, drawn=True)
justin,james = rate_1vs1(justin, james, drawn=True)
justin,james = rate_1vs1(justin, james, drawn=True)
justin,james = rate_1vs1(justin, james, drawn=True)
justin,james = rate_1vs1(justin, james)

# Justin vs. Garth - W:4, D:12, L:4
justin,garth = rate_1vs1(justin, garth, drawn=True)
justin,garth = rate_1vs1(justin, garth, drawn=True)
garth,justin = rate_1vs1(garth, justin)
justin,garth = rate_1vs1(justin, garth, drawn=True)
justin,garth = rate_1vs1(justin, garth)
justin,garth = rate_1vs1(justin, garth, drawn=True)
garth,justin = rate_1vs1(garth, justin)
justin,garth = rate_1vs1(justin, garth, drawn=True)
justin,garth = rate_1vs1(justin, garth, drawn=True)
justin,garth = rate_1vs1(justin, garth)
garth,justin = rate_1vs1(garth, justin)
justin,garth = rate_1vs1(justin, garth, drawn=True)
justin,garth = rate_1vs1(justin, garth, drawn=True)
justin,garth = rate_1vs1(justin, garth)
justin,garth = rate_1vs1(justin, garth, drawn=True)
garth,justin = rate_1vs1(garth, justin)
justin,garth = rate_1vs1(justin, garth, drawn=True)
justin,garth = rate_1vs1(justin, garth, drawn=True)
justin,garth = rate_1vs1(justin, garth, drawn=True)
justin,garth = rate_1vs1(justin, garth)

# James vs. Garth - W:3, D:7, L:10
garth,james = rate_1vs1(garth,james)
garth,james = rate_1vs1(garth,james)
garth,james = rate_1vs1(garth,james)
garth,james = rate_1vs1(garth,james)
garth,james = rate_1vs1(garth,james)
garth,james = rate_1vs1(garth,james)
garth,james = rate_1vs1(garth,james)
james,garth = rate_1vs1(james, garth, drawn=True)
james,garth = rate_1vs1(james, garth)
james,garth = rate_1vs1(james, garth, drawn=True)
garth,james = rate_1vs1(garth,james)
garth,james = rate_1vs1(garth,james)
james,garth = rate_1vs1(james, garth)
james,garth = rate_1vs1(james, garth)
james,garth = rate_1vs1(james, garth, drawn=True)
james,garth = rate_1vs1(james, garth, drawn=True)
james,garth = rate_1vs1(james, garth, drawn=True)
garth,james = rate_1vs1(garth,james)
james,garth = rate_1vs1(james, garth, drawn=True)
james,garth = rate_1vs1(james, garth, drawn=True)

print('Final ratings: Justin: (%.3f %.3f), James: (%.3f %.3f), Garth: (%.3f %.3f)'
      % (justin.mu, justin.sigma, james.mu, james.sigma, garth.mu, garth.sigma))