TrueSkill Through Time

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• 19. dubna 2012 12:39

   

   
  

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  In TrueSkill Through Time, the player skills change each year, and they are coupled between consecutive years.  So you need to have a separate PlayerSkills array for every year, and repeat the whole model (performances, etc.) for each year, then link the years.  The trickiest bit is linking the years.  Each player has a year where they first started playing.  In that year, their skill comes from the prior, otherwise their skill is drawn from a Gaussian around the previous year's skill.  Since this differs for each player, you have to use a Variable.If statement to branch on whether this is the first year for a player, and generate their skill value appropriately.  So the code becomes something like this:

  Variable<bool> isFirstYear = (firstYear[player] >= year);
  using (Variable.If(isFirstYear)) {
    skillInYear[year][player] = Variable<double>.Random(skillPrior);
  }
  using (Variable.IfNot(isFirstYear)) {
    skillInYear[year][player] = Variable.GaussianFromMeanAndPrecision(skillInYear[year-1][player], skillChangePrecision);
  }

  
  
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