Class: Saulabs::TrueSkill::Factors::Likelihood

Inherits:
Base
  • Object
show all
Defined in:
lib/saulabs/trueskill/factors/likelihood.rb

Instance Method Summary collapse

Methods inherited from Base

#bind, #message_count, #reset_marginals, #send_message_at

Constructor Details

#initialize(beta_squared, variable1, variable2) ⇒ Likelihood

Returns a new instance of Likelihood.



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# File 'lib/saulabs/trueskill/factors/likelihood.rb', line 10

def initialize(beta_squared, variable1, variable2)
  super()
  @precision = 1.0 / beta_squared
  bind(variable1)
  bind(variable2)
end

Instance Method Details

#log_normalization ⇒ Object 



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# File 'lib/saulabs/trueskill/factors/likelihood.rb', line 25

def log_normalization
  Gauss::Distribution.log_ratio_normalization(@variables[0], @messages[0])
end

#update_message_at(index) ⇒ Object 



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# File 'lib/saulabs/trueskill/factors/likelihood.rb', line 17

def update_message_at(index)
  raise "illegal message index: #{index}" if index < 0 || index > 1
  case index
  when 0 then update_helper(@messages[0], @messages[1], @variables[0], @variables[1])
  when 1 then update_helper(@messages[1], @messages[0], @variables[1], @variables[0])
  end
end