Module: Suggestor::Algorithms::RecommendationAlgorithm

Included in:
EuclideanDistance, PearsonCorrelation
Defined in:
lib/suggestor/algorithms/recommendation_algorithm.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#collection ⇒ Object

Returns the value of attribute collection.



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# File 'lib/suggestor/algorithms/recommendation_algorithm.rb', line 5

def collection
  @collection
end

Instance Method Details

#initialize(collection) ⇒ Object 



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# File 'lib/suggestor/algorithms/recommendation_algorithm.rb', line 7

def initialize(collection)
  @collection = collection
end

#no_shared_items_between?(first, second) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/suggestor/algorithms/recommendation_algorithm.rb', line 40

def no_shared_items_between?(first,second)
  shared_items_between(first,second).empty?
end

#recommented_related_items_for(main) ⇒ Object

returns recommended related items for the main user The most important feature. For example, a user will get movie recommendations based on his past movie reviews and how it compares with others



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# File 'lib/suggestor/algorithms/recommendation_algorithm.rb', line 30

def recommented_related_items_for(main)

  @similarities = @totals = Hash.new(0)
  @main = main

  create_similarities_totals
  generate_rankings

end

#shared_items_between(first, second) ⇒ Object 



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# File 'lib/suggestor/algorithms/recommendation_algorithm.rb', line 44

def shared_items_between(first,second)
  return [] unless values_for(first) && values_for(second)         
  related_keys_for(first).select do |item| 
    related_keys_for(second).include? item
  end
end

#similar_items_to(main) ⇒ Object

returns similar items based on their similary score for example, similar users based on their movies reviews



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# File 'lib/suggestor/algorithms/recommendation_algorithm.rb', line 13

def similar_items_to(main)

  #just compare those whore aren't the main item
  compare_to = collection.dup
  compare_to.delete(main)

  # return results based on their score
  compare_to.keys.inject({}) do |result, other|
    result.merge!({other => similarity_score_between(main,other)})
  end

end