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recommendation also with lots of debugging messages looks promising

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Thomas Hille
2017-02-22 15:58:35 +01:00
parent 04c54549c5
commit 9bef1d8bb2
1 changed files with 11 additions and 4 deletions
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15
app/models/proxy_exercise.rb
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@ -62,23 +62,26 @@ class ProxyExercise < ActiveRecord::Base
def selectBestMatchingExercise(user, exercisesUserHasAccessed, potentialRecommendedExercises)
topic_knowledge_user_and_max = getUserKnowledgeAndMaxKnowledge(user, exercisesUserHasAccessed)
puts "topic_knowledge_user_and_max: #{topic_knowledge_user_and_max}"
puts "potentialRecommendedExercises: #{potentialRecommendedExercises.size}"
topic_knowledge_user = topic_knowledge_user_and_max[:user_topic_knowledge]
topic_knowledge_max = topic_knowledge_user_and_max[:max_topic_knowledge]
relative_knowledge_improvement = {}
potentialRecommendedExercises.each do |potex|
tags = potex.tags
relative_knowledge_improvement[potex] = 0.0
puts "potex #{potex}"
tags.each do |tag|
tag_ratio = potex.exercise_tags.where(tag: tag).first.factor / potex.exercise_tags.inject(0){|sum, et| sum += et.factor }
tag_ratio = potex.exercise_tags.where(tag: tag).first.factor.to_f / potex.exercise_tags.inject(0){|sum, et| sum += et.factor }.to_f
max_topic_knowledge_ratio = potex.expected_difficulty * tag_ratio
old_relative_loss_tag = topic_knowledge_user[tag] / topic_knowledge_max[tag]
new_relative_loss_tag = topic_knowledge_user[tag] / (topic_knowledge_max[tag] + max_topic_knowledge_ratio)
relative_knowledge_improvement[potex] += new_relative_loss_tag - old_relative_loss_tag
puts "tag #{tag} old_relative_loss_tag #{old_relative_loss_tag}, new_relative_loss_tag #{new_relative_loss_tag}, max_topic_knowledge_ratio #{max_topic_knowledge_ratio} tag_ratio #{tag_ratio}"
relative_knowledge_improvement[potex] += old_relative_loss_tag - new_relative_loss_tag
end
end
puts "relative improvements #{relative_knowledge_improvement}"
exercise_with_greatest_improvements = relative_knowledge_improvement.max_by{|k,v| v}
exercise_with_greatest_improvements
exercise_with_greatest_improvements.first
end
# [score][quantile]
@ -148,10 +151,14 @@ class ProxyExercise < ActiveRecord::Base
topic_knowledge_loss_user = all_used_tags.map{|t| [t, 0]}.to_h
topic_knowledge_max = all_used_tags.map{|t| [t, 0]}.to_h
exercises.each do |ex|
puts "exercise: #{ex}"
user_score_factor = score(user, ex)
ex.tags.each do |t|
tag_ratio = ex.exercise_tags.where(tag: t).first.factor / ex.exercise_tags.inject(0){|sum, et| sum += et.factor }
tag_ratio = ex.exercise_tags.where(tag: t).first.factor.to_f / ex.exercise_tags.inject(0){|sum, et| sum += et.factor }.to_f
puts "tag: #{t}, factor: #{ex.exercise_tags.where(tag: t).first.factor}, sumall: #{ex.exercise_tags.inject(0){|sum, et| sum += et.factor }}"
puts "tag_ratio #{tag_ratio}"
topic_knowledge_ratio = ex.expected_difficulty * tag_ratio
puts "topic_knowledge_ratio #{topic_knowledge_ratio}"
topic_knowledge_loss_user[t] += (1 - user_score_factor) * topic_knowledge_ratio
topic_knowledge_max[t] += topic_knowledge_ratio
end