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added that users would only get exercises recommended which are max 1 level more difficult

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This commit is contained in:
Thomas Hille
2017-02-26 17:46:37 +01:00
parent 1d75af51d2
commit f63b9eeb3c
1 changed files with 22 additions and 3 deletions
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25
app/models/proxy_exercise.rb
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@ -83,17 +83,36 @@ class ProxyExercise < ActiveRecord::Base
max_topic_knowledge_ratio = potex.expected_difficulty * tag_ratio max_topic_knowledge_ratio = potex.expected_difficulty * tag_ratio
old_relative_loss_tag = topic_knowledge_user[tag] / topic_knowledge_max[tag] 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) new_relative_loss_tag = topic_knowledge_user[tag] / (topic_knowledge_max[tag] + max_topic_knowledge_ratio)
puts "tag #{tag} old_relative_loss_tag #{old_relative_loss_tag}, new_relative_loss_tag #{new_relative_loss_tag}, min_loss_after_solving #{topic_knowledge_max[tag] + max_topic_knowledge_ratio} tag_ratio #{tag_ratio}" puts "tag #{tag} old_relative_loss_tag #{old_relative_loss_tag}, new_relative_loss_tag #{new_relative_loss_tag}, tag_ratio #{tag_ratio}"
relative_knowledge_improvement[potex] += old_relative_loss_tag - new_relative_loss_tag relative_knowledge_improvement[potex] += old_relative_loss_tag - new_relative_loss_tag
end end
end end
highest_difficulty_user_has_accessed = exercisesUserHasAccessed.map{|e| e.expected_difficulty}.sort.last || 0
best_matching_exercise = relative_knowledge_improvement.max_by{|k,v| v}.first best_matching_exercise = find_best_exercise(relative_knowledge_improvement, highest_difficulty_user_has_accessed)
#best_matching_exercise = relative_knowledge_improvement.max_by{|k,v| v}.first
Rails.logger.info("current users knowledge loss: " + current_users_knowledge_lack.map{|k,v| "#{k} => #{v}"}.to_s) Rails.logger.info("current users knowledge loss: " + current_users_knowledge_lack.map{|k,v| "#{k} => #{v}"}.to_s)
Rails.logger.info("relative improvements #{relative_knowledge_improvement.map{|k,v| k.id.to_s + ':' + v.to_s}}") Rails.logger.info("relative improvements #{relative_knowledge_improvement.map{|k,v| k.id.to_s + ':' + v.to_s}}")
best_matching_exercise best_matching_exercise
end end
def find_best_exercise(relative_knowledge_improvement, highest_difficulty_user_has_accessed)
Rails.logger.info("select most appropiate exercise for user. his highest difficulty was #{highest_difficulty_user_has_accessed}")
sorted_exercises = relative_knowledge_improvement.sort_by{|k,v| v}.reverse
sorted_exercises.each do |ex,diff|
Rails.logger.info("review exercise #{ex.id} diff: #{ex.expected_difficulty}")
if (ex.expected_difficulty - highest_difficulty_user_has_accessed) <= 1
Rails.logger.info("matched #{ex.id}")
return ex
else
Rails.logger.info("ex #{ex.id} is too difficult")
end
end
easiest_exercise = sorted_exercises.min_by{|k,v| v}.first
Rails.logger.info("no match, select easiest exercise as fallback #{easiest_exercise.id}")
easiest_exercise
end
# [score][quantile] # [score][quantile]
def scoring_matrix def scoring_matrix
[ [