Class: CollaborativeFilter

Inherits:
Object
  • Object
show all
Defined in:
lib/correlators/simple_svd.rb,
lib/collaborative_filter.rb,
lib/boosters/simple_booster.rb,
lib/collaborative_filter/config.rb,
lib/collaborative_filter/output.rb,
lib/collaborative_filter/data_set.rb,
lib/recommenders/simplest_recommender.rb,
lib/collaborative_filter/content_booster.rb,
lib/collaborative_filter/output/yaml_adapter.rb,
lib/collaborative_filter/output/mysql_adapter.rb

Overview

SimpleBooster - a content booster for CollaborativeFiltration

The purpose of a content booster is to improve the purely collaborative output from a recommender. Collaborative filtration relies on the idea that if you have similar ratings/purchases as someone else in the past, you are likely to continue to in the future.

The fallacy of this is obvious when you consider that Bob may really enjoy Superhero comics and Horror comics. Joe really enjoys Superhero comics and Humor comics. Depending on how many things they rate and other factors, Joe and Bob may still have a high correlation. However, Bob’s love of Horror comics may infiltrate Joe’s ratings despite the fact that Joe really dislikes them.

So, a content booster allows us to nudge the value of your recommendations up or down. One strategy for using a content booster is to set the threshold on your recommender low (say… 2.5 or 3), but the threshold on the content booster high.

Defined Under Namespace

Classes: Config, ContentBooster, DataSet, Output, SimpleBooster, SimpleSvd, SimplestRecommender

Class Method Summary collapse

Class Method Details

.config ⇒ Object 



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# File 'lib/collaborative_filter/config.rb', line 3

def self.config
  @@config ||= Config.new
end

.filter(options = {}) {|config| ... } ⇒ Object

Yields:



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# File 'lib/collaborative_filter.rb', line 13

def self.filter(options={})
  @@logger = options[:logger]

  log "Starting configuration: #{Time.now}"
  raise '#setup must be sent a block' unless block_given?

  yield config

  log "Starting correlations: #{Time.now}"
  config.datasets.each do |name,ds|
    log "  Correlating '#{name}': #{Time.now}"
    ds.run
  end
  log "Starting recommender: #{Time.now}"
  recommendations = config.recommender.new.run(config.datasets, config.recommender_options)

  log "Starting booster: #{Time.now}"
  recommendations = config.content_booster.run(recommendations, config.datasets)

  log "Output: #{Time.now}"
  Output.store config.output, recommendations

  log "Done: #{Time.now}"
end

.log(msg) ⇒ Object 



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# File 'lib/collaborative_filter.rb', line 38

def self.log(msg)
  @@logger.info(msg) if @@logger
end