Class: Kmeans::Cluster

Inherits:
Object
  • Object
show all
Defined in:
lib/kmeans/cluster.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(word_counts, user_options = {}) ⇒ Cluster

Returns a new instance of Cluster.



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# File 'lib/kmeans/cluster.rb', line 5

def initialize(word_counts, user_options = {})
  @word_counts = word_counts
  @min_and_max = {}
  @centroids = {}
  @cluster = Hash.new {|hash, key| hash[key] = []}
  @options = {
    :centroids => 4,
    :loop_max => 100
  }.merge(user_options)
end

Instance Attribute Details

#cluster ⇒ Object (readonly)

Returns the value of attribute cluster.



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# File 'lib/kmeans/cluster.rb', line 16

def cluster
  @cluster
end

Instance Method Details

#make_cluster ⇒ Object 



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# File 'lib/kmeans/cluster.rb', line 18

def make_cluster
  @min_and_max = min_and_max_in_word_counts
  @centroids = random_centroids

  loop_counter = 0
  old_centroids = nil
  until (@centroids == old_centroids) or (@options[:loop_max] < loop_counter)
    loop_counter += 1
    attach_keys_to_nearest_centroid
    old_centroids = Marshal.load(Marshal.dump(@centroids))
    @centroids.each_key {|centroid|
      @centroids[centroid] = average_attached(centroid) if @cluster[centroid].any?
    }
  end
end