Class: Node

Inherits:
Object
  • Object
show all
Defined in:
lib/som/node.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(id, number_of_weights) ⇒ Node

Returns a new instance of Node.



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# File 'lib/som/node.rb', line 5

def initialize(id, number_of_weights)
  create_weights(number_of_weights)
  @id = id
  @bucket = []
end

Instance Attribute Details

#bucket ⇒ Object (readonly)

Returns the value of attribute bucket.



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# File 'lib/som/node.rb', line 3

def bucket
  @bucket
end

#id ⇒ Object (readonly)

Returns the value of attribute id.



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# File 'lib/som/node.rb', line 3

def id
  @id
end

Instance Method Details

#<<(data) ⇒ Object

A bucket is a place to put the data that is closest to it



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# File 'lib/som/node.rb', line 22

def <<(data)
  @bucket << data
end

#distance_from(data_points) ⇒ Object

Euclidean Distance



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# File 'lib/som/node.rb', line 27

def distance_from(data_points)
  distance = 0
  data_points.each_with_index do |point, index|
    distance += (point - weights[index]) ** 2
  end
  Math.sqrt(distance)
end

#update_weight(learning_rate, inputs, neighborhood_function = 1) ⇒ Object 



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# File 'lib/som/node.rb', line 15

def update_weight(learning_rate, inputs, neighborhood_function=1)
  weights.each_with_index do |weight, index|
    @weights[index] += learning_rate * neighborhood_function * (inputs[index] - weight)
  end
end

#weights ⇒ Object 



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# File 'lib/som/node.rb', line 11

def weights
  @weights ||= []
end