Class Ai4r::Som::TwoPhaseLayer
In: lib/ai4r/som/two_phase_layer.rb
Parent: Layer

responsible for the implementation of the algorithm‘s decays, extends the class Layer. currently overrides the radius and learning rate decay methods of Layer. Has two phases, phase one has a decay in both the learning rate and the radius. The number of epochs for both phases can be passed and the total number of epochs is the sum of epoch for phase one and phase two. In the scond phase, the learning and radius decay is steady, normally set to a small number (ie. 0.01)

Parameters

  • nodes => number of nodes in the SOM (nodes x nodes). Has to be the same number

you pass to the SOM. Has to be an integer

  • radius => the initial radius for the neighborhood
  • phase_one => number of epochs for phase one, has to be an integer. By default it is set to 150
  • phase_two => number of epochs for phase two, has to be an integer. By default it is set to 100
  • learning_rate => sets the initial learning rate
  • phase_one_learning_rate => sets the learning rate for phase one
  • phase_two_learning_rate => sets the learning rate for phase two

Methods

Public Class methods

Public Instance methods

two different values will be returned, depending on the phase in phase one, the rate will incrementially reduced everytime this method is called on the switch of phases, the learning rate will be reset and the delta_lr (which signals the decay value of the learning rate) is reset as well in phase two, the newly reset delta_lr rate will be used to incrementially reduce the learning rate

two different values will be returned, depending on the phase in phase one, the radius will incrementially reduced by 1 every @radius_reduction time in phase two, the radius is fixed to 1

[Validate]