Class: Wallace::BreedingGraph::InputNode

Inherits:
Node
  • Object
show all
Defined in:
lib/core/breeding_graph/input_node.rb

Overview

Used to represent input nodes (i.e. sub-population selection nodes) in the breeding graph.

Instance Attribute Summary

Attributes inherited from Node

#function, #inputs

Instance Method Summary collapse

Constructor Details

#initialize(selector) ⇒ InputNode

Constructs a new input node.

Parameters:

  • selector, the selection method used by this input node.



9
10
11
12
 
# File 'lib/core/breeding_graph/input_node.rb', line 9

def initialize(selector)
  super(selector, [])
  @candidates = []
end

Instance Method Details

#clean! ⇒ Object

Clears the contents of the buffer and candidates list for this input node.



50
51
52
53
 
# File 'lib/core/breeding_graph/input_node.rb', line 50

def clean!
  super
  @candidates.clear
end

#clone ⇒ Object

Creates a clone of this node and its inputs.



45
46
47
 
# File 'lib/core/breeding_graph/input_node.rb', line 45

def clone
  Wallace::BreedingGraph::InputNode.new(@function)
end

#prepare!(candidates, opts = {}) ⇒ Object

Prepares this input node for the next breeding cycle by supplying the contents of the sub-population and performing any necessary post-processing.

To prevent redundant post-processing when using multiple threads, we can supply a prepared candidate list from the same input node from an other breeding graph.

Parameters:

  • candidates, a list of (possibly post-processed) candidates for selection.

  • opts, a hash of keyword options for this method. -> random, the RNG to use when preparing the candidate list. -> processed, a flag indicating if this candidate list has already been post-processed.

Returns: The prepared candidate list (so that it can be exploited by identical nodes in other graphs).



39
40
41
42
 
# File 'lib/core/breeding_graph/input_node.rb', line 39

def prepare!(candidates, opts = {})
  @candidates = opts[:processed] ? candidates.clone : @function.prepare(candidates, opts)
  return @candidates
end

#take!(rng) ⇒ Object

Selects a single individual from the list of candidates using the selection method associated with this node.

Parameters:

  • rng, the RNG to use when selecting an individual from the list of candidates.



21
22
23
 
# File 'lib/core/breeding_graph/input_node.rb', line 21

def take!(rng)
  @function.produce(rng, @candidates).clone
end