Class: LSTM_NETWORK

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

Overview

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Instance Method Summary collapse

Instance Method Details

#applyWeightChange ⇒ Object 



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# File 'lib/NETWORK.rb', line 158

def applyWeightChange()
	for i in 0...@lstm_nodes.column_count()
		@lstm_nodes[0,i].applyWeightChange()
	end
end

#backwardPropagate ⇒ Object 



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# File 'lib/NETWORK.rb', line 140

def backwardPropagate()
	i = 0
	delta_h_init = DFloat.zeros(@lstm_nodes[0, i].getHt().shape())
       delta_h_init = 2 * (@lstm_nodes[0, i].getYt() - @lstm_nodes[0, i].getHt())
	delta_c_init = DFloat.zeros(1, @sz)
	@lstm_nodes[0,i].backwardPropagation(delta_h_init, delta_c_init)

	i += 1
	while i <= @lstm_nodes.column_count()-1 do
		#puts "BP cell: " + i.to_s
		delta_h = DFloat.zeros(@lstm_nodes[0, i].getHt().shape())
       	delta_h = 2 * (@lstm_nodes[0, i].getYt() - @lstm_nodes[0, i].getHt())
		delta_h += @lstm_nodes[0, i-1].getBottomDeltaHt()
		delta_c = @lstm_nodes[0, i-1].getBottomDeltaCt()
		@lstm_nodes[0,i].backwardPropagation(delta_h, delta_c)
		i += 1
	end
end

#forwardPropagate(initialH = DFloat.zeros(1, @sz), initialC = DFloat.zeros(1, @sz)) ⇒ Object 



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# File 'lib/NETWORK.rb', line 108

def forwardPropagate(initialH=DFloat.zeros(1, @sz), initialC=DFloat.zeros(1, @sz))
	@Output = DFloat.zeros(@Nodes, @sz)
	# Start from front of network and work forwards
	if initialH != nil && initialC != nil
		@lstm_nodes[0,0].setHprev(initialH)
		@lstm_nodes[0,0].setCprev(initialC)
	else 
		@lstm_nodes[0,0].setHprev(DFloat.zeros(1, @sz))
		@lstm_nodes[0,0].setCprev(DFloat.zeros(1, @sz))
	end
	
	node_input 	= DFloat[*[@Input[0, true].to_a]]
	node_target = DFloat[*[@Target[0, true].to_a]]

	@lstm_nodes[0,0].setXt(node_input)
	@lstm_nodes[0,0].setYt(node_target)
	@lstm_nodes[0,0].forwardPropagation()

	@Output[0, true] = @lstm_nodes[0,0].getHt()
	# Nodes 1 to end
	for i in 1...@lstm_nodes.column_count()
		# Indexing is working now
		node_input 	= DFloat[*[@Input[i, true].to_a]]
		node_target = DFloat[*[@Target[i, true].to_a]]
		@lstm_nodes[0,i].setHprev(@lstm_nodes[0,i-1].getHt())
		@lstm_nodes[0,i].setCprev(@lstm_nodes[0,i-1].getCt())
		@lstm_nodes[0,i].setXt(node_input)
		@lstm_nodes[0,i].setYt(node_target)
		@lstm_nodes[0,i].forwardPropagation()
		@Output[i, true] = @lstm_nodes[0,i].getHt()
	end
end

#getInput(mode = "word_mode") ⇒ Object 



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# File 'lib/NETWORK.rb', line 90

def getInput(mode="word_mode")
	if mode == "word_mode"
		return @dict.decodeArray(@Input)
	elsif mode == "char_mode"
		return @encoder.hotDecodeSentance(@encoder.nArrayToMatrix(@Input))
	elsif mode == "array_mode"
		return @Input
	end
end

#getLSTMNodes ⇒ Object 



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# File 'lib/NETWORK.rb', line 53

def getLSTMNodes()
	return @lstm_nodes
end

#getOutput(mode = "word_mode") ⇒ Object 



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# File 'lib/NETWORK.rb', line 99

def getOutput(mode="word_mode")
	if mode == "word_mode"
		return @dict.decodeArrayByMaximum(@Output)
	elsif mode == "char_mode"
		return @encoder.hotDecodeSentance(@encoder.nArrayToMatrix(@Output))
	elsif mode == "array_mode"
		return @Output
	end
end

#getTarget(mode = "word_mode") ⇒ Object 



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# File 'lib/NETWORK.rb', line 81

def getTarget(mode="word_mode")
	if mode == "word_mode"
		return @dict.decodeArray(@Target)
	elsif mode == "char_mode"
		return @encoder.hotDecodeSentance(@encoder.nArrayToMatrix(@Target))
	elsif mode == "array_mode"
		return @Target
	end
end

#init(nodes, x_dim, alpha, terminal_output = nil) ⇒ Object 



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# File 'lib/NETWORK.rb', line 36

def init(nodes, x_dim, alpha, terminal_output=nil)
	@dict = DICTIONARY. new
	@encoder = ENCODER. new
	@encoder.init()
	@sz = x_dim
	@@Alpha = alpha
	@Nodes = nodes
	### Creating LSTM network (matrix of nodes)
	@lstm_nodes = Matrix.build(1, @Nodes) { LSTM_CELL }
	for i in 0...@lstm_nodes.column_count()
		@lstm_nodes[0,i] = LSTM_CELL. new
		@lstm_nodes[0,i].init(@@Alpha, @sz, terminal_output)
	end
	## Input and target
	@Input = DFloat.zeros(nodes, @sz)
	@Target = DFloat.zeros(nodes, @sz)
end

#setDictionary(dictionary) ⇒ Object 



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# File 'lib/NETWORK.rb', line 56

def setDictionary(dictionary)
	@dict = dictionary
end

#setInput(input, mode = nil) ⇒ Object 



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# File 'lib/NETWORK.rb', line 70

def setInput(input, mode=nil)
	if mode == "encoded"
		@Input = input
	elsif input.instance_of? String
		@Input = @encoder.matrixToNArray(@encoder.hotEncodeSentance(input))
	elsif input.instance_of? Array
		@Input = @dict.encodeArray(input)
	else
		raise "Target input is not of type Array or String"
	end
end

#setTarget(target, mode = nil) ⇒ Object 



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# File 'lib/NETWORK.rb', line 59

def setTarget(target, mode=nil)
	if mode == "encoded"
		@Target = target
	elsif target.instance_of? String
		@Target = @encoder.matrixToNArray(@encoder.hotEncodeSentance(target))
	elsif target.instance_of? Array
		@Target = @dict.encodeArray(target)
	else
		raise "Target input is not of type Array or String"
	end
end