Class: LSTM_CELL

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

Overview

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Instance Method Summary collapse

Instance Method Details

#applyWeightChange ⇒ Object 



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# File 'lib/CELL.rb', line 144

def applyWeightChange()
  #puts ">> " + @dWg[0,0].to_s
  ### Apply input weight changes
  @Wi += @@Alpha * @dWi #@@Alpha
  @Wf += @@Alpha * @dWf
  @Wo += @@Alpha * @dWo
  @Wg += @@Alpha * @dWg
  ### Apply Cell output weight changes
  @Ui += @@Alpha * @dUi
  @Uf += @@Alpha * @dUf
  @Uo += @@Alpha * @dUo
  @Ug += @@Alpha * @dUg
  ### Apply bias changes
  @Bi += @@Alpha * @dBi
  @Bf += @@Alpha * @dBf
  @Bo += @@Alpha * @dBo
  @Bg += @@Alpha * @dBg
  #puts "<< " + @Wg[0,0].to_s
  ### Change related to cell input
  @dWi = DFloat.zeros(1, @sz)
  @dWf = DFloat.zeros(1, @sz)
  @dWo = DFloat.zeros(1, @sz)
  @dWg = DFloat.zeros(1, @sz)
  ### Change related to cell state
  @dUi = DFloat.zeros(1, @sz)
  @dUf = DFloat.zeros(1, @sz)
  @dUo = DFloat.zeros(1, @sz)
  @dUg = DFloat.zeros(1, @sz)
  ### Change required to Bias 
  @dBi = DFloat.zeros(1, @sz)
  @dBf = DFloat.zeros(1, @sz)
  @dBo = DFloat.zeros(1, @sz)
  @dBg = DFloat.zeros(1, @sz)
end

#backwardPropagation(top_diff_h, top_diff_c) ⇒ Object

Back propagation



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# File 'lib/CELL.rb', line 107

def backwardPropagation(top_diff_h, top_diff_c)
  dC = hp(@O, top_diff_h) + top_diff_c
  dO = hp(@Ct, top_diff_h)
  dI = hp(@G, dC)
  dG = hp(@I, dC)
  dF = hp(@Cprev, dC)
  
  dIinput = hp(sigmoidDer(@I), dI)
  dFinput = hp(sigmoidDer(@F), dF)
  dOinput = hp(sigmoidDer(@O), dO)
  dGinput = hp(tanhDer(@G), dG)
  ### Calculating change required to input weight matrices
  @dWi -= hp(dIinput, @Xt)
  @dWf -= hp(dFinput, @Xt)
  @dWo -= hp(dOinput, @Xt)
  @dWg -= hp(dGinput, @Xt)
  #p @dWi.to_a
  ### Calculating change required to cell state weight matrices
  @dUi += hp(dIinput, @Hprev)
  @dUf += hp(dFinput, @Hprev)
  @dUo += hp(dOinput, @Hprev)
  @dUg += hp(dGinput, @Hprev)
  ### Calculating change required to bias vectors
  @dBi += dIinput
  @dBf += dFinput
  @dBo += dOinput
  @dBg += dGinput
  ### Calculating change required to HPrev
  dHprev = DFloat.zeros(1, @sz)
  dHprev += @Wi.transpose.dot(dIinput)
  dHprev += @Wf.transpose.dot(dFinput)
  dHprev += @Wo.transpose.dot(dOinput)
  dHprev += @Wg.transpose.dot(dGinput)
  ### Calculating and returning bottoms
  @bottom_diff_c = hp(dC, @F)
  @bottom_diff_h = dHprev 
end

#forwardPropagation ⇒ Object

Forward Propagation



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# File 'lib/CELL.rb', line 92

def forwardPropagation()
  ### Calculating gate values
  @Zf = @Wf.dot(@Xt) + @Uf.dot(@Hprev) + @Bf
  @F = sigmoidVector(@Zf)
  @Zi = @Wi.dot(@Xt) + @Ui.dot(@Hprev) + @Bi
  @I = sigmoidVector(@Zi)
  @Zo = @Wo.dot(@Xt) + @Uo.dot(@Hprev) + @Bo
  @O = sigmoidVector(@Zo)
  @Zg = @Wg.dot(@Xt) + @Ug.dot(@Hprev) + @Bg
  @G = NMath.tanh(@Zg)  
  ### Calculating cell states 
  @Ct = hp(@F, @Cprev) + hp(@I, @G)
  @Ht = hp(@O,  NMath.tanh(@Ct))
end

#getBottomDeltaCt ⇒ Object 



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# File 'lib/CELL.rb', line 249

def getBottomDeltaCt()
  return @bottom_diff_c
end

#getBottomDeltaHt ⇒ Object 



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# File 'lib/CELL.rb', line 246

def getBottomDeltaHt()
  return @bottom_diff_h
end

#getCt ⇒ Object 



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# File 'lib/CELL.rb', line 258

def getCt
  return @Ct
end

#getHt ⇒ Object 



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# File 'lib/CELL.rb', line 255

def getHt()
  return @Ht
end

#getYt ⇒ Object 



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# File 'lib/CELL.rb', line 252

def getYt()
  return @Yt
end

#hp(nArr1, nArr2) ⇒ Object

Hadamard product



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

def hp(nArr1, nArr2)
  nArr3 = DFloat.zeros(nArr1.shape())
  dims = nArr1.shape()
  for i in 0...(dims[0])
    for j in 0...(dims[1])
      nArr3[i,j] = (nArr1[i,j] * nArr2[i,j])
    end
  end
  return nArr3
end

#init(alpha, sz, terminal_output = nil) ⇒ Object

constructing the required arrays (Numo::NArrays)



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# File 'lib/CELL.rb', line 32

def init(alpha, sz, terminal_output=nil)
  @sz = sz
  @@Alpha = alpha
  ### Weight matrices with regard to inputs
  @Wg = DFloat.new(1, @sz).rand
  @Wi = DFloat.new(1, @sz).rand
  @Wf = DFloat.new(1, @sz).rand
  @Wo = DFloat.new(1, @sz).rand
  ### Weight matrices with regard to cell previous cell output
  @Ug = DFloat.new(1, @sz).rand
  @Ui = DFloat.new(1, @sz).rand
  @Uf = DFloat.new(1, @sz).rand
  @Uo = DFloat.new(1, @sz).rand
  ### Bias
  @Bg = DFloat.new(1, @sz).rand
  @Bi = DFloat.new(1, @sz).rand
  @Bf = DFloat.new(1, @sz).rand
  @Bo = DFloat.new(1, @sz).rand
  ### Cell input
  @Xt = DFloat.zeros(1, @sz)
  @Yt = DFloat.zeros(1, @sz)
  ### Cell state
  @Hprev   = DFloat.zeros(1, @sz) # Previous cell output
  @Cprev  = DFloat.zeros(1, @sz) # Previous cell state
  @Ct  = DFloat.zeros(1, @sz) # Cell state
  @Ht  = DFloat.zeros(1, @sz) # Cell output    
  ### Internal Cell gates
  @F = DFloat.new(1, @sz).rand
  @I = DFloat.new(1, @sz).rand
  @O = DFloat.new(1, @sz).rand
  @G = DFloat.new(1, @sz).rand
  ### BPTT variables 
  ### Change related to cell input
  @dWi = DFloat.zeros(1, @sz)
  @dWf = DFloat.zeros(1, @sz)
  @dWo = DFloat.zeros(1, @sz)
  @dWg = DFloat.zeros(1, @sz)
  ### Change related to cell state
  @dUi = DFloat.zeros(1, @sz)
  @dUf = DFloat.zeros(1, @sz)
  @dUo = DFloat.zeros(1, @sz)
  @dUg = DFloat.zeros(1, @sz)
  ### Change required to Bias 
  @dBi = DFloat.zeros(1, @sz)
  @dBf = DFloat.zeros(1, @sz)
  @dBo = DFloat.zeros(1, @sz)
  @dBg = DFloat.zeros(1, @sz)
end

#setCprev(cp) ⇒ Object 



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# File 'lib/CELL.rb', line 238

def setCprev(cp)
  @Cprev = cp
  if cp.shape()[0] != 1
    puts "Size of cp: " + cp.shape().to_s
    raise "Setting @Cprev of LSTM cell raised an incorrect dimension error"
    return
  end
end

#setHprev(hp) ⇒ Object 



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# File 'lib/CELL.rb', line 230

def setHprev(hp)
  if hp.shape()[0] != 1
    puts "Size of hp: " + hp.shape().to_s
    raise "Setting @Hprev of LSTM cell raised an incorrect dimension error"
    return
  end
  @Hprev = hp
end

#setXt(xt) ⇒ Object

Getters and Setters



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# File 'lib/CELL.rb', line 214

def setXt(xt)
  if xt.shape()[0] != 1
    puts "Size of xt: " + xt.shape().to_s
    raise "Setting @Xt of LSTM cell raised an incorrect dimension error"
    return
  end
  @Xt = xt
end

#setYt(yt) ⇒ Object 



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# File 'lib/CELL.rb', line 222

def setYt(yt)
  if yt.shape()[0] != 1
    puts "Size of yt: " + yt.shape().to_s
    raise "Setting @Yt of LSTM cell raised an incorrect dimension error"
    return
  end
  @Yt = yt
end

#sigmoid(value_) ⇒ Object 



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# File 'lib/CELL.rb', line 209

def sigmoid(value_)
  output_value =  1 / (1 + Math.exp(-1 * value_))
  return output_value
end

#sigmoidDer(v) ⇒ Object 



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# File 'lib/CELL.rb', line 189

def sigmoidDer(v)
  #input vector must be a horisontal vector
  output_vector = DFloat.zeros(v.shape[0], v.shape[1])
  for i in 0...v.shape[0]
    for j in 0...v.shape[1]
      output_vector[i,j] = v[i,j] * (1 - v[i,j])
    end
  end
  return output_vector
end

#sigmoidVector(v) ⇒ Object 



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# File 'lib/CELL.rb', line 199

def sigmoidVector(v)
  #input vector must be a horisontal vector
  output_vector = DFloat.zeros(v.shape[0], v.shape[1])
  for i in 0...v.shape[0]
    for j in 0...v.shape[1]
      output_vector[i,j] = sigmoid(v[i,j])
    end
  end
  return output_vector
end

#tanhDer(v) ⇒ Object

Transfer functions



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# File 'lib/CELL.rb', line 179

def tanhDer(v)
  #input vector must be a horisontal vector
  output_vector = DFloat.zeros(v.shape[0], v.shape[1])
  for i in 0...v.shape[0]
    for j in 0...v.shape[1]
      output_vector[i,j] = 1 - (v[i,j]**2)
    end
  end
  return output_vector
end