class Newral::Functions::Line

line is very simple, easiest to start getting familiar with gradient descent

Attributes

center[RW]

Public Class Methods

create_random( low_range: -9, high_range: 9 ) click to toggle source
# File lib/newral/functions/line.rb, line 18
def self.create_random( low_range: -9, high_range: 9 )
  factor= low_range+rand(high_range-low_range)
  bias = low_range+rand(high_range-low_range)
  self.new( factor: factor, bias: bias )
end
new( factor: 1, bias: 0, center: nil ) click to toggle source
# File lib/newral/functions/line.rb, line 8
def initialize( factor: 1, bias: 0, center: nil )
  @factor = factor
  @bias = bias
  @center = center.dup if center
end

Public Instance Methods

calculate( input ) click to toggle source
# File lib/newral/functions/line.rb, line 14
def calculate( input ) 
  @factor*input+@bias
end
move( direction: 0, step:0.01, step_percentage: nil ) click to toggle source
# File lib/newral/functions/line.rb, line 28
def move( direction: 0, step:0.01, step_percentage: nil )
  case direction
    when 0 then @bias=(step_percentage ? @bias*(1+step_percentage.to_f/100) : @bias+step )
    when 1 then @factor=(step_percentage ? @factor*(1+step_percentage.to_f/100)  : @factor+step )
  else 
    raise Errors::InvalidDirection
  end
  self
end
move_with_gradient( input:[], output:[], learning_rate: 0.01 ) click to toggle source
# File lib/newral/functions/line.rb, line 38
def move_with_gradient( input:[], output:[], learning_rate: 0.01 )
   bias_gradient = 0
   factor_gradient = 0
   input.each_with_index do |x,idx|
     bias_gradient = bias_gradient-2.0/input.size*( output[idx]-( @factor*x + @bias ))
     factor_gradient = factor_gradient-2.0/input.size*x*( output[idx]-(@factor*x+@bias) )
     # b_gradient += -(2/N) * (points[i].y - ((m_current*points[i].x) + b_current))
      # m_gradient += -(2/N) * points[i].x * (points[i].y - ((m_current * points[i].x) + b_current))
    end 
  @bias = @bias - (learning_rate * bias_gradient)
  @factor = @factor - (learning_rate * factor_gradient)
end
number_of_directions() click to toggle source
# File lib/newral/functions/line.rb, line 24
 def number_of_directions
  2 
end