Class: Wikipedia::VandalismDetection::Features::SizeRatio

Inherits:
Base
  • Object
show all
Defined in:
lib/wikipedia/vandalism_detection/features/size_ratio.rb

Overview

This feature computes the ratio of the edit’s revisions text length.

Instance Method Summary collapse

Methods inherited from Base

#count

Instance Method Details

#calculate(edit) ⇒ Object

Returns the ration of new text length to old text length: returns 0.0 for empty old revision text, returns 1.0 for empty new revision text, returns 0.5 for both revision texts empty or same size computation: old / old + new



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# File 'lib/wikipedia/vandalism_detection/features/size_ratio.rb', line 15

def calculate(edit)
  super

  old_size = edit.old_revision.text.size.to_f
  new_size = edit.new_revision.text.size.to_f

  (old_size == 0 && new_size == 0) ? 0.5 : old_size / (old_size + new_size)
end