Class: Wikipedia::VandalismDetection::Features::ImpactBase

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

Instance Method Summary collapse

Methods inherited from Base

#calculate, #count

Instance Method Details

#impact(old_text, new_text, terms) ⇒ Object

Returns the ratio of given text’s terms count. For impact calculation it returns 0.5 if number of terms in old text is zero.



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# File 'lib/wikipedia/vandalism_detection/features/impact_base.rb', line 11

def impact(old_text, new_text, terms)
  old_terms_count = (count terms, in: old_text).to_f
  new_terms_count = (count terms, in: new_text).to_f

  no_terms_in_both = (old_terms_count == 0 && new_terms_count == 0)
  no_terms_in_both ? 0.5 : (old_terms_count / (old_terms_count + new_terms_count))
end