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jekyll / classifier-reborn

A general classifier module to allow Bayesian and other types of classifications. A fork of cardmagic/classifier.
https://jekyll.github.io/classifier-reborn/
GNU Lesser General Public License v2.1
554 stars 110 forks source link

fix sqrt issue when there is only one char various in traindata #154

Closed hakehuang closed 7 years ago

hakehuang commented 7 years ago

this is a fix for below issue 

lsi = ClassifierReborn::LSI.new
lsi.add_item 'log message Error: 1', :Error
lsi.add_item 'log message Error: 0', :passenger_ship: 
result  = lsi.classify 'log message Error: 1'

then the sqrt will have error when do the svd operation.

D:/projects/P_hobbit/AI/log_classifier/lib/classifier-reborn/extensions/vector.rb:58:in `sqrt': Numerical argument is out of domain - "sqrt" (Math::DomainError)
    from D:/projects/P_hobbit/AI/log_classifier/lib/classifier-reborn/extensions/vector.rb:58:in `block in SV_decomp'
    from D:/projects/P_hobbit/AI/log_classifier/lib/classifier-reborn/extensions/vector.rb:57:in `times'
    from D:/projects/P_hobbit/AI/log_classifier/lib/classifier-reborn/extensions/vector.rb:57:in `SV_decomp'
    from D:/projects/P_hobbit/AI/log_classifier/lib/classifier-reborn/lsi.rb:311:in `build_reduced_matrix'
    from D:/projects/P_hobbit/AI/log_classifier/lib/classifier-reborn/lsi.rb:143:in `build_index'
    from D:/projects/P_hobbit/AI/log_classifier/lib/classifier-reborn/lsi.rb:77:in `add_item'
    from D:/projects/P_hobbit/AI/log_classifier/pass_fail.rb:34:in `<main>'

Signed-off-by: Hake Huang hakehuang@gmail.com