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kNN: Discussion
No feature selection necessary
Scales well with large number of classes
Don’t need to train n classifiers for n classes
Classes can influence each other
Small changes to one class can have ripple effect
Scores can be hard to convert to probabilities
No training necessary
Actually: perhaps not true. (Data editing, etc.)
May be expensive at test time
In most cases it’s more accurate than NB or Rocchio
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