#outlier-detection

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In scikit-learn's terminology, what distinguishes novelty detection from outlier detection?

Novelty detection assumes clean training data and judges only new observations1
Novelty detection needs labelled examples of anomalies, while outlier detection does not2
Outlier detection can only flag new observations, never points of the training set3
The two terms are synonyms for the same task in scikit-learn4

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