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Page: Using a Classifier or Ranker
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A '''binary classifier''' is used to say whether or not a page has a property (for example, being a spam page or not). Classifiers can be created using the Manage Classifiers activity. <br/> The classifiers that have been created in this Yioop instance are listed in the table below and can be used for future crawls. Given a classifier named foo, selecting the '''Use to Classify''' check box for it tells Yioop to insert some subset of the following labels as meta-words when it indexes a page: <pre> class:foo class:foo:10plus class:foo:20plus class:foo:30plus class:foo:40plus ... class:foo:50 ... </pre> When a document is scored against a classifier foo, it gets a score between 0 and 1 and if the score is greater than 0.5 the meta-word class:foo is added. A meta-word class:foo:XXplus indicates the document achieved at least a score of XX with respect to the classifier, and a meta-word class:foo:XX indicates it had a score between 0.XX and 0.XX + 0.9. <br /> The '''Use to Rank''' checkbox indicates that Yioop should take the score between 0 and 1 and use this as one of the scores when ranking search results.
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