When the Preprocess URLs parameter is selected, all URLs will be replaced by a special word __url__ . This will allow a model to learn from the mention of URLs in general rather than learning from specific mentions or instances. 

This is particularly useful for excluding URLs from features (i.e.: using the Preprocess URLs parameter in combination with the model's stopwords) in cases for which the information encoded in URLs is of little value for classification purposes. 

    

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