document: Liveclassifier : creating hierarchical text classifiers through web corpora Many Web information services utilize techniques of information extraction ( IE ) to collect important facts from the Web . To create more advanced services , one possible method is to discover thematic information from the collected facts through text classification . However , most conventional text classification techniques rely on manual-labelled corpora and are thus ill-suited to cooperate with Web information services with open domains . In this work , we present a system named LiveClassifier that can automatically train classifiersthrough Web corpora based on user-defined topic hierarchies . Due to its flexibility and convenience , LiveClassifier can be easily adapted for various purposes . New Web information services can be created to fully exploit it ; human users can use it to create classifiers for their personal applications . The effectiveness of classifiers created by LiveClassifier is well supportedby empirical evidence .
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