Google Inc.

Dmity Korolev

Matthias Heiler

Thomas Hofmann

Hartmut Maennel

Michael Schaer

Wojciech Gajewski

Justyna Sidorska

Methods, systems, and apparatus, including computer program products, for constructing text classifiers. The method includes receiving a collection of candidate phrases for a given topic; filtering the received candidate phrases to remove erroneously included candidate phrases; assigning weights to the candidate phrases including scoring each candidate phrase using an initial classifier and assigning weights to the candidate phrases based on the scores; and generating a linear classifier using the filtered and weighted candidate phrases, where the linear classifier varies the weights for each phrase candidate depending on the length of the document being classified.

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Unteriberg, Switzerland

Dmity Korolev