Echo at the LSHTC Pascal Challenge 2

Christophe Brouard 1, *
* Auteur correspondant
Abstract : A classification system called ECHO has been designed for our participation to the first LSHTC Pascal challenge. This system is based on a principle of echo. It computes the score of a document for a class by combining a bottom-up and top-down propagation of activation in a very simple neural network. For this second edition of the challenge, the system has been refined in order to improve its performances. The main improvement concerns the definition of a method of calibration integrating the distribution of the echo scores of the training documents for each class. Another improvement concerns the management of the relative importance of bottom-up and top-down propagation which we make vary with the class.
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Communication dans un congrès
Joint ECML/PKDD PASCAL Workshop on Large-Scale Hierarchical Classification (LSHC2), Sep 2011, Athens, Greece. George Paliouras, Eric Gaussier, Aris Kosmopoulos, Ion Androutsopoulos, Thierry Artières, Patrick Gallinari, pp.49-57, 2011
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Christophe Brouard. Echo at the LSHTC Pascal Challenge 2. Joint ECML/PKDD PASCAL Workshop on Large-Scale Hierarchical Classification (LSHC2), Sep 2011, Athens, Greece. George Paliouras, Eric Gaussier, Aris Kosmopoulos, Ion Androutsopoulos, Thierry Artières, Patrick Gallinari, pp.49-57, 2011. <hal-00742646>

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