PASCAL - Pattern Analysis, Statistical Modelling and Computational Learning

Overview of Morpho Challenge in CLEF 2007
Mikko Kurimo, Mathias Creutz and Ville Turunen
In: Morpho Challenge Workshop at CLEF 2007, 19-21 Sep 2007, Budapest, Hungary.


Morpho Challenge 2007 contained an evaluation of unsupervised morpheme analysis algorithms using information retrieval experiments utilizing data available in CLEF. The objective of the challenge was to design statistical machine learning algorithms that discover which morphemes (smallest individually meaningful units of language) words consist of. Ideally, these are basic vocabulary units suitable for different tasks, such as text understanding, machine translation, information retrieval, and statistical language modeling The evaluation of the submitted morpheme analysis was performed by two complementary ways: Competition 1: The proposed morpheme analyses were compared to a linguistic morpheme analysis gold standard by matching the morphemesharing word pairs. Competition 2: Information retrieval (IR) experiments were performed, where the words in the documents and queries were replaced by their proposed morpheme representations and the search was based on morphemes instead of words. This paper provides an overview of the IR evaluation. The IR evaluations were provided for Finnish, German, and English and participants were encouraged to apply their algorithm to all of them. The organizers performed the IR experiments using the queries, texts, and relevance judgments available in CLEF forum and morpheme analysis methods submitted by the challenge participants. The results show that the morpheme analysis has a significant effect in IR performance in all languages, and that the performance of the best unsupervised methods can be superior to the supervised reference methods. The challenge was part of the EU Network of Excellence PASCAL Challenge Program and organized in collaboration with CLEF.

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EPrint Type:Conference or Workshop Item (Invited Talk)
Project Keyword:Project Keyword UNSPECIFIED
Subjects:Learning/Statistics & Optimisation
Natural Language Processing
Theory & Algorithms
Information Retrieval & Textual Information Access
ID Code:3712
Deposited By:Mikko Kurimo
Deposited On:14 February 2008