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NECO
2010
129views more  NECO 2010»
15 years 4 months ago
A Two-Layer Model of Natural Stimuli Estimated with Score Matching
We consider a hierarchical two-layer model of natural signals in which both layers are learned from the data. Estimation is accomplished by Score Matching, a recently proposed est...
Urs Köster, Aapo Hyvärinen
RSA
2010
104views more  RSA 2010»
15 years 4 months ago
An approximation algorithm for counting contingency tables
Abstract. We present a randomized approximation algorithm for counting contingency tables, m × n non-negative integer matrices with given row sums R = (r1, . . . , rm) and column ...
Alexander I. Barvinok, Zur Luria, Alex Samorodnits...
RTS
2010
79views more  RTS 2010»
15 years 4 months ago
Spin-based reader-writer synchronization for multiprocessor real-time systems
Reader preference, writer preference, and task-fair reader-writer locks are shown to cause undue blocking in multiprocessor real-time systems. Phase-fair reader writer locks, a ne...
Björn B. Brandenburg, James H. Anderson
EMNLP
2009
15 years 3 months ago
Better Synchronous Binarization for Machine Translation
Binarization of Synchronous Context Free Grammars (SCFG) is essential for achieving polynomial time complexity of decoding for SCFG parsing based machine translation systems. In t...
Tong Xiao, Mu Li, Dongdong Zhang, Jingbo Zhu, Ming...
COMPGEOM
2007
ACM
15 years 7 months ago
Between umbra and penumbra
Computing shadow boundaries is a difficult problem in the case of non-point light sources. A point is in the umbra if it does not see any part of any light source; it is in full l...
Julien Demouth, Olivier Devillers, Hazel Everett, ...