Paper presentation @ IEEE Big Data 2017

Thomas Papastergiou presented at IEEE International Conference on Big Data (IEEE Big Data 2017) the paper “A distributed proximal gradient descent method for tensor completion”. The conference took place in Boston, MA, USA on December 11-14th 2017, and the paper was presented at the 3rd Special Session on Intelligent Data Mining.

Paper Abstract:

In this paper, we propose a novel proximal method for CANDECOMP/PARAFAC (CP) decomposition to deal with the tensor completion problem. This approach is based on solving local optimization problems, rather than confronting the entire optimization problem at once. In addition, we propose two distributed algorithms for dealing with data of high dimensionality that scale up to tensors of dimension 10 8 ×10 8 ×10 8 . We show that our proximal method outperforms the Stochastic Gradient Descent (SGD) for CP decomposition in terms of convergence accuracy by a factor of 2.8 and it can efficiently and effectively reconstruct a color image by observing only 10% of its entries. Experimental results show that our distributed methods are scalable in terms of dimensionality, factorization rank, number of machines and perform efficiently in both dense and sparse settings. The proposed distributed proximal approach outperforms existing distributed methods in terms of speed of convergence by a factor of two. Moreover, it can successfully recover a hyperspectral image, by observing 10% of its values.

Full paper: