ReVival is an online tool to recover missing blocks in time series using the Centroid Decomposition (CD) technique and to visualize the properties of the algorithm.

This tool was created at the eXascale Infolab, a research group at the University of Fribourg, Switzerland.


Centroid Decomposition

The Centroid Decomposition (CD) is a matrix decomposition technique that decomposes an input matrix X (consisting of multiple time-series as columns) into the product of two matrices L (loading matrix) and R (relevance matrix), such that X = L * RT. CD allows to efficiently perform recovery of missing values in large time series, both in batch mode and streaming mode.

In addition to the recovery, ReVival can be used as an online calculator to compute the Centroid Cecomposition and to visualize different sign vector maximization strategies that can be used by CD.


Features



Publications

  • Ines Arous, Mourad Khayati, Philippe Cudré-Mauroux, Ying Zhang, Martin Kersten, and Svetlin Stalinlov. “RecovDB: Accurate and Efficient Missing Blocks Recovery for Large Time Series.” In 35th IEEE International Conference on Data Engineering (ICDE 2019). Macau, China, 2019.
  • Mourad Khayati, Michael H. Böhlen, and Johann Gamper. “Memory-Efficient Centroid Decomposition for Long Time Series.” In IEEE 30th International Conference on Data Engineering (ICDE 2014), Chicago, ICDE 2014, IL, USA, March 31 - April 4, 2014, 100–111, 2014.

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Research Projects:


March 2019