研究目的
Investigating the effectiveness of temporal dynamic matrix factorization techniques for predicting missing values in large-scale coevolving time series.
研究成果
The proposed temporal dynamic matrix factorization methods effectively predict missing values in large-scale coevolving time series, showing superior performance and efficiency compared to traditional methods, even at high missing ratios. The study also demonstrates the feasibility of implementing these methods on Apache Spark for big data applications.
研究不足
The proposed methods aim at handling homogeneous data sets, indicating a limitation in dealing with heterogeneous data sets.
1:Experimental Design and Method Selection:
The study employs temporal dynamic matrix factorization techniques, incorporating hybrid regularization terms to constrain the objective functions of matrix factorization.
2:Sample Selection and Data Sources:
The experiments are conducted on four data sets, including two medium scale (Motes and Sea-Surface Temperature) and two large scale (Gas Sensor Array under dynamic gas mixtures and Synthetic) data sets.
3:List of Experimental Equipment and Materials:
The study utilizes Apache Spark for parallel computing experiments in a cluster of four working machines.
4:Experimental Procedures and Operational Workflow:
The methodology involves building initial models, updating models with new samples, and evaluating performance using root mean squared error (RMSE).
5:Data Analysis Methods:
The performance of the proposed methods is compared with baseline methods using RMSE as the evaluation metric.
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