Efficient Sequence Regression by Learning Linear Models in All-Subsequence Space

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Title: Efficient Sequence Regression by Learning Linear Models in All-Subsequence Space
Authors: Gsponer, Severin
Smyth, Barry
Ifrim, Georgiana
Permanent link: http://hdl.handle.net/10197/9054
Date: 22-Sep-2017
Abstract: We present a new approach for learning a sequence regressionfunction, i.e., a mapping from sequential observations to a numericscore. Our learning algorithm employs coordinate gradient descent andGauss-Southwell optimization in the feature space of all subsequences.We give a tight upper bound for the coordinate wise gradients of squarederror loss that enables ecient Gauss-Southwell selection. The proposedbound is built by separating the positive and the negative gradients ofthe loss function and exploits the structure of the feature space. Extensiveexperiments on simulated as well as real-world sequence regressionbenchmarks show that the bound is eective and our proposed learningalgorithm is ecient and accurate. The resulting linear regression modelprovides the user with a list of the most predictive features selected duringthe learning stage, adding to the interpretability of the method.
Funding Details: Science Foundation Ireland
Type of material: Conference Publication
Keywords: Machine learningStatistics
Language: en
Status of Item: Peer reviewed
Conference Details: The European Conference on Machine Learning & Principles and Practice of Knowledge Discovery in Databases, Skopje, Macedonia 18-22 September 2017
Appears in Collections:Insight Research Collection

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