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題名 On Selecting Feature-Value Pairs on Smart Phones for Activity Inferences
作者 Njoo, G. S.;Peng, Y.-H.;Peng, W.-C.;Hsu, K.-W.
徐國偉
貢獻者 資科系
日期 2014-10
上傳時間 11-四月-2016 16:04:21 (UTC+8)
摘要 Prior works have been elaborated on activity inferences from context information sensed on smart phones. Most of sensing computations are performed on CPU of smart phones. Thus, Sensor Hub is designed to avoid CPU involvement. However, Sensor Hub has several limitations, such as limited memory space and computation power. Since activity inference is a classification problem, prior works have already proposed some classifiers on smart phones. However, if one would like to build a classifier model in Sensor Hub, one challenging issue is to reduce the model size. One approach to reduce the model size of classifiers is feature selection. Feature selection reduces the model size by removing features in the feature set. Nonetheless, because sensor space is limited, removing features could reduce accuracy of classifier algorithm significantly. Therefore we explore feature-value selection concept, which considers the value rather than the feature to reduce the model size while preserving accuracy of classifiers. In this paper, we propose three feature-value selection methods, which consider confusion and redundancy among the feature-value. Due to the nature of feature-values, discretization of sensor data is important. We design a discretization method, LGD (Length Gini Discretization) and compare it with another method, MDLP (Minimum Description Length Discretization), to discretize sensor data using confusion metric to choose the cut point. Extensive experiments are conducted to evaluate our proposed feature-value selection methods. Feature-value removal allows us to reduce up to 80% of the model size and maintain average accuracy performance to 86%.
關聯 International Conference on Data Science and Advanced Analytics (DSAA), Shanghai, China, October 30-November 1, 2014, 319-325
資料類型 conference
DOI http://dx.doi.org/10.1109/DSAA.2014.7058091
dc.contributor 資科系
dc.creator (作者) Njoo, G. S.;Peng, Y.-H.;Peng, W.-C.;Hsu, K.-W.
dc.creator (作者) 徐國偉zh_TW
dc.date (日期) 2014-10
dc.date.accessioned 11-四月-2016 16:04:21 (UTC+8)-
dc.date.available 11-四月-2016 16:04:21 (UTC+8)-
dc.date.issued (上傳時間) 11-四月-2016 16:04:21 (UTC+8)-
dc.identifier.uri (URI) http://nccur.lib.nccu.edu.tw/handle/140.119/84113-
dc.description.abstract (摘要) Prior works have been elaborated on activity inferences from context information sensed on smart phones. Most of sensing computations are performed on CPU of smart phones. Thus, Sensor Hub is designed to avoid CPU involvement. However, Sensor Hub has several limitations, such as limited memory space and computation power. Since activity inference is a classification problem, prior works have already proposed some classifiers on smart phones. However, if one would like to build a classifier model in Sensor Hub, one challenging issue is to reduce the model size. One approach to reduce the model size of classifiers is feature selection. Feature selection reduces the model size by removing features in the feature set. Nonetheless, because sensor space is limited, removing features could reduce accuracy of classifier algorithm significantly. Therefore we explore feature-value selection concept, which considers the value rather than the feature to reduce the model size while preserving accuracy of classifiers. In this paper, we propose three feature-value selection methods, which consider confusion and redundancy among the feature-value. Due to the nature of feature-values, discretization of sensor data is important. We design a discretization method, LGD (Length Gini Discretization) and compare it with another method, MDLP (Minimum Description Length Discretization), to discretize sensor data using confusion metric to choose the cut point. Extensive experiments are conducted to evaluate our proposed feature-value selection methods. Feature-value removal allows us to reduce up to 80% of the model size and maintain average accuracy performance to 86%.
dc.format.extent 208 bytes-
dc.format.mimetype text/html-
dc.relation (關聯) International Conference on Data Science and Advanced Analytics (DSAA), Shanghai, China, October 30-November 1, 2014, 319-325
dc.title (題名) On Selecting Feature-Value Pairs on Smart Phones for Activity Inferences
dc.type (資料類型) conference
dc.identifier.doi (DOI) 10.1109/DSAA.2014.7058091
dc.doi.uri (DOI) http://dx.doi.org/10.1109/DSAA.2014.7058091