Learning convolutive features for storage and transmission between networked sensors

Ruairí de Fréin

    Research output: Contribution to journalArticlepeer-review


    Discovering an efficient representation that reflects the structure of a signal ensemble is a requirement of many Machine Learning and Signal Processing methods, and gaining increasing prevalence in sensing systems. This type of represen- tation can be constructed by Convolutive Non-negative Matrix Factorization (CNMF), which finds parts-based convolutive repre- sentations of non-negative data. However, convolutive extensions of NMF have not yet considered storage efficiency as a side con- straint during the learning procedure. To address this challenge, we describe a new algorithm that fuses ideas from the 1) parts- based learning and 2) integer sequence compression literature. The resulting algorithm, Storable NMF (SNMF), enjoys the merits of both techniques: it retains the good-approximation properties of CNMF while also taking into account the size of the symbol set which is used to express the learned convolutive factors and activations. We argue that CNMF is not as amenable to transmission and storage, in networked sensing systems, as SNMF. We demonstrate that SNMF yields a compression ratio ranging from 10:1 up to 20:1, depending on the signal, which gives rise to a similar bandwidth saving for networked sensors.
    Original languageEnglish
    Pages (from-to)1-8
    JournalNeural Networks (IJCNN), 2015 International Joint Conference on
    Publication statusPublished - 2015


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