Abstract
Two-Dimensional Neural Network (2D CNN) has become an alternative method for one-dimensional data classification. Previous studies are focused either only on sequence or vector data. In this paper, we proposed a new 2D CNN classification method that suitable for both, sequence and vector data. The Hilbert space-filling curve was used as a 1D to 2D transfer function in the proposed method. It is used for two reasons: (i) to preserve the spatial locality of 1D data and (ii) to reduce the distance of far-flung data elements. Furthermore, a 1D convolution layer was added in the first stage of our proposed method. It can capture the correlation information of neighboring elements, which is effective for sequence data classification. Consequently, the trainable property of 1D convolutions is very helpful in extracting relevant information for vector data classification. Finally, the performance of the proposed Hilbert Vector Convolutional Neural Network (HVCNN) was compared with two 2D CNN based methods and two non-CNN based methods. Experimental results showed that the proposed HVCNN method delivers better numerical accuracy and generalization property than the other competitive methods. We also did weight distribution analysis to support this claim.
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Acknowledgment
This work was partly supported by JSPS KAKENHI Grant Number 16K00239. The authors also thank the Institute of Education Fund Management (LPDP) of the Ministry of Finance of Indonesia, which has provided scholarship support for the first author to undertake the master program.
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Loka, N.R.B.S., Kavitha, M., Kurita, T. (2019). Hilbert Vector Convolutional Neural Network: 2D Neural Network on 1D Data. In: Tetko, I., Kůrková, V., Karpov, P., Theis, F. (eds) Artificial Neural Networks and Machine Learning – ICANN 2019: Theoretical Neural Computation. ICANN 2019. Lecture Notes in Computer Science(), vol 11727. Springer, Cham. https://doi.org/10.1007/978-3-030-30487-4_36
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