Intelligent Database Systems Lab

國立雲林科技大學National Yunlin University of Science and Technology

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AC-ViSOM: Hybridising the Modified Adaptive Coordinate (AC) and ViSOM for Data Visualization

Md. Sarwar Zahan Tapan, Teh Chee SiongITSim, 2009

Presented by Hung-Yi Tsai2011/8/24

Intelligent Database Systems Lab

N.Y.U.S.T.

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Outlines· Motivation· Objectives· Methodology· Experiments· Conclusions· Comments

Intelligent Database Systems Lab

N.Y.U.S.T.

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Motivation

· ViSOM requires a large amount of neurons in the network to effectively represent the data.

· But ViSOM suffer from dead neuron problem.

Intelligent Database Systems Lab

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Objectives

· To propose a modified Adaptive Coordinate (AC) approach is hybridised with ViSOM to address the above-mentioned issues.

· The basic idea of AC approach is to mirror the movements and locations in the SOM projecting activity.

Intelligent Database Systems Lab

N.Y.U.S.T.

I. M.Methodology

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· SOM

Intelligent Database Systems Lab

N.Y.U.S.T.

I. M.Methodology

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· Visualization induced SOM(ViSOM)

Intelligent Database Systems Lab

N.Y.U.S.T.

I. M.Methodology

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· Adaptive Coordinates(AC)

Intelligent Database Systems Lab

N.Y.U.S.T.

I. M.Methodology

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· AC-ViSOM

Intelligent Database Systems Lab

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· 2D Gaussian data set…

Experiments

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Dead Neurons 67.7%

MSE 0.0639

Intelligent Database Systems Lab

N.Y.U.S.T.

I. M.

· 2D Gaussian data set…

Experiments

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Dead Neurons 17.5%

MSE 0.0282

Intelligent Database Systems Lab

N.Y.U.S.T.

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· 3D synthetic data set…

Experiments

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Dead Neurons 68.4%

MSE 0.048

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· 3D synthetic data set…

Experiments

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Dead Neurons 31.0%

MSE 0.024

Intelligent Database Systems Lab

N.Y.U.S.T.

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· Wisconsin Breast Cancer (WBC)..

Experiments

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Dead Neurons 84.7%

MSE 0.375

Dead Neurons 34.5%

MSE 0.193

Intelligent Database Systems Lab

N.Y.U.S.T.

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Conclusions

· AC-ViSOM is able to minimize the number of dead neurons in the map as well as optimize the data representation.

Intelligent Database Systems Lab

N.Y.U.S.T.

I. M.

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Comments

· Advantages─ None.

· Drawbacks─ Some wrong.

· Applications─ Data Visualization in ANN