som of soms
DESCRIPTION
SOM of SOMs. Presenter : Cheng-Feng Weng Authors : Tetsuo Furukawa 2009/07/09. NN.16 (2009). Outline. Motivation Objective Method Experiments Conclusion Comments. Motivation. The SOM provides a map of data vectors, but not a map of class distributions. Class confusion. - PowerPoint PPT PresentationTRANSCRIPT
Intelligent Database Systems Lab
國立雲林科技大學National Yunlin University of Science and Technology
SOM of SOMs
Presenter : Cheng-Feng Weng
Authors :Tetsuo Furukawa
2009/07/09
NN.16 (2009)
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Outline
Motivation Objective Method Experiments Conclusion Comments
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Motivation
The SOM provides a map of data vectors, but not a map of class distributions.
Class confusion
Attribute
X
Y
Z
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linear manifold
Motivation (cont.)
Manifold can be seen a class distributions.
viewpoint manifold
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Objective
The paper is to propose a method of mapping class called SOMs that can represent the relationships between distributions.
The manifold gradually changes shape.
15 classes
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The SOMs
It is a hierarchical structure of a set of child SOMs and a single parent SOM.
Bottle up
Manifold
Class distributions
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The SOMs algorithm
1. There are J child SOMs and a parent SOM map.
2. Children and parent maps have own parameters.
3. Randomize parent SOM map, and use least qe map to replace child’s.
4. Class maps are estimated for each class dataset.
5. The BMMs are regarded as data vectors for parent map.
6. Update child’s weights by overwriting its BMM.
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An Example for the SOMs
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Experiments
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Experiments (cont.)
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Application to autonomous mobile robot
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Conclusion
The essence of the algorithm is to generate a higher rank of data representation with class information as a clue, and the given datasets are modeled by fitting to a fiber bundle.
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Comments
Advantage From a class point of view Inversed construction
Drawback …
Application Class manifold LDA + SOM vs. SOM + LVQ