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Scherbart, Alexandra: Looking inside ensembles of negatively correlated Self-Organizing Maps. 2009
Inhalt
List of Figures
List of Tables
Glossary
Introduction
Peak Intensity Prediction
Bias and Variance and the Trade-Off
Why apply Vector-Quantization Based Self-Organizing Maps?
Why Ensemble Learning?
Potential of SOM Ensemble Learning
Outline
Publications
Peak Intensity Prediction in a Single Learner Setup
MS data
Benchmark Datasets
Towards Peak Intensity Prediction with Machine Learning methods
Local Linear Map (LLM) - VQ-based approach
ν-Support Vector Machine
Evaluation
Issues in Data Handling
Results
Peptide Prototyping
Predicting Peaks' Intensities
Comparison Prediction Performance of SOM to NG
Subsampling of Peptides
Comparison Prediction Performance of Feature Sets
Discussion
Conclusions
Improved Peak Intensity Prediction by Adaptive Feature Weighting
Assessing the Feature Relevance
Linear Least Squares
Partial Least Squares
Random Forests
Bagged Trees
Evaluation
Results
Weighted Feature Space
Weighted and Filtered Feature Space
Discussion
Conclusions
Contribution to OpenMS - An Open-Source Framework for MS
Ensemble Learning
Reasons for the Success of Ensembles
Weak Learners
Unstable Learners
History of Ensembles
Assessing Ensemble Error
Bias-Variance-Covariance Decomposition
Ambiguity Decomposition
Assessing Diversity
Strengthening the Effect by Diverse Predictors
Bagging
Random Subspace Method
Random Forests
Negative Correlation Learning
Parameterizing Penalty Functions
LERRANCO Architecture
Related Work on SOM Ensemble Learning
Proposed LERRANCO Architecture
Accurate and Diverse Ensemble Predictors
Quantification of Intra-SOM Diversity
Related Work on SOM Ensemble Learning with NCL
Conclusion
SOMs as Accurate and Diverse Ensemble Predictors
Evaluation
Training Algorithm
Topology of Networks
Training Data
Size of Random Subspaces
Initial Conditions
Grid Size
Gaussian Neighborhood Width
Discussion
Conclusion
Negatively Correlated SOM Ensembles
LERRANCO Evaluation
Results
Inter-SOM Diversity
Intra-SOM Diversity
Dynamics of Boosted Negatively Correlated SOMs
Dynamics in Time
Dynamics in λ
Supporting Altered Penalty Functions
Discussion
Complexity and Computation Time
Conclusion
Aggregation of Hypotheses to Ensemble Prediction
Aggregation of Local Experts
Aggregation of Ensemble Predictors
Discussion
Conclusion
Feature Relevance
Feature Relevance in the Context of Ensemble Learning
Random Weighted Subspace Method
Assessing the Feature Relevance based on OOB a posteriori
Assessing the Feature Relevance based on Linear Mappings a posteriori
Robustness of Feature Relevance
Contribution of Features to Visualization
Discussion
Conclusion
Conclusions
How SOM ensembles succeed
Why SOM ensembles succeed
Outlook
Summary
Bibliography