non-linear dimension reduction via Autoencoder

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abassidodo
abassidodo 2017-10-5
回答： Tommi Kärkkäinen 2022-11-9
hello all, I am trying to use the Matlab implementation of autoencoder to reduce the dimension of 1509 samples of Bag-of-visual word models of images, but I am surprised that while the image classification without dimension reduction recorded about 50% accuracy, and Matlab's PCA improved it to 60% but the Matlab implementation of autoencoder (with logsig activation and default values for all the parameters) reduced it to 40%. I expect higher accuracy from autoencoder, what can be the problem?

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BERGHOUT Tarek
BERGHOUT Tarek 2019-4-11
1) try to normalize you data first, between 0 and 1.
2) use these autoencoders and tell me the difference
https://www.mathworks.com/matlabcentral/fileexchange/66080-auto-encoder-based-extreme-learning-machine?s_tid=prof_contriblnk
Tommi Kärkkäinen
Tommi Kärkkäinen 2022-11-9

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