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2. sparse-overcomplete representations
3. present several potential advantages
4. biological vision
5. optimization problem
6. code units
7. loss function
8. feature extraction
9. handwritten numerals and natural image patches
10. separate module
11. by a small margin
12. is reminiscent of
13. topographic maps
14. visual cortex
15. measures the discrepancy between
16. exponentially decaying
17. recursive equation
18. step function
19. convex quadratic optimization problem
20. iterate these two steps in alternation until convergence
21. low-pass filtering
22. Unsupervised learning
23. validation set
24. elastic distortions
25. classification, compression,denoising, inpainting, segmentation, and superresolution interpolation
26. facial feature extraction,image denoising, image compression, inpainting, classification, and invariant feature extraction
27. Wavelet decomposition, PCA, Kernel-PCA, Non-Negative Matrix Factorization , and ICA
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