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@inproceedings{Lee1996UnsupervisedLB, title={Unsupervised Learning by Convex and Conic Coding}, author={Daniel D. Lee and H. Sebastian Seung}, booktitle={NIPS}, year={1996} }

- Published 1996 in NIPS

Unsupervised learning algorithms based on convex and conic encoders are proposed. The encoders find the closest convex or conic combination of basis vectors to the input. The learning algorithms produce basis vectors that minimize the reconstruction error of the encoders. The convex algorithm develops locally linear models of the input, while the conic algorithm discovers features. Both algorithms are used to model handwritten digits and compared with vector quantization and principal componentâ€¦Â CONTINUE READING

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This paper has 183 citations. REVIEW CITATIONS

- With r = 25 patterns per digit class, Convex incorrectly classified 113 digits out of the 2007 test examples for an overall error rate of 5.6%.
- However, scaling up the convex models to r = 100 patterns results in an error rate of 4.4% (89 errors).
- On the other hand, Conic coding with r = 25 results in an error rate of 6.8% (138 errors).

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