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Summary of the four approaches explored for incorporating unlabeled data in breast CADx.
| Method type | Stage 1 | Stage 2 | |
|---|---|---|---|
| Unsupervised DR | Supervised classifier | ||
| 1 | Transductive DR regularization | PCA (linear) | BANN |
| 2 | Transductive DR regularization | Laplacian eigenmaps (nonlinear) | BANN |
| 3 | Transductive DR regularization | t-SNE (nonlinear) | BANN |
| 4 | Manifold regularization | Combined stages using semisupervised algorithm: LapSVM | |
