Semisupervised Tangent Space Discriminant Analysis

Figure 1

Illustrative examples of STSD, LDA, and PCA on the two-moon data set under different label configurations. The circles and squares denote the data points in positive and negative classes, and the filled or unfilled symbols denote the labeled or unlabeled data, respectively.

(a) 6 labeled

(b) 10 labeled

(c) 50 labeled

(d) 80 labeled