Self-Organizing Maps and Their Applications in Image Processing, Information Organization, and Retrieval - Nonlinear Signal and Image Processing: Theory, Methods and Applications - page 421

'History' category

1

MMWQWEBSOM
Standard WEBSOM

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

Recall

FIGURE 11.9
Average recall-precision curves for the SOM and the MMSOM in document retrieval from the
Hypergeo corpus. The sample test document was classified into the “history” category.

'Mergers and Acquisitions' category

0.55

Wilcoxon SOM
Standard SOM

0.5

0.45

0.4

0.35

0.3

0.25

0.2

0.15

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

Recall

FIGURE 11.10
Average recall-precision curve for the SOM and the Wilcoxon SOM for the “Mergers and Acqui-
sitions (ACQ)” category.