TESI DOCTORAL - La Salle

Chapter 5. Multimedia clustering based on cluster ensembles
Data Consensus Consensus function
set type CSPA EAC HGPA MCLA ALSAD KMSAD SLSAD
λ
IsoLetters
image %exp 92.9 42.9 1.4 8.6 89.3 86.4 46.4
c
Δφ (NMI) 9 -5.2 -24.3 -12.1 8.9 10.1 3
λ speech %exp 96.4 89.3 52.9 87.1 82.1 92.9 92.9
c Δφ (NMI) 78.2 90.2 6.6 30.5 49.6 59.5 114.2
λ image+speech %exp 17.9 3.6 0 0.7 17.9 12.1 7.1
c
Δφ (NMI) -1.4 -28.6 -31.8 -22.5 -0.3 1.8 -12.7
λ
CAL500
audio %exp 7.1 17.9 8.6 1.4 7.1 7.2 28.6
c Δφ (NMI) -23.8 -10.1 -19.7 -31.9 -23.7 -25.8 -8.9
λ text %exp 96.4 53.6 32.9 80.7 100 99.3 89.3
c
Δφ (NMI) 25 0.5 -3.4 13.8 30.7 24.2 28
λ audio+text %exp 75 78.6 11.4 40.7 75 72.1 57.1
c
Δφ (NMI) 4.2 17.3 -13.1 3 7.3 5 6.8
λ
InternetAds
object %exp 57.1 57.2 90 45.7 57.1 53.6 42.9
c Δφ (NMI) 2 3 -10 104 44152 465 -38
λ collateral %exp 85.7 82.1 70.7 78.6 92.9 71.4 64.3
c
Δφ (NMI) 1250 60 -30 940 4880 105030 60
λ object+collateral %exp 42.9 67.9 75 30 71.4 55.7 32.1
c
Δφ (NMI) 479.1 41.7 -19.2 59.4 41.1 1322.6 22.2
λ
Corel
image %exp 75 10.7 3.6 7.1 17.9 6.4 3.6
c
Δφ (NMI) -0.7 -17.1 -24.4 -22.4 -10.8 -11.6 -18
λtext %exp 100 92.9 91.4 84.3 100 100 100
c
Δφ (NMI) 145.9 136.8 30.1 83.5 153.8 143.4 157.9
λ image+text %exp 14.3 46.4 14.4 5.7 14.3 14.2 17.9
c
Δφ (NMI) 6.7 1.1 -38.2 -25.2 3.2 7.5 -1.6
151
Table 5.6: Evaluation of the intermodal consensus clustering with respect to the unimodal and multimodal consensus clusterings, across
the four multimedia data collections and the seven consensus functions. The symbol %exp denotes the percentage of experiments in
which the intermodal consensus clustering is superior to the unimodal and multimodal consensus clusterings, and Δφ (NMI) stands for the
relative percentage φ (NMI) difference of the former wrt the latter.