Video Cataloguing

Saunder August 4, 2015 16:30 K23081˙C002

Visual Features Extraction



23

activation [103]. The output weights W ∈

R

K ×N

and biases b ∈

R

K

so that

the feature mapping f is

f (x) = g(Wx + b) (2.17)

where g (z) = 1/(1 +exp(−z)) is the logistic sigmoid function.

Sparse restricted Boltzmann machine. A restricted Boltzmann machine (RBM)

is a generative model. The RBM is likely the most popular subclass of

Boltzmann machine [171]. The RBM can be said to form a bipartite graph

with the visibles and the hidden forming two layers of vertices in the graph

(and no connection between units of the same layer) with K binary hidden

variables. Sparse RBMs can be trained using ...