10 2. WHAT NEWS CONTENT TELLS
2.1.2 LOW-RANK TEXTUAL FEATURES
k
Matrix Factorization
X 2 R
nd
C
F 2 R
N k
C
V 2 R
d k
C
min
F;V0
X FV
T
2
F
;
d k
R V
Tensor Factorization
X 2 R
N dd
X
i;W;W
S
S.i; j / i j
X
X ŒF; B; H D
R
X
rD1
r
f
r
ˇ b
r
ˇ h
r
;
ˇ f
r
b
r
h
r
r
F B H R F