2.1. TEXTUAL FEATURES 11
2.1.3 NEURAL TEXTUAL FEATURES
             
            
            
           
           
           
CNN
               
                
            
              
            
             
     w
i
        k 
    w
i
2 R
k
   n     
w
1Wn
D w
1
˚ w
2
w
n
; 
 ˚          h  
   h            
Qw
i
D .W w
iWiCh1
/ 
 ./       W         
                  
Qw D ΠQw
1
; Qw
2
; ; Qw
nhC1

    t           
              
               
   
RNN
              
            
       
                
             
              
12 2. WHAT NEWS CONTENT TELLS
             
              
          
             
             
              
             
           
           
            
           
                
           
             
   
!
h
it
D
!
GRU.w
it
/; t 2 f1; : : : ; M
i
g
h
it
D
GRU.w
it
/; t 2 f1; : : : ; M
i
g:

      w
it
     
!
h
it

  
h
it
 h
it
D Œ
!
h
it
;
h
it
      
   w
i
         
             
           v
i
2 R
2d1
  

v
i
D
M
i
X
tD1
˛
it
h
it
; 
2.1. TEXTUAL FEATURES 13
Sentence EncoderWord Encoder
a
o
s
α
α
α
N
α

α

α
M
o
w
h
h
h
N
v
v
v
N
h
h
h
N
h

h

h
M
w

w

w
M
h

h

h
M
······
······
······
······
······
······
······
            
   
 ˛
it
    t
th
    s
i
 ˛
it
   
o
it
D tanh.W
w
h
it
C b
w
/
˛
it
D
exp.o
it
o
T
w
/
P
M
i
kD1
exp.o
ik
o
T
w
/
;

 o
it
     h
it
      h
it
  
   o
w
         
           
!
h
i
D
!
GRU.v
i
/; i 2 f1; : : : ; N g
h
i
D
GRU.v
i
/; i 2 fN; : : : ; 1g:

      h
i
2 R
2d1
     
!
h
i
   
h
i
 h
i
D Œ
!
h
i
;
h
i
     
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