76 4. CHALLENGING PROBLEMS OF FAKE NEWS DETECTION
      w
jt
 
!
h
jt

h
jt
 h
jt
D Œ
!
h
jt
;
h
jt
             
      c
j
2 R
2d
   
c
j
D
Q
j
X
tD1
ˇ
jt
h
jt
; 
 ˇ
jt
    t
th
    c
j
  ˇ
jt
  

o
jt
D .W
c
h
jt
C b
c
/
ˇ
jt
D
exp.o
jt
o
T
c
/
P
Q
j
kD1
exp.o
j
k
o
T
c
/
;

 o
jt
    h
jt
      h
jt
 
   u
c
   
Sentence-Comment Co-attention        
               
             
             Michelle Obama is so
vulgar she's not only being vocal..         Pence:
Michelle Obama Is The Most Vulgar First Lady We've Ever Had  The First
Lady denounced the Republican presidential nominee    
              
          
                  
  Where did Pence say this? I saw him on CBS this morning and
he didn't say these things..           
    Pence is absolutely right
              
                
              
             
            
             

        S D Œs
1
I ; s
L
2 R
2dL
 
     C D fc
1
; ; c
T
g 2 R
2dT
     
             
F 2 R
T L
 
F D .C
T
W
l
S/; 
4.3. EXPLAINABLE FAKE NEWS DETECTION 77
 W
l
2 R
2d2d
           
               
      
H
s
D 
.
W
s
S C .W
c
C/F
/
H
c
D 
W
c
C C .W
s
S/F
T
;

 W
s
; W
c
2 R
k2d
          
    
a
s
D softmax
w
T
hs
H
s
a
c
D softmax
w
T
hc
H
c
;

 a
s
2 R
1N
 a
c
2 R
1T
       s
i
 
c
j
 w
hs
; w
hc
2 R
1k
       F 
             F
T
 
             
         
Os D
L
X
iD1
a
s
i
s
i
; Oc D
T
X
j D1
a
c
j
c
j
; 
 Os 2 R
12d
 Oc 2 R
12d
         
 
Explainable Detection of Fake News         
              
            
         
      
Oy D softmaxOs; OcW
f
C b
f
/; 
 Oy D ŒOy
0
; Oy
1
      Oy
0
 Oy
1
   
          y 2 f0; 1g   
    ŒOs; Oc          
  b
f
2 R
12
             
     
L./ D y log.Oy
1
/ .1 y/ log.1 Oy
0
/;

      
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