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Table 10.3
Features for the OHSUMED corpus
ID
Feature description
t i q d TF(t i ,d) in title
1
t i q d log (TF(t i ,d)
2
+
1 ) in title
t i q d
TF(t i ,d)
LEN(d) in title
3
t i q d log ( TF(t i ,d)
4
+
1 ) in title
LEN(d)
t i q log ( | C
5
IDF(t i )) in title
t i q log ( log ( | C
6
IDF(t i ))) in title
t i q log (
|
TF(t i ,C)
|
C
7
+
1 ) in title
t i q d log ( TF(t i ,d)
8
·
log (
|
C
IDF(t i ))
+
1 ) in title
LEN(d)
t i q d TF(t i ,d) ·
9
log ( | C
IDF(t i )) in title
t i q d log ( TF(t i ,d)
|
TF(t i ,C)
|
C
10
·
+
1 ) in title
LEN(d)
11
BM25 of title
12
log(BM25) of title
13
LMIR.DIR of title
14
LMIR.JM of title
15
LMIR.ABS of title
t i q d TF(t i ,d) in abstract
16
t i q d log (TF(t i ,d)
17
+
1 ) in abstract
t i q d
TF(t i ,d)
LEN(d) in abstract
18
t i q d log ( TF(t i ,d)
19
+
1 ) in abstract
LEN(d)
t i q log ( | C
20
IDF(t i )) in abstract
t i q log ( log ( | C
21
IDF(t i ))) in abstract
t i q log (
|
TF(t i ,C)
|
C
22
+
1 ) in abstract
t i q d log ( TF(t i ,d)
23
·
log (
|
C
IDF(t i ))
+
1 ) in abstract
LEN(d)
t i q d TF(t i ,d) ·
24
log ( | C
IDF(t i )) in abstract
t i q d log ( TF(t i ,d)
|
TF(t i ,C)
|
C
25
·
+
1 ) in abstract
LEN(d)
26
BM25 of abstract
27
log(BM25) of abstract
28
LMIR.DIR of abstract
29
LMIR.JM of abstract
30
LMIR.ABS of abstract
t i q d TF(t i ,d) in 'title
31
+
abstract'
t i q d log (TF(t i ,d)
32
+
1 ) in 'title
+
abstract'
t i q d
TF(t i ,d)
LEN(d) in 'title
33
+
abstract'
t i q d log ( TF(t i ,d)
34
+
1 ) in 'title
+
abstract'
LEN(d)
t i q log ( | C IDF(t i )) in 'title
35
+
abstract'
t i q log ( log ( | C IDF(t i ))) in 'title
36
+
abstract'
t i q log (
| C |
TF(t i ,C)
37
+
1 ) in 'title
+
abstract'
t i q d log ( TF(t i ,d)
38
·
log ( | C
IDF(t i )) +
1 ) in 'title
+
abstract'
LEN(d)
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