SECTION 4 HIGHLIGHTS THE MANAGEMENT OF THE INTER-FORMANCE OF A SYSTEM...
9
. Here,
*,+
?
measures the rel-
then considered to be a candidate answer passage.
-
to a particular document
evance of a subtopic
,
The text window of each candidate answer passage
.-
to an-
while
*/+
G
measures the relevance of
is then expanded to include the following sentence.
other subtopic,
B
.
If the answer rank does not increase with the addi-
We use a different learner for each subtopic in or-
tion of the succeeding sentence, then the price (
!
) of
der to train simultaneously on each iteration. (The
the candidate answer passage is incremented by 1,
calculation of topic signatures continues to iterate
otherwise it is decremented by 1. The text window
until there are no more relations that can be added
of each candidate answer passage continues to ex-
to the overall topic signature.) When the precision
pand until
!
_^
. Before the ranked list of candidate
is computed, it takes
of a relation to a subtopic
answers can be considered by the Question Genera-
into account the negative evidence of its relevance
tion module, answer passages with a positive price
!
8
B
. If
to any other subtopic
JI
JKML
,
are stripped of the last
!
sentences.
the relation is not included in the topic signature,
ANSWER
where relations are ranked by the score
)
In the early 1970s, Egyptian President Anwar Sadat
N
validates that Egypt has a BW stockpile.
!
+
O
4 entities