<s>
A	O
champion	B-General_Concept
list	I-General_Concept
,	O
also	O
called	O
top	O
doc	O
or	O
fancy	B-General_Concept
list	I-General_Concept
is	O
a	O
precomputed	O
list	O
sometimes	O
used	O
with	O
the	O
vector	O
space	O
model	O
to	O
avoid	O
computing	O
relevancy	O
rankings	O
for	O
all	O
documents	O
each	O
time	O
a	O
document	O
collection	O
is	O
queried	O
.	O
</s>
<s>
The	O
champion	B-General_Concept
list	I-General_Concept
contains	O
a	O
set	O
of	O
n	O
documents	O
with	O
the	O
highest	O
weights	O
for	O
the	O
given	O
term	O
.	O
</s>
<s>
There	O
are	O
two	O
types	O
of	O
champion	B-General_Concept
lists	I-General_Concept
,	O
champion	B-General_Concept
list	I-General_Concept
and	O
global	O
champion	B-General_Concept
list	I-General_Concept
.	O
</s>
