<s>
The	O
Lesk	B-General_Concept
algorithm	I-General_Concept
is	O
a	O
classical	O
algorithm	O
for	O
word	B-General_Concept
sense	I-General_Concept
disambiguation	I-General_Concept
introduced	O
by	O
Michael	O
E	O
.	O
Lesk	O
in	O
1986	O
.	O
</s>
<s>
The	O
Lesk	B-General_Concept
algorithm	I-General_Concept
is	O
based	O
on	O
the	O
assumption	O
that	O
words	O
in	O
a	O
given	O
"	O
neighborhood	O
"	O
(	O
section	O
of	O
text	O
)	O
will	O
tend	O
to	O
share	O
a	O
common	O
topic	O
.	O
</s>
<s>
A	O
simplified	O
version	O
of	O
the	O
Lesk	B-General_Concept
algorithm	I-General_Concept
is	O
to	O
compare	O
the	O
dictionary	O
definition	O
of	O
an	O
ambiguous	O
word	O
with	O
the	O
terms	O
contained	O
in	O
its	O
neighborhood	O
.	O
</s>
<s>
Versions	O
have	O
been	O
adapted	O
to	O
use	O
WordNet	B-General_Concept
.	O
</s>
<s>
In	O
Simplified	O
Lesk	B-General_Concept
algorithm	I-General_Concept
,	O
the	O
correct	O
meaning	O
of	O
each	O
word	O
in	O
a	O
given	O
context	O
is	O
determined	O
individually	O
by	O
locating	O
the	O
sense	O
that	O
overlaps	O
the	O
most	O
between	O
its	O
dictionary	O
definition	O
and	O
the	O
given	O
context	O
.	O
</s>
<s>
(	O
2004	O
)	O
has	O
shown	O
that	O
the	O
simplified	O
Lesk	B-General_Concept
algorithm	I-General_Concept
can	O
significantly	O
outperform	O
the	O
original	O
definition	O
of	O
the	O
algorithm	O
,	O
both	O
in	O
terms	O
of	O
precision	O
and	O
efficiency	O
.	O
</s>
<s>
By	O
evaluating	O
the	O
disambiguation	B-General_Concept
algorithms	O
on	O
the	O
Senseval-2	O
English	O
all	O
words	O
data	O
,	O
they	O
measure	O
a	O
58%	O
precision	O
using	O
the	O
simplified	O
Lesk	B-General_Concept
algorithm	I-General_Concept
compared	O
to	O
the	O
only	O
42%	O
under	O
the	O
original	O
algorithm	O
.	O
</s>
<s>
implementation	O
considers	O
a	O
back-off	O
strategy	O
for	O
words	O
not	O
covered	O
by	O
the	O
algorithm	O
,	O
consisting	O
of	O
the	O
most	O
frequent	O
sense	O
defined	O
in	O
WordNet	B-General_Concept
.	O
</s>
<s>
This	O
means	O
that	O
words	O
for	O
which	O
all	O
their	O
possible	O
meanings	O
lead	O
to	O
zero	O
overlap	O
with	O
current	O
context	O
or	O
with	O
other	O
word	O
definitions	O
are	O
by	O
default	O
assigned	O
sense	O
number	O
one	O
in	O
WordNet.	O
"	O
</s>
<s>
The	O
original	O
Lesk	B-General_Concept
algorithm	I-General_Concept
defines	O
the	O
context	O
in	O
a	O
more	O
complex	O
way	O
.	O
</s>
<s>
Adapted/Extended	O
Lesk	O
(	O
Banerjee	O
and	O
Pederson	O
,	O
2002/2003	O
)	O
:	O
In	O
the	O
adaptive	O
lesk	B-General_Concept
algorithm	I-General_Concept
,	O
a	O
word	O
vector	O
is	O
created	O
corresponds	O
to	O
every	O
content	O
word	O
in	O
the	B-General_Concept
wordnet	I-General_Concept
gloss	O
.	O
</s>
<s>
Concatenating	O
glosses	O
of	O
related	O
concepts	O
in	O
WordNet	B-General_Concept
can	O
be	O
used	O
to	O
augment	O
this	O
vector	O
.	O
</s>
