<s>
Automatic	B-General_Concept
taxonomy	I-General_Concept
construction	I-General_Concept
(	O
ATC	O
)	O
is	O
the	O
use	O
of	O
software	O
programs	O
to	O
generate	O
taxonomical	O
classifications	O
from	O
a	O
body	O
of	O
texts	O
called	O
a	O
corpus	O
.	O
</s>
<s>
ATC	O
is	O
a	O
branch	O
of	O
natural	B-Language
language	I-Language
processing	I-Language
,	O
which	O
in	O
turn	O
is	O
a	O
branch	O
of	O
artificial	B-Application
intelligence	I-Application
.	I-Application
</s>
<s>
)	O
,	O
such	O
as	O
in	O
the	O
form	O
of	O
a	O
library	O
classification	O
system	O
,	O
or	O
a	O
search	B-Application
engine	I-Application
taxonomy	I-Application
,	O
so	O
that	O
users	O
can	O
more	O
easily	O
find	O
the	O
information	O
they	O
are	O
searching	O
for	O
.	O
</s>
<s>
Many	O
taxonomies	O
are	O
hierarchies	O
(	O
and	O
thus	O
,	O
have	O
an	O
intrinsic	O
tree	B-Data_Structure
structure	I-Data_Structure
)	O
,	O
but	O
not	O
all	O
are	O
.	O
</s>
<s>
Manually	O
developing	O
and	O
maintaining	O
a	O
taxonomy	O
is	O
a	O
labor-intensive	O
task	O
requiring	O
significant	O
time	O
and	O
resources	O
,	O
including	O
familiarity	O
of	O
or	O
expertise	O
in	O
the	O
taxonomy	O
's	O
domain	B-Algorithm
(	O
scope	O
,	O
subject	O
,	O
or	O
field	O
)	O
,	O
which	O
drives	O
the	O
costs	O
and	O
limits	O
the	O
scope	O
of	O
such	O
projects	O
.	O
</s>
<s>
Also	O
,	O
domain	B-Algorithm
modelers	O
have	O
their	O
own	O
points	O
of	O
view	O
which	O
inevitably	O
,	O
even	O
if	O
unintentionally	O
,	O
work	O
their	O
way	O
into	O
the	O
taxonomy	O
.	O
</s>
<s>
ATC	O
uses	O
artificial	B-Application
intelligence	I-Application
techniques	O
to	O
quickly	O
automatically	O
generate	O
a	O
taxonomy	O
for	O
a	O
domain	B-Algorithm
in	O
order	O
to	O
avoid	O
these	O
problems	O
and	O
remove	O
limitations	O
.	O
</s>
<s>
Other	O
approaches	O
use	O
machine	O
learning	O
techniques	O
such	O
as	O
Bayesian	O
inferencing	O
and	O
Artificial	B-Architecture
Neural	I-Architecture
Networks	I-Architecture
.	O
</s>
<s>
One	O
approach	O
to	O
building	O
a	O
taxonomy	O
is	O
to	O
automatically	O
gather	O
the	O
keywords	O
from	O
a	O
domain	B-Algorithm
using	O
keyword	B-General_Concept
extraction	I-General_Concept
,	O
then	O
analyze	O
the	O
relationships	O
between	O
them	O
(	O
see	O
Hyponymy	O
,	O
below	O
)	O
,	O
and	O
then	O
arrange	O
them	O
as	O
a	O
taxonomy	O
based	O
on	O
those	O
relationships	O
.	O
</s>
<s>
ATC	O
can	O
be	O
used	O
to	O
build	O
taxonomies	B-Application
for	I-Application
search	I-Application
engines	I-Application
,	O
to	O
improve	O
search	O
results	O
.	O
</s>
<s>
ATC	O
systems	O
are	O
a	O
key	O
component	O
of	O
ontology	B-General_Concept
learning	I-General_Concept
(	O
also	O
known	O
as	O
automatic	O
ontology	O
construction	O
)	O
,	O
and	O
have	O
been	O
used	O
to	O
automatically	O
generate	O
large	O
ontologies	O
for	O
domains	O
such	O
as	O
insurance	O
and	O
finance	O
.	O
</s>
<s>
They	O
have	O
also	O
been	O
used	O
to	O
enhance	O
existing	O
large	O
networks	O
such	O
as	O
Wordnet	B-General_Concept
to	O
make	O
them	O
more	O
complete	O
and	O
consistent	O
.	O
</s>
<s>
Other	O
names	O
for	O
automatic	B-General_Concept
taxonomy	I-General_Concept
construction	I-General_Concept
include	O
:	O
</s>
