<s>
Feature	B-Language
Selection	I-Language
Toolbox	I-Language
(	O
FST	O
)	O
is	O
software	O
primarily	O
for	O
feature	B-General_Concept
selection	I-General_Concept
in	O
the	O
machine	O
learning	O
domain	O
,	O
written	O
in	O
C++	B-Language
,	O
developed	O
at	O
the	O
Institute	O
of	O
Information	O
Theory	O
and	O
Automation	O
(	O
UTIA	O
)	O
,	O
of	O
the	O
Czech	O
Academy	O
of	O
Sciences	O
.	O
</s>
<s>
The	O
first	O
generation	O
of	O
Feature	B-Language
Selection	I-Language
Toolbox	I-Language
(	O
FST1	O
)	O
was	O
a	O
Windows	O
application	O
with	O
user	B-Application
interface	I-Application
allowing	O
users	O
to	O
apply	O
several	O
sub-optimal	O
,	O
optimal	O
and	O
mixture-based	O
feature	B-General_Concept
selection	I-General_Concept
methods	O
on	O
data	O
stored	O
in	O
a	O
trivial	O
proprietary	O
textual	O
flat	O
file	O
format	O
.	O
</s>
<s>
The	O
third	O
generation	O
of	O
Feature	B-Language
Selection	I-Language
Toolbox	I-Language
(	O
FST3	O
)	O
was	O
a	O
library	B-Library
without	O
user	B-Application
interface	I-Application
,	O
written	O
to	O
be	O
more	O
efficient	O
and	O
versatile	O
than	O
the	O
original	O
FST1	O
.	O
</s>
<s>
FST3	O
supports	O
several	O
standard	O
data	B-Application
mining	I-Application
tasks	O
,	O
more	O
specifically	O
,	O
data	B-General_Concept
preprocessing	I-General_Concept
and	O
classification	B-General_Concept
,	O
but	O
its	O
main	O
focus	O
is	O
on	O
feature	B-General_Concept
selection	I-General_Concept
.	O
</s>
<s>
In	O
feature	B-General_Concept
selection	I-General_Concept
context	O
,	O
it	O
implements	O
several	O
common	O
as	O
well	O
as	O
less	O
usual	O
techniques	O
,	O
with	O
particular	O
emphasis	O
put	O
on	O
threaded	B-Operating_System
implementation	O
of	O
various	O
sequential	O
search	O
methods	O
(	O
a	O
form	O
of	O
hill-climbing	B-Algorithm
)	O
.	O
</s>
<s>
Implemented	O
methods	O
include	O
individual	O
feature	O
ranking	O
,	O
floating	O
search	O
,	O
oscillating	O
search	O
(	O
suitable	O
for	O
very	O
high-dimension	O
problems	O
)	O
in	O
randomized	O
or	O
deterministic	O
form	O
,	O
optimal	O
methods	O
of	O
branch	B-Algorithm
and	I-Algorithm
bound	I-Algorithm
type	O
,	O
probabilistic	O
class	O
distance	O
criteria	O
,	O
various	O
classifier	B-General_Concept
accuracy	O
estimators	O
,	O
feature	O
subset	O
size	O
optimization	O
,	O
feature	B-General_Concept
selection	I-General_Concept
with	O
pre-specified	O
feature	O
weights	O
,	O
criteria	O
ensembles	O
,	O
hybrid	O
methods	O
,	O
detection	O
of	O
all	O
equivalent	O
solutions	O
,	O
or	O
two-criterion	O
optimization	O
.	O
</s>
<s>
FST3	O
is	O
more	O
narrowly	O
specialized	O
than	O
popular	O
software	O
like	O
the	O
Waikato	O
Environment	O
for	O
Knowledge	O
Analysis	O
Weka	B-Language
,	O
RapidMiner	B-Algorithm
or	O
PRTools	O
.	O
</s>
<s>
By	O
default	O
,	O
techniques	O
implemented	O
in	O
the	O
toolbox	O
are	O
predicated	O
on	O
the	O
assumption	O
that	O
the	O
data	O
is	O
available	O
as	O
a	O
single	O
flat	O
file	O
in	O
a	O
simple	O
proprietary	O
format	O
or	O
in	O
Weka	B-Language
format	O
ARFF	O
,	O
where	O
each	O
data	O
point	O
is	O
described	O
by	O
a	O
fixed	O
number	O
of	O
numeric	O
attributes	O
.	O
</s>
<s>
FST3	O
is	O
provided	O
without	O
user	B-Application
interface	I-Application
,	O
and	O
is	O
meant	O
to	O
be	O
used	O
by	O
users	O
familiar	O
both	O
with	O
machine	O
learning	O
and	O
C++	B-Language
programming	O
.	O
</s>
<s>
The	O
older	O
FST1	O
software	O
is	O
more	O
suitable	O
for	O
simple	O
experimenting	O
or	O
educational	O
purposes	O
because	O
it	O
can	O
be	O
used	O
with	O
no	O
need	O
to	O
code	O
in	O
C++	B-Language
.	O
</s>
<s>
In	O
1999	O
,	O
development	O
of	O
the	O
first	O
Feature	B-Language
Selection	I-Language
Toolbox	I-Language
version	O
started	O
at	O
UTIA	O
as	O
part	O
of	O
a	O
PhD	O
thesis	O
.	O
</s>
<s>
It	O
was	O
originally	O
developed	O
in	O
Optima++	O
(	O
later	O
renamed	O
Power++	O
)	O
RAD	O
C++	B-Language
environment	O
.	O
</s>
<s>
In	O
2002	O
,	O
the	O
development	O
of	O
the	O
first	O
FST	O
generation	O
has	O
been	O
suspended	O
,	O
mainly	O
due	O
to	O
end	O
of	O
Sybase	B-Application
's	O
support	O
of	O
the	O
then	O
used	O
development	O
environment	O
.	O
</s>
<s>
In	O
2010	O
,	O
FST3	O
was	O
made	O
publicly	O
available	O
in	O
form	O
of	O
a	O
C++	B-Language
library	B-Library
without	O
GUI	O
.	O
</s>
<s>
The	O
accompanying	O
webpage	O
collects	O
feature	B-General_Concept
selection	I-General_Concept
related	O
links	O
,	O
references	O
,	O
documentation	O
and	O
the	O
original	O
FST1	O
available	O
for	O
download	O
.	O
</s>
