<s>
Dlib	B-Language
is	O
a	O
general	O
purpose	O
cross-platform	B-Operating_System
software	I-Operating_System
library	B-Library
written	O
in	O
the	O
programming	O
language	O
C++	B-Language
.	O
</s>
<s>
Its	O
design	O
is	O
heavily	O
influenced	O
by	O
ideas	O
from	O
design	B-Application
by	I-Application
contract	I-Application
and	O
component-based	B-Architecture
software	I-Architecture
engineering	I-Architecture
.	O
</s>
<s>
Thus	O
it	O
is	O
,	O
first	O
and	O
foremost	O
,	O
a	O
set	O
of	O
independent	O
software	B-Architecture
components	I-Architecture
.	O
</s>
<s>
It	O
is	O
open-source	B-Application
software	I-Application
released	O
under	O
a	O
Boost	O
Software	O
License	O
.	O
</s>
<s>
Since	O
development	O
began	O
in	O
2002	O
,	O
Dlib	B-Language
has	O
grown	O
to	O
include	O
a	O
wide	O
variety	O
of	O
tools	O
.	O
</s>
<s>
As	O
of	O
2016	O
,	O
it	O
contains	O
software	B-Architecture
components	I-Architecture
for	O
dealing	O
with	O
networking	B-Architecture
,	O
threads	B-Operating_System
,	O
graphical	B-Application
user	I-Application
interfaces	I-Application
,	O
data	B-General_Concept
structures	I-General_Concept
,	O
linear	B-Language
algebra	I-Language
,	O
machine	O
learning	O
,	O
image	B-Algorithm
processing	I-Algorithm
,	O
data	B-Application
mining	I-Application
,	O
XML	B-Protocol
and	O
text	O
parsing	O
,	O
numerical	O
optimization	O
,	O
Bayesian	O
networks	O
,	O
and	O
many	O
other	O
tasks	O
.	O
</s>
<s>
In	O
recent	O
years	O
,	O
much	O
of	O
the	O
development	O
has	O
been	O
focused	O
on	O
creating	O
a	O
broad	O
set	O
of	O
statistical	O
machine	O
learning	O
tools	O
and	O
in	O
2009	O
Dlib	B-Language
was	O
published	O
in	O
the	O
Journal	O
of	O
Machine	O
Learning	O
Research	O
.	O
</s>
