<s>
SNNS	B-Algorithm
(	O
Stuttgart	B-Algorithm
Neural	I-Algorithm
Network	I-Algorithm
Simulator	I-Algorithm
)	O
is	O
a	O
neural	B-Algorithm
network	I-Algorithm
simulator	I-Algorithm
originally	O
developed	O
at	O
the	O
University	O
of	O
Stuttgart	O
.	O
</s>
<s>
While	O
it	O
was	O
originally	O
built	O
for	O
X11	B-Operating_System
under	O
Unix	B-Application
,	O
there	O
are	O
Windows	B-Application
ports	O
.	O
</s>
<s>
SNNS	B-Algorithm
is	O
written	O
around	O
a	O
simulation	O
kernel	O
to	O
which	O
user	O
written	O
activation	O
functions	O
,	O
learning	O
procedures	O
and	O
output	O
functions	O
can	O
be	O
added	O
.	O
</s>
<s>
It	O
has	O
support	O
for	O
arbitrary	O
network	O
topologies	O
and	O
the	O
standard	O
release	O
contains	O
support	O
for	O
a	O
number	O
of	O
standard	O
neural	B-Architecture
network	I-Architecture
architectures	O
and	O
training	O
algorithms	O
.	O
</s>
<s>
There	O
is	O
currently	O
no	O
ongoing	O
active	O
development	O
of	O
SNNS	B-Algorithm
.	O
</s>
<s>
In	O
July	O
2008	O
the	O
license	O
was	O
changed	O
to	O
the	O
GNU	B-Application
LGPL	I-Application
.	O
</s>
