<s>
Vowpal	B-Algorithm
Wabbit	I-Algorithm
(	O
VW	O
)	O
is	O
an	O
open-source	B-Application
fast	O
online	B-Algorithm
interactive	O
machine	O
learning	O
system	O
library	O
and	O
program	O
developed	O
originally	O
at	O
Yahoo	O
!	O
</s>
<s>
Vowpal	B-Algorithm
Wabbit	I-Algorithm
's	O
interactive	O
learning	O
support	O
is	O
particularly	O
notable	O
including	O
Contextual	O
Bandits	O
,	O
Active	B-General_Concept
Learning	I-General_Concept
,	O
and	O
forms	O
of	O
guided	O
Reinforcement	O
Learning	O
.	O
</s>
<s>
Vowpal	B-Algorithm
Wabbit	I-Algorithm
provides	O
an	O
efficient	O
scalable	O
out-of-core	B-Application
implementation	O
with	O
support	O
for	O
a	O
number	O
of	O
machine	O
learning	O
reductions	B-Algorithm
,	O
importance	O
weighting	O
,	O
and	O
a	O
selection	O
of	O
different	O
loss	O
functions	O
and	O
optimization	O
algorithms	O
.	O
</s>
<s>
Vowpal	B-Algorithm
wabbit	I-Algorithm
has	O
been	O
used	O
to	O
learn	O
a	O
tera-feature	O
(	O
1012	O
)	O
data-set	O
on	O
1000	O
nodes	O
in	O
one	O
hour	O
.	O
</s>
