<s>
Approximate	B-General_Concept
inference	I-General_Concept
methods	O
make	O
it	O
possible	O
to	O
learn	O
realistic	O
models	O
from	O
big	B-Application
data	I-Application
by	O
trading	O
off	O
computation	O
time	O
for	O
accuracy	O
,	O
when	O
exact	O
learning	O
and	O
inference	O
are	O
computationally	O
intractable	O
.	O
</s>
