<s>
Maximum	B-Algorithm
inner-product	I-Algorithm
search	I-Algorithm
(	O
MIPS	O
)	O
is	O
a	O
search	O
problem	O
,	O
with	O
a	O
corresponding	O
class	O
of	O
search	B-Application
algorithms	I-Application
which	O
attempt	O
to	O
maximise	O
the	O
inner	O
product	O
between	O
a	O
query	O
and	O
the	O
data	O
items	O
to	O
be	O
retrieved	O
.	O
</s>
<s>
MIPS	O
algorithms	O
are	O
used	O
in	O
a	O
wide	O
variety	O
of	O
big	O
data	O
applications	O
,	O
including	O
recommendation	B-Application
algorithms	I-Application
and	O
machine	O
learning	O
.	O
</s>
<s>
MIPS	O
can	O
be	O
viewed	O
as	O
equivalent	O
to	O
a	O
nearest	B-Algorithm
neighbor	I-Algorithm
search	I-Algorithm
(	O
NNS	O
)	O
problem	O
in	O
which	O
maximizing	O
the	O
inner	O
product	O
is	O
equivalent	O
to	O
minimizing	O
the	O
corresponding	O
distance	O
metric	O
in	O
the	O
NNS	O
problem	O
.	O
</s>
<s>
MIPS	O
search	O
is	O
used	O
as	O
part	O
of	O
DeepMind	B-Application
's	O
RETRO	O
algorithm	O
.	O
</s>
