<s>
RankBrain	B-Application
is	O
a	O
machine	O
learning-based	O
search	B-Application
engine	I-Application
algorithm	O
,	O
the	O
use	O
of	O
which	O
was	O
confirmed	O
by	O
Google	B-Application
on	O
26	O
October	O
2015	O
.	O
</s>
<s>
It	O
helps	O
Google	B-Application
to	O
process	O
search	B-Application
results	I-Application
and	O
provide	O
more	O
relevant	O
search	B-Application
results	I-Application
for	O
users	O
.	O
</s>
<s>
In	O
a	O
2015	O
interview	O
,	O
Google	B-Application
commented	O
that	O
RankBrain	B-Application
was	O
the	O
third	O
most	O
important	O
factor	O
in	O
the	O
ranking	O
algorithm	O
along	O
with	O
links	O
and	O
content	O
.	O
</s>
<s>
,	O
"	O
RankBrain	B-Application
was	O
used	O
for	O
less	O
than	O
15%	O
of	O
queries.	O
"	O
</s>
<s>
The	O
results	O
show	O
that	O
RankBrain	B-Application
produces	O
results	O
that	O
are	O
well	O
within	O
10%	O
of	O
the	B-Application
Google	I-Application
search	B-Application
engine	I-Application
engineer	O
team	O
.	O
</s>
<s>
If	O
RankBrain	B-Application
sees	O
a	O
word	O
or	O
phrase	O
it	O
is	O
n’t	O
familiar	O
with	O
,	O
the	O
machine	O
can	O
make	O
a	O
guess	O
as	O
to	O
what	O
words	O
or	O
phrases	O
might	O
have	O
a	O
similar	O
meaning	O
and	O
filter	O
the	O
result	O
accordingly	O
,	O
making	O
it	O
more	O
effective	O
at	O
handling	O
never-before-seen	O
search	O
queries	O
or	O
keywords	O
.	O
</s>
<s>
Search	O
queries	O
are	O
sorted	O
into	O
word	B-General_Concept
vectors	I-General_Concept
,	O
also	O
known	O
as	O
“	O
distributed	O
representations	O
,	O
”	O
which	O
are	O
close	O
to	O
each	O
other	O
in	O
terms	O
of	O
linguistic	O
similarity	O
.	O
</s>
<s>
RankBrain	B-Application
attempts	O
to	O
map	O
this	O
query	O
into	O
words	O
(	O
entities	O
)	O
or	O
clusters	O
of	O
words	O
that	O
have	O
the	O
best	O
chance	O
of	O
matching	O
it	O
.	O
</s>
<s>
Therefore	O
,	O
RankBrain	B-Application
attempts	O
to	O
guess	O
what	O
people	O
mean	O
and	O
records	O
the	O
results	O
,	O
which	O
adapts	O
the	O
results	O
to	O
provide	O
better	O
user	O
satisfaction	O
.	O
</s>
<s>
There	O
are	O
over	O
200	O
different	O
ranking	O
factors	O
which	O
make	O
up	O
the	O
ranking	O
algorithm	O
,	O
whose	O
exact	O
functions	O
in	O
the	B-Application
Google	I-Application
algorithm	O
are	O
not	O
fully	O
disclosed	O
.	O
</s>
<s>
Behind	O
content	O
and	O
links	O
,	O
RankBrain	B-Application
is	O
considered	O
the	O
third	O
most	O
important	O
signal	O
in	O
determining	O
ranking	O
on	O
Google	B-Application
search	O
.	O
</s>
<s>
Although	O
Google	B-Application
has	O
not	O
admitted	O
to	O
any	O
order	O
of	O
importance	O
,	O
only	O
that	O
RankBrain	B-Application
is	O
one	O
of	O
the	O
three	O
most	O
important	O
of	O
its	O
search	O
ranking	O
signals	O
.	O
</s>
<s>
When	O
offline	O
,	O
RankBrain	B-Application
is	O
given	O
batches	O
of	O
past	O
searches	O
and	O
learns	O
by	O
matching	O
search	B-Application
results	I-Application
.	O
</s>
<s>
Studies	O
showed	O
how	O
RankBrain	B-Application
better	O
interpreted	O
the	O
relationships	O
between	O
words	O
.	O
</s>
<s>
words	O
that	O
were	O
historically	O
ignored	O
previously	O
by	O
Google	B-Application
but	O
are	O
sometimes	O
of	O
a	O
major	O
importance	O
to	O
fully	O
understanding	O
the	O
meaning	O
or	O
intent	O
behind	O
a	O
person	O
’s	O
search	O
query	O
.	O
</s>
<s>
Once	O
RankBrain	B-Application
's	O
results	O
are	O
verified	O
by	O
Google	B-Application
's	I-Application
team	O
,	O
the	O
system	O
is	O
updated	O
and	O
goes	O
live	O
again	O
.	O
</s>
<s>
Google	B-Application
has	O
stated	O
that	O
it	O
uses	O
tensor	B-Device
processing	I-Device
unit	I-Device
(	O
TPU	O
)	O
ASICs	O
for	O
processing	O
RankBrain	B-Application
requests	O
.	O
</s>
<s>
RankBrain	B-Application
has	O
allowed	O
Google	B-Application
to	O
speed	O
up	O
the	O
algorithmic	O
testing	O
it	O
does	O
for	O
keyword	O
categories	O
to	O
attempt	O
to	O
choose	O
the	O
best	O
content	O
for	O
any	O
particular	O
keyword	O
search	O
.	O
</s>
<s>
This	O
means	O
that	O
old	O
methods	O
of	O
gaming	O
the	O
rankings	O
with	O
false	O
signals	O
are	O
becoming	O
less	O
and	O
less	O
effective	O
,	O
and	O
the	O
highest	O
quality	O
content	O
from	O
a	O
human	O
perspective	O
is	O
being	O
ranked	O
higher	O
in	O
Google	B-Application
.	I-Application
</s>
<s>
RankBrain	B-Application
has	O
helped	O
Hummingbird	O
provide	O
more	O
accurate	O
results	O
because	O
it	O
can	O
learn	O
words	O
and	O
phrases	O
it	O
may	O
not	O
know	O
.	O
</s>
