<s>
Leela	B-Application
Zero	I-Application
is	O
a	O
free	B-License
and	I-License
open-source	I-License
computer	B-Application
Go	I-Application
program	O
released	O
on	O
25	O
October	O
2017	O
.	O
</s>
<s>
It	O
is	O
developed	O
by	O
Belgian	O
programmer	O
Gian-Carlo	O
Pascutto	O
,	O
the	O
author	O
of	O
chess	O
engine	O
Sjeng	B-Application
and	O
Go	O
engine	O
Leela	B-Application
.	O
</s>
<s>
Leela	B-Application
Zero	I-Application
's	O
algorithm	O
is	O
based	O
on	O
DeepMind	B-Application
's	O
2017	O
paper	O
about	O
AlphaGo	B-Application
Zero	I-Application
.	O
</s>
<s>
Unlike	O
the	O
original	O
Leela	B-Application
,	O
which	O
has	O
a	O
lot	O
of	O
human	O
knowledge	O
and	O
heuristics	O
programmed	O
into	O
it	O
,	O
the	O
program	O
code	O
in	O
Leela	B-Application
Zero	I-Application
only	O
knows	O
the	O
basic	O
rules	O
and	O
nothing	O
more	O
.	O
</s>
<s>
The	O
knowledge	O
that	O
makes	O
Leela	B-Application
Zero	I-Application
a	O
strong	O
player	O
is	O
contained	O
in	O
a	O
neural	B-Architecture
network	I-Architecture
,	O
which	O
is	O
trained	O
based	O
on	O
the	O
results	O
of	O
previous	O
games	O
that	O
the	O
program	O
played	O
.	O
</s>
<s>
Leela	B-Application
Zero	I-Application
is	O
trained	O
by	O
a	O
distributed	O
effort	O
,	O
which	O
is	O
coordinated	O
at	O
the	O
Leela	B-Application
Zero	I-Application
website	O
.	O
</s>
<s>
Members	O
of	O
the	O
community	O
provide	O
computing	O
resources	O
by	O
running	O
the	O
client	O
,	O
which	O
generates	O
self-play	B-Algorithm
games	O
and	O
submits	O
them	O
to	O
the	O
server	O
.	O
</s>
<s>
The	O
self-play	B-Algorithm
games	O
are	O
used	O
to	O
train	O
newer	O
networks	O
.	O
</s>
<s>
Leela	B-Application
Zero	I-Application
finished	O
third	O
at	O
the	O
BerryGenomics	O
Cup	O
World	O
AI	O
Go	O
Tournament	O
in	O
Fuzhou	O
,	O
Fujian	O
,	O
China	O
on	O
28	O
April	O
2018	O
.	O
</s>
<s>
The	O
New	O
Yorker	O
at	O
the	O
end	O
of	O
2018	O
characterized	O
Leela	B-Application
and	O
Leela	B-Application
Zero	I-Application
as	O
"	O
the	O
world	O
’s	O
most	O
successful	O
open-source	O
Go	O
engines	O
"	O
.	O
</s>
<s>
In	O
early	O
2018	O
,	O
another	O
team	O
branched	O
Leela	B-Application
Chess	I-Application
Zero	I-Application
from	O
the	O
same	O
code	O
base	O
,	O
also	O
to	O
verify	O
the	O
methods	O
in	O
the	O
AlphaZero	B-Application
paper	O
as	O
applied	O
to	O
the	O
game	O
of	O
chess	O
.	O
</s>
<s>
AlphaZero	B-Application
's	O
use	O
of	O
Google	O
TPUs	O
was	O
replaced	O
by	O
a	O
crowd-sourcing	O
infrastructure	O
and	O
the	O
ability	O
to	O
use	O
graphics	O
card	O
GPUs	O
via	O
the	O
OpenCL	O
library	O
.	O
</s>
<s>
Even	O
so	O
,	O
it	O
is	O
expected	O
to	O
take	O
a	O
year	O
of	O
crowd-sourced	O
training	O
to	O
make	O
up	O
for	O
the	O
dozen	O
hours	O
that	O
AlphaZero	B-Application
was	O
allowed	O
to	O
train	O
for	O
its	O
chess	O
match	O
in	O
the	O
paper	O
.	O
</s>
