<s>
Brain.js	B-Language
is	O
a	O
JavaScript	B-Language
library	I-Language
used	O
for	O
neural	B-Architecture
networking	I-Architecture
,	O
which	O
is	O
released	O
as	O
free	B-License
and	I-License
open-source	I-License
software	I-License
under	O
the	B-License
MIT	I-License
License	I-License
.	O
</s>
<s>
It	O
can	O
be	O
used	O
in	O
both	O
the	O
browser	B-Application
and	O
Node.js	B-Language
backends	O
.	O
</s>
<s>
Brain.js	B-Language
is	O
most	O
commonly	O
used	O
as	O
a	O
simple	O
introduction	O
to	O
neural	B-Architecture
networking	I-Architecture
,	O
as	O
it	O
hides	O
complex	O
mathematics	O
and	O
has	O
a	O
familiar	O
modern	O
JavaScript	B-Language
syntax	O
.	O
</s>
<s>
It	O
is	O
maintained	O
by	O
members	O
of	O
the	O
Brain.js	B-Language
organization	O
and	O
open-source	O
contributors	O
.	O
</s>
<s>
Creating	O
a	O
feedforward	B-Algorithm
neural	I-Algorithm
network	I-Algorithm
with	O
backpropagation	B-Algorithm
:	O
</s>
<s>
Creating	O
a	O
recurrent	B-Algorithm
neural	I-Algorithm
network	I-Algorithm
:	O
</s>
<s>
Train	O
the	O
neural	B-Architecture
network	I-Architecture
on	O
RGB	O
color	O
contrast	O
:	O
</s>
