<s>
Autoassociative	B-Algorithm
memory	I-Algorithm
,	O
also	O
known	O
as	O
auto-association	O
memory	O
or	O
an	O
autoassociation	O
network	O
,	O
is	O
any	O
type	O
of	O
memory	O
that	O
is	O
able	O
to	O
retrieve	O
a	O
piece	O
of	O
data	O
from	O
only	O
a	O
tiny	O
sample	O
of	O
itself	O
.	O
</s>
<s>
In	O
reference	O
to	O
computer	O
memory	O
,	O
the	O
idea	O
of	O
associative	O
memory	O
is	O
also	O
referred	O
to	O
as	O
Content-addressable	B-Data_Structure
memory	I-Data_Structure
(	O
CAM	B-Data_Structure
)	O
.	O
</s>
<s>
Autoassociative	B-Algorithm
memories	I-Algorithm
are	O
capable	O
of	O
retrieving	O
a	O
piece	O
of	O
data	O
upon	O
presentation	O
of	O
only	O
partial	O
information	O
from	O
that	O
piece	O
of	O
data	O
.	O
</s>
<s>
Hopfield	B-Algorithm
networks	I-Algorithm
have	O
been	O
shown	O
to	O
act	O
as	O
autoassociative	B-Algorithm
memory	I-Algorithm
since	O
they	O
are	O
capable	O
of	O
remembering	O
data	O
by	O
observing	O
a	O
portion	O
of	O
that	O
data	O
.	O
</s>
<s>
They	O
are	O
of	O
3	O
further	O
kinds	O
—	O
Recurrent	O
linear	O
auto-associator	O
,	O
Brain-State-in-a-Box	O
net	O
,	O
and	O
Discrete	B-Algorithm
Hopfield	I-Algorithm
net	I-Algorithm
.	O
</s>
<s>
The	O
Hopfield	B-Algorithm
Network	I-Algorithm
is	O
the	O
most	O
well	O
known	O
example	O
of	O
an	O
autoassociative	B-Algorithm
memory	I-Algorithm
.	O
</s>
<s>
Hopfield	B-Algorithm
networks	I-Algorithm
serve	O
as	O
content-addressable	O
(	O
"	O
associative	O
"	O
)	O
memory	O
systems	O
with	O
binary	O
threshold	O
nodes	B-Algorithm
,	O
and	O
they	O
have	O
been	O
shown	O
to	O
act	O
as	O
autoassociative	O
since	O
they	O
are	O
capable	O
of	O
remembering	O
data	O
by	O
observing	O
a	O
portion	O
of	O
that	O
data	O
.	O
</s>
<s>
Bidirectional	B-Algorithm
associative	I-Algorithm
memories	I-Algorithm
(	O
BAM	O
)	O
are	O
artificial	B-Architecture
neural	I-Architecture
networks	I-Architecture
that	O
have	O
long	O
been	O
used	O
for	O
performing	O
heteroassociative	O
recall	O
.	O
</s>
