<s>
An	O
adaptive	B-Algorithm
algorithm	I-Algorithm
is	O
an	O
algorithm	O
that	O
changes	O
its	O
behavior	O
at	O
the	O
time	O
it	O
is	O
run	O
,	O
based	O
on	O
information	O
available	O
and	O
on	O
a	O
priori	O
defined	O
reward	O
mechanism	O
(	O
or	O
criterion	O
)	O
.	O
</s>
<s>
Among	O
the	O
most	O
used	O
adaptive	B-Algorithm
algorithms	I-Algorithm
is	O
the	O
Widrow-Hoff	O
’	O
s	O
least	O
mean	O
squares	O
(	O
LMS	O
)	O
,	O
which	O
represents	O
a	O
class	O
of	O
stochastic	O
gradient-descent	O
algorithms	O
used	O
in	O
adaptive	O
filtering	O
and	O
machine	O
learning	O
.	O
</s>
<s>
As	O
implemented	O
by	O
the	O
C++	B-Language
Standard	I-Language
Library	I-Language
,	O
is	O
adaptive	O
and	O
so	O
it	O
acquires	O
as	O
much	O
memory	O
as	O
it	O
can	O
get	O
(	O
up	O
to	O
what	O
it	O
would	O
need	O
at	O
most	O
)	O
and	O
applies	O
the	O
algorithm	O
using	O
that	O
available	O
memory	O
.	O
</s>
<s>
Another	O
example	O
is	O
adaptive	B-Algorithm
sort	I-Algorithm
,	O
whose	O
behavior	O
changes	O
upon	O
the	O
presortedness	O
of	O
its	O
input	O
.	O
</s>
<s>
An	O
example	O
of	O
an	O
adaptive	B-Algorithm
algorithm	I-Algorithm
in	O
radar	B-Application
systems	I-Application
is	O
the	O
constant	B-Algorithm
false	I-Algorithm
alarm	I-Algorithm
rate	I-Algorithm
(	O
CFAR	O
)	O
detector	O
.	O
</s>
<s>
Examples	O
include	O
adaptive	B-Algorithm
simulated	I-Algorithm
annealing	I-Algorithm
,	O
adaptive	B-Algorithm
coordinate	I-Algorithm
descent	I-Algorithm
,	O
adaptive	B-Algorithm
quadrature	I-Algorithm
,	O
AdaBoost	B-Algorithm
,	O
Adagrad	O
,	O
Adadelta	O
,	O
RMSprop	O
,	O
and	O
Adam	O
.	O
</s>
<s>
In	O
data	B-General_Concept
compression	I-General_Concept
,	O
adaptive	B-Algorithm
coding	I-Algorithm
algorithms	O
such	O
as	O
Adaptive	B-Algorithm
Huffman	I-Algorithm
coding	I-Algorithm
or	O
Prediction	B-Algorithm
by	I-Algorithm
partial	I-Algorithm
matching	I-Algorithm
can	O
take	O
a	O
stream	O
of	O
data	O
as	O
input	O
,	O
and	O
adapt	O
their	O
compression	O
technique	O
based	O
on	O
the	O
symbols	O
that	O
they	O
have	O
already	O
encountered	O
.	O
</s>
