<s>
Cold	B-General_Concept
start	I-General_Concept
in	O
computing	O
refers	O
to	O
a	O
problem	O
where	O
a	O
system	O
or	O
its	O
part	O
was	O
created	O
or	O
restarted	O
and	O
is	O
not	O
working	O
at	O
its	O
normal	O
operation	O
.	O
</s>
<s>
The	O
problem	O
can	O
be	O
related	O
to	O
initialising	O
internal	O
objects	O
or	O
populating	O
cache	B-Protocol
or	O
starting	O
up	O
subsystems	O
.	O
</s>
<s>
In	O
a	O
typical	O
web	O
service	O
system	O
the	O
problem	O
occurs	O
after	O
restarting	O
the	O
server	O
,	O
and	O
also	O
when	O
clearing	O
the	O
cache	B-Protocol
(	O
e.g.	O
,	O
after	O
releasing	O
new	O
version	O
)	O
.	O
</s>
<s>
The	O
first	O
requests	O
to	O
the	O
web	O
service	O
will	O
cause	O
significantly	O
more	O
load	O
due	O
to	O
the	O
server	O
cache	B-Protocol
being	O
populated	O
,	O
the	O
browser	B-Protocol
cache	I-Protocol
being	O
cleared	O
,	O
and	O
new	O
resources	O
being	O
requested	O
.	O
</s>
<s>
Other	O
services	O
like	O
a	O
caching	B-General_Concept
proxy	O
or	O
web	B-Application
accelerator	I-Application
will	O
also	O
need	O
time	O
to	O
gather	O
new	O
resources	O
and	O
operate	O
normally	O
.	O
</s>
<s>
Similar	O
problem	O
occurs	O
when	O
creating	O
instances	O
in	O
a	O
hosted	O
environment	O
and	O
instances	O
in	O
cloud	B-Architecture
computing	I-Architecture
services	O
.	O
</s>
<s>
Cold	B-General_Concept
start	I-General_Concept
(	O
or	O
cold	O
boot	O
)	O
may	O
also	O
refer	O
to	O
a	O
booting	O
process	O
of	O
a	O
single	O
computer	O
(	O
or	O
virtual	B-Architecture
machine	I-Architecture
)	O
.	O
</s>
<s>
In	O
this	O
case	O
services	O
and	O
other	O
startup	O
applications	B-Application
are	O
executed	O
after	O
reboot	O
.	O
</s>
<s>
Another	O
type	O
of	O
problem	O
is	O
when	O
the	O
data	B-Application
model	I-Application
of	O
a	O
particular	O
system	O
requires	O
connections	O
between	O
objects	O
.	O
</s>
<s>
This	O
is	O
well	O
known	O
problem	O
with	O
recommender	B-Application
systems	I-Application
.	O
</s>
<s>
in	O
Active	O
learning	O
)	O
,	O
cold	B-General_Concept
start	I-General_Concept
refers	O
to	O
training	O
the	O
model	O
on	O
the	O
so	O
far	O
obtained	O
labeled	O
pool	O
with	O
new	O
data	O
added	O
de	O
novo	O
,	O
instead	O
of	O
training	O
the	O
model	O
on	O
new	O
data	O
with	O
all	O
its	O
knowledge	O
from	O
previous	O
trainings	O
(	O
warm	O
start	O
)	O
.	O
</s>
