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class="markdown-here-wrapper" data-md-url="Thunderbird">
<p style="margin: 0px 0px 1.2em ! important;">Thanks for your
answer Brad !</p>
<p style="margin: 0px 0px 1.2em ! important;">Just to confirm that
I understood well:</p>
<p style="margin: 0px 0px 1.2em ! important;">To unsure that only
the needed parts are actualized I call the global update, I need
to:</p>
<ul style="margin: 1.2em 0px;padding-left: 2em;">
<li style="margin: 0.5em 0px;">
<p style="margin: 0px 0px 1.2em ! important;margin: 0.5em 0px
! important;">use the H, R, RS, W, WS, M filters as members</p>
</li>
<li style="margin: 0.5em 0px;">
<p style="margin: 0px 0px 1.2em ! important;margin: 0.5em 0px
! important;">set up their relationships in the filter
constructor</p>
</li>
<li style="margin: 0.5em 0px;">
<p style="margin: 0px 0px 1.2em ! important;margin: 0.5em 0px
! important;">do the update at the M filter</p>
</li>
</ul>
<p style="margin: 0px 0px 1.2em ! important;">Then I can call
manually releaseData on the R and W filter after the call to M
update().</p>
<p style="margin: 0px 0px 1.2em ! important;">And that should do
the trick, and release data should not make the downstream
filters RS and WS to update, right ?</p>
<p style="margin: 0px 0px 1.2em ! important;">Ok, after rereading
what the software guide tells about that: </p>
<blockquote style="margin: 1.2em 0px;border-left: 4px solid
rgb(221, 221, 221); padding: 0px 1em; color: rgb(119, 119, 119);
quotes: none;">
<p style="margin: 0px 0px 1.2em ! important;">Filter execution
occurs<br>
when a) the filter is modified as a result of modifying an
instance variable; b) the input to the filter<br>
changes; c) the input data has been released<br>
— <cite>ITK Software guide p. 200 </cite> </p>
</blockquote>
<p style="margin: 0px 0px 1.2em ! important;">So it seems like if
I release the data of W or R, updating M will force WS and RS to
update… Am I wrong ?</p>
<p style="margin: 0px 0px 1.2em ! important;">If I want the filter
to have the expected behavior, Is it possible to trigger the
update manually ?<br>
I’m thinking of disconnecting RS and WS by using new smart
pointers for R and W output, checking manually the modified
state to conditionally call update when relevant.</p>
<p style="margin: 0px 0px 1.2em ! important;">Yann</p>
<p style="margin: 0px 0px 1.2em ! important;">Le 24/04/2017 à
17:35, Lowekamp, Bradley (NIH/NLM/LHC) [C] a écrit :</p>
<p style="margin: 0px 0px 1.2em ! important;"></p>
<div class="markdown-here-exclude">
<p></p>
<blockquote
cite="mid:41F1BDD4-8A68-4998-A1C7-5A3B2DF9D544@mail.nih.gov"
type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=utf-8">
Hello,
<div class=""><br class="">
</div>
<div class="">To the best of my knowledge and experience with
the ITK pipeline, when the output of a filter ( H or R ) is
used as multiple inputs with the ReleaseData, the data from
the output ( H or R ) will be release after _each_ filter
which use that output data. So the result is that the
minimal amount of memory is consumed! But in a complex
pipeline like yours filters will be executed multiple times
for a single update.</div>
<div class=""><br class="">
</div>
<div class="">Based on your comments you likely want to set
only R and W to ReleaseData automatically. This ensures that
all the inputs to M are cached and available. The trade off
is that R will get execute twice. Alternatively, you could
just manually release the output of R after execution.</div>
<div class=""><br class="">
</div>
<div class="">HTH,</div>
<div class="">Brad</div>
<div class=""><br class="">
<div>
<blockquote type="cite" class="">
<div class="">On Apr 22, 2017, at 12:46 PM, asertyuio
via Insight-users <<a moz-do-not-send="true"
href="mailto:insight-users@itk.org" class="">insight-users@itk.org</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div text="#000000" bgcolor="#FFFFFF" class="">
<div markdown-here-wrapper-content-modified="true"
style="" class="markdown-here-wrapper"
data-md-url="Thunderbird">
<p style="margin: 0px 0px 1.2em ! important;"
class="">Dear Users,</p>
<p style="margin: 0px 0px 1.2em ! important;"
class="">I have trouble applying the concepts
behind the release data flag, and memory
management of itk to a particular problem.</p>
<p style="margin: 0px 0px 1.2em ! important;"
class="">I’m developing a filter with, for part
of it, it a rather complex mini pipeline.<br
class="">
H, R, RS, W, WS and M are itk filters.<br
class="">
The filter will be updated frequently, and I’m
trying to make the update only update necessary
parts, while keeping memory imprinting as low as
possible.</p>
<p style="margin: 0px 0px 1.2em ! important;"
class="">Here is a schematic, simplified graph
representing my filter :</p>
<pre style="font-size: 0.85em; font-family: Consolas,Inconsolata,Courier,monospace;font-size: 1em; line-height: 1.2em;margin: 1.2em 0px;" class=""><code style="font-size: 0.85em; font-family: Consolas,Inconsolata,Courier,monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;white-space: pre; overflow: auto; border-radius: 3px; border: 1px solid rgb(204, 204, 204); padding: 0.5em 0.7em; display: block ! important;" class=""> H
| \
v \
R \ -> take as input a parameter P1 that do not change often
| \
/ \ /\
v v v |
RS W |
| | |
| v |
\ WS |
\ | /
v v v
M -> takes parameters P2 that are often updated
</code></pre>
<p style="margin: 0px 0px 1.2em ! important;"
class="">I would like to be able to release the
output data of the filter R and of the filter W,
updating them only if the parameter P1 change
(which would trigger update for the whole
pipeline), while still being able to change P2
without having to recalculate R, W and RS.</p>
<p style="margin: 0px 0px 1.2em ! important;"
class="">I think it may be possible with the
releaseData flag, don’t really understand where
it should be putted, and if this will do what I
need.</p>
<p style="margin: 0px 0px 1.2em ! important;"
class="">Thanks a lot for you help !<br class="">
Yann</p>
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