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Hello,
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<div class="">You also need to graft the input and output so that updates and propagation of the mini-pipeline does not propagate beyond the mini-pipeline[1] [2].</div>
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<div class="">Your approach sounds about right. But there are a lot of stumbling block with this approach and just a couple ways to do everything “proper”. Also this goal of “caching” the internal data, is not what is generally done in ITK. Most filters in
ITK, prefer to release the data and keep memory usage to a minimum. It frequently turns out, that keeping a pipeline’s memory foot print small is important to fast execution and allows the processing to scale to larger data sets too.</div>
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<div class="">The “ReleaseData” flag does not cause the pipeline to be re-executed. You will have to examine the pipeline code and the time stamps of the relevant objects to determine the effect of “manual” releasing the data, and how to best do it for your
situation.</div>
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<div class="">HTH,</div>
<div class="">Brad</div>
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</div>
<div class="">[1] <a href="https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/Filtering/ImageFeature/include/itkUnsharpMaskImageFilter.hxx#L78-L79" class="">https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/Filtering/ImageFeature/include/itkUnsharpMaskImageFilter.hxx#L78-L79</a></div>
<div class="">[2] <a href="https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/Filtering/ImageFeature/include/itkUnsharpMaskImageFilter.hxx#L100-L102" class="">https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/Filtering/ImageFeature/include/itkUnsharpMaskImageFilter.hxx#L100-L102</a></div>
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<div class="">On Apr 25, 2017, at 11:55 AM, asertyuio via Insight-users <<a href="mailto:insight-users@itk.org" class="">insight-users@itk.org</a>> wrote:</div>
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<p style="margin: 0px 0px 1.2em ! important;" class="">Thanks for your answer Brad !</p>
<p style="margin: 0px 0px 1.2em ! important;" class="">Just to confirm that I understood well:</p>
<p style="margin: 0px 0px 1.2em ! important;" class="">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;" class="">
<li style="margin: 0.5em 0px;" class="">
<div style="margin: 0.5em 0px !important;" class="">use the H, R, RS, W, WS, M filters as members</div>
</li><li style="margin: 0.5em 0px;" class="">
<div style="margin: 0.5em 0px !important;" class="">set up their relationships in the filter constructor</div>
</li><li style="margin: 0.5em 0px;" class="">
<div style="margin: 0.5em 0px !important;" class="">do the update at the M filter</div>
</li></ul>
<p style="margin: 0px 0px 1.2em ! important;" class="">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;" class="">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;" class="">Ok, after rereading what the software guide tells about that:
</p>
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rgb(221, 221, 221); padding: 0px 1em; color: rgb(119, 119, 119);
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<p style="margin: 0px 0px 1.2em ! important;" class="">Filter execution occurs<br class="">
when a) the filter is modified as a result of modifying an instance variable; b) the input to the filter<br class="">
changes; c) the input data has been released<br class="">
— <cite class="">ITK Software guide p. 200 </cite></p>
</blockquote>
<p style="margin: 0px 0px 1.2em ! important;" class="">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;" class="">If I want the filter to have the expected behavior, Is it possible to trigger the update manually ?<br class="">
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;" class="">Yann</p>
<p style="margin: 0px 0px 1.2em ! important;" class="">Le 24/04/2017 à 17:35, Lowekamp, Bradley (NIH/NLM/LHC) [C] a écrit :</p>
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<blockquote cite="mid:41F1BDD4-8A68-4998-A1C7-5A3B2DF9D544@mail.nih.gov" type="cite" class="">
Hello,
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</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>
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</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>
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</div>
<div class="">HTH,</div>
<div class="">Brad</div>
<div class=""><br class="">
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<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>
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<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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