[ITK-users] releaseData flag, partial update in a complex pipeline

[Lowekamp, Bradley (NIH/NLM/LHC) [C]]

Hello,

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.

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.

HTH,
Brad

On Apr 22, 2017, at 12:46 PM, asertyuio via Insight-users <insight-users at itk.org<mailto:insight-users at itk.org>> wrote:


Dear Users,

I have trouble applying the concepts behind the release data flag, and memory management  of itk to a particular problem.

I’m developing a filter with, for part of it, it a rather complex mini pipeline.
H, R, RS, W, WS and M are itk filters.
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.

Here is a schematic, simplified graph representing my filter :

    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


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.

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.

Thanks a lot for you help !
Yann

​
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