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List: insight-users
Subject: Re: [Insight-users] [ITK Community] Cost function value increases
From: Hana Cherif <hanacherif62 () gmail ! com>
Date: 2013-11-30 12:55:44
Message-ID: CAGJa-oavoJnVotMAs7f8QcVcH7drQrj7wPg7vNSua7ic6gEYHA () mail ! gmail ! com
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I get that my program does not take into account the header files from my
optimizer , as when I tried to modify the header file optimizer so that it
displays me an error !! when I did the compilation it works without any
error !
Would you give me some hint of that please, thanks
2013/11/28 Brian Helba <brian.helba@kitware.com>
> I would try some much larger maximum step values. You program appears to
> be spending iterations while not making very much progress at the start.
>
> Also, when you're tuning things, it can be helpful to print the moving
> image parameters on each iteration, in addition to the cost function.
> On Nov 27, 2013 5:42 PM, "Hana Cherif" <hanacherif62@gmail.com> wrote:
>
>>
>> Hello every body !
>>
>>
>> After execution of my images' registration program , using this
>> components:
>>
>> Regular Step Gradient Descent Optimizer,
>> Mean Squares Image To Image Metric
>> Bspline interpolator
>>
>> I get this results::
>>
>>
>> Iteration number: Cost function value
>>
>>
>> 0 2732.74
>> 1 2700.84
>> 2 2699.27
>> 3 2701.48
>> 4 2703.19
>> 5 2700
>> 6 2704.12
>> 7 2705.1
>> 8 2705.27
>> 9 2705.4
>> 10 2702.91
>> 11 2705.15
>> 12 2713.1
>> 13 2720.48
>> 14 2720
>> 15 2715.81
>> 16 2704.64
>> 17 2687.46
>> 18 2666.14
>> 19 2639.91
>> 20 2613.11
>> 21 2587.55
>> 22 2564.89
>> 23 2546.22
>>
>> I use this parameters:
>> optimizer->SetMaximumStepLength(0.10 );
>> optimizer->SetMinimumStepLength( 0.05);
>> optimizer->SetRelaxationFactor(0.5);
>>
>> My question is : as you see i the results the value of the cost function
>> increases i want to know why can be the reason of this results please!! is
>> it just a probleme of parameters??
>>
>> Thanks !
>>
>>
>>
>> _____________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Kitware offers ITK Training Courses, for more information visit:
>> http://www.kitware.com/products/protraining.php
>>
>> Please keep messages on-topic and check the ITK FAQ at:
>> http://www.itk.org/Wiki/ITK_FAQ
>>
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>>
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>>
>>
[Attachment #5 (text/html)]
<div dir="ltr"><span id="result_box" class="" lang="en"><span class="">I get that \
my</span> <span class="">program does not take</span> <span class="">into account \
the</span> <span class="">header</span> <span class="">files from my</span> <span \
class="">optimizer</span><span> ,</span> <span class="">as</span> <span class="">when \
I tried</span> <span class="">to modify the</span> <span class="">header</span> <span \
class="">file</span> <span class="">optimizer</span> <span class="">so that it \
displays</span> <span class="">me</span> <span class="">an</span> <span \
class="">error</span> <span class="">!! when</span> <span class="">I did the</span> \
<span class="">compilation</span> <span class="">it works</span> <span \
class="">without any error !<br> <br> Would you give me some hint of that please, \
thanks <br></span></span></div><div class="gmail_extra"><br><br><div \
class="gmail_quote">2013/11/28 Brian Helba <span dir="ltr"><<a \
href="mailto:brian.helba@kitware.com" \
target="_blank">brian.helba@kitware.com</a>></span><br> <blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><p dir="ltr">I would try some much larger maximum step \
values. You program appears to be spending iterations while not making very much \
progress at the start.</p>
<p dir="ltr">Also, when you're tuning things, it can be helpful to print the \
moving image parameters on each iteration, in addition to the cost function.</p> <div \
class="gmail_quote"><div><div class="h5">On Nov 27, 2013 5:42 PM, "Hana \
Cherif" <<a href="mailto:hanacherif62@gmail.com" \
target="_blank">hanacherif62@gmail.com</a>> wrote:<br type="attribution"></div> \
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div><div class="h5"> <div \
dir="ltr"><div><div><br></div>Hello every body !<br><br><br></div><div>After \
execution of my images' registration program , using this \
components:<br><br></div><div>Regular Step Gradient Descent Optimizer,<br>Mean \
Squares Image To Image Metric<br>
</div><div>Bspline interpolator<br><br> I get this results::<br><br><br>Iteration \
number: Cost function value <br><br><br>0 2732.74 \
<br>1 2700.84 <br>
2 2699.27 <br>3 2701.48 \
<br>4 2703.19 <br>5 2700 \
<br>6 2704.12 <br>
7 2705.1 <br>8 2705.27 \
<br>9 2705.4 <br>10 \
2702.91 <br>11 2705.15 <br>
12 2713.1 <br>13 2720.48 \
<br>14 2720 <br>15 \
2715.81 <br>16 2704.64 <br>
17 2687.46 <br>18 \
2666.14 <br>19 2639.91 <br>20 \
2613.11 <br>21 2587.55 <br>
22 2564.89 <br>23 \
2546.22 <br><br></div><div>I use this parameters:<br> \
optimizer->SetMaximumStepLength(0.10 );<br> optimizer->SetMinimumStepLength( \
0.05);<br>
optimizer->SetRelaxationFactor(0.5);<br><br></div><div>My question is : as you \
see i the results the value of the cost function increases i want to know why can be \
the reason of this results please!! is it just a probleme of parameters??<br>
<br></div><div>Thanks !<br></div><div><br></div><div><br></div></div>
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<br></blockquote></div> </blockquote></div><br></div>
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Kitware offers ITK Training Courses, for more information visit:
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