[Insight-users] OnePlusOneOptimizer ... generator

[Zachary Pincus]

The OnePlusOneEvolutionaryOptimizer samples the search space randomly, 
within a search radius that is initially defined by the "initial search 
radius" parameter.

These random samples are generated by drawing normally-distributed 
values pseudo-random number generator. Because computers are 
deterministic, for any given seed (the value passed to "Initialize"), 
the sequence of random numbers from the generator is always the same; 
however within that sequence they are approximately random.

So, changing the value passed to "Initialize" changes the random number 
stream used to generate samples for the Optimizer. That is, given a 
different seed, the Optimizer will pursue a different trajectory 
through the search space. However, the results should basically be the 
same for any given seed. Moreover, there is no way to predict how a 
specific seed will influence the results.

Zach


On Apr 13, 2005, at 8:25 AM, Xavier Kite wrote:

> Hi,
>
> I would want to know if the choice of the generator has an effect on 
> the result.
> In the example ImageRegistration11, the choice was 
> generator->Initialize( 12345 ).
> If we change the 12345, which possibilities do we have? And what will 
> be the result of this change?
>
> Thanks.
>
>      Xavier
>
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