<div>Hi Luis,</div>
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<div>Actually my original question was quite simple. I didn't intend to compare A with B to decide which one is better. What concerned me is why when I used itkRegularStepGradientDescentOptimizer the metric values first decreased and then increased (isn't this abnormal?). While using LBFGSBOptimizer the metric values kept decreasing and stopped when the optimizer thought it reached mimimum. Unless I missed something, I haven't understood why.
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<div>Cheers,</div>
<div>Ming</div>
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