Can you try your model again with -1/2 written either as -0.5 or -1/2.0?
The line (-1/2)*log1p(p.^2) is rounding to 0.
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Can you try your model again with -1/2 written either as -0.5 or -1/2.0?
The line (-1/2)*log1p(p.^2) is rounding to 0.