Fix RBF kernel length scale calculation #2665
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This commit fixes the implementation of the RBF kernel function to correctly match the standard mathematical definition. Previously, the length scale parameter ls was used without squaring, resulting in a kernel formula of exp(- (1/(2*ls)) * ||x1 - x2||^2 ). The corrected implementation now uses ls**2 in the denominator, so the kernel is computed as exp(- (1/(2*ls**2)) * ||x1 - x2||^2 ), which is consistent with the conventional RBF kernel definition.
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This commit fixes the implementation of the RBF kernel function to correctly match the standard mathematical definition. Previously, the length scale parameter ls was used without squaring, resulting in a kernel formula of exp(- (1/(2ls)) * ||x1 - x2||^2 ). The corrected implementation now uses ls**2 in the denominator, so the kernel is computed as exp(- (1/(2ls**2)) * ||x1 - x2||^2 ), which is consistent with the conventional RBF kernel definition.
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