Sigmoid (hyperbolic tangent) kernel
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Sigmoid (hyperbolic tangent) kernel.
See http://crsouza.com/2010/03/kernel-functions-for-machine-learning-applications/#sigmoid
npm i ml-kernel-sigmoid
Options:
- alpha - value for the alpha factor (default: 0.01)
- constant - value for the constant (default: -Math.E)
Returns the dot product between x and y in feature space.
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