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ratquad working

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James Hensman 2014-02-24 09:55:16 +00:00
parent 6d2e462b5e
commit 88c080eece
3 changed files with 16 additions and 88 deletions
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12
GPy/kern/_src/stationary.py
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@ -206,9 +206,19 @@ class ExpQuad(Stationary):
return -dist*self.K(X, X2)
class RatQuad(Stationary):
"""
Rational Quadratic Kernel
.. math::
k(r) = \sigma^2 \\bigg( 1 + \\frac{r^2}{2} \\bigg)^{- \\alpha}
"""
def __init__(self, input_dim, variance=1., lengthscale=None, power=2., ARD=False, name='ExpQuad'):
super(RatQuad, self).__init__(input_dim, variance, lengthscale, ARD, name)
self.power = Param('power', power, Logexp)
self.power = Param('power', power, Logexp())
self.add_parameters(self.power)
def K(self, X, X2=None):