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fixed bug in rat_quad for RW

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This commit is contained in:
James Hensman 2013-09-16 14:05:37 +01:00
parent d7b8352428
commit aafce736f8
1 changed files with 2 additions and 2 deletions
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4
GPy/kern/parts/rational_quadratic.py
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@ -57,7 +57,7 @@ class RationalQuadratic(Kernpart):
dist2 = np.square((X-X2.T)/self.lengthscale)
dvar = (1 + dist2/2.)**(-self.power)
dl = self.power * self.variance * dist2 * self.lengthscale**(-3) * (1 + dist2/2./self.power)**(-self.power-1)
dl = self.power * self.variance * dist2 / self.lengthscale * (1 + dist2/2.)**(-self.power-1)
dp = - self.variance * np.log(1 + dist2/2.) * (1 + dist2/2.)**(-self.power)
target[0] += np.sum(dvar*dL_dK)
@ -70,7 +70,7 @@ class RationalQuadratic(Kernpart):
def dK_dX(self,dL_dK,X,X2,target):
"""derivative of the covariance matrix with respect to X."""
if X2 is None:
if X2 is None:
dist2 = np.square((X-X.T)/self.lengthscale)
dX = -2.*self.variance*self.power * (X-X.T)/self.lengthscale**2 * (1 + dist2/2./self.lengthscale)**(-self.power-1)
else: