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removed Logsumexp() from LogisticBasisFuncKernel, allowing slope parameter to be negative. Also removed unnecessary scipy import

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Bill 2016-08-23 11:19:27 -05:00
parent aa1da6f6a1
commit 5cb22090ba
1 changed files with 2 additions and 3 deletions
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5
GPy/kern/src/basis_funcs.py
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@ -142,15 +142,14 @@ class LogisticBasisFuncKernel(BasisFuncKernel):
self.centers = np.atleast_2d(centers) self.centers = np.atleast_2d(centers)
self.ARD_slope = ARD_slope self.ARD_slope = ARD_slope
if self.ARD_slope: if self.ARD_slope:
self.slope = Param('slope', slope * np.ones(self.centers.size), Logexp()) self.slope = Param('slope', slope * np.ones(self.centers.size))
else: else:
self.slope = Param('slope', slope, Logexp()) self.slope = Param('slope', slope)
super(LogisticBasisFuncKernel, self).__init__(input_dim, variance, active_dims, ARD, name) super(LogisticBasisFuncKernel, self).__init__(input_dim, variance, active_dims, ARD, name)
self.link_parameter(self.slope) self.link_parameter(self.slope)
@Cache_this(limit=3, ignore_args=()) @Cache_this(limit=3, ignore_args=())
def _phi(self, X): def _phi(self, X):
import scipy as sp
phi = 1/(1+np.exp(-((X-self.centers)*self.slope))) phi = 1/(1+np.exp(-((X-self.centers)*self.slope)))
return np.where(np.isnan(phi), 0, phi)#((phi-self.start)/(self.stop-self.start))-.5 return np.where(np.isnan(phi), 0, phi)#((phi-self.start)/(self.stop-self.start))-.5