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making clipping adjustable

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Max Zwiessele 2013-05-10 17:32:26 +01:00
parent f6ffbf88d9
commit c97359c7af
1 changed files with 4 additions and 3 deletions
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7
GPy/core/transformations.py
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@ -39,8 +39,9 @@ class logexp(transformation):
return '(+ve)' return '(+ve)'
class logexp_clipped(transformation): class logexp_clipped(transformation):
def __init__(self): def __init__(self, lower=1e-12):
self.domain = 'positive' self.domain = 'positive'
self.lower = lower
def f(self, x): def f(self, x):
f = np.log(1. + np.exp(x)) f = np.log(1. + np.exp(x))
return f return f
@ -49,13 +50,13 @@ class logexp_clipped(transformation):
def gradfactor(self, f): def gradfactor(self, f):
ef = np.exp(f) ef = np.exp(f)
gf = (ef - 1.) / ef gf = (ef - 1.) / ef
return np.where(f < 1e-6, 0, gf) return np.where(f < self.lower, 0, gf)
def initialize(self,f): def initialize(self,f):
if np.any(f<0.): if np.any(f<0.):
print "Warning: changing parameters to satisfy constraints" print "Warning: changing parameters to satisfy constraints"
return np.abs(f) return np.abs(f)
def __str__(self): def __str__(self):
return '(+ve)' return '(+ve_c)'
class exponent(transformation): class exponent(transformation):
def __init__(self): def __init__(self):