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minor modifications to the constraint behaviour

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James Hensman 2013-05-10 16:39:20 +01:00
parent e60eb4e236
commit a91501af56
1 changed files with 9 additions and 1 deletions
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10
GPy/core/transformations.py
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@ -34,6 +34,8 @@ class logexp(transformation):
ef = np.exp(f) ef = np.exp(f)
return (ef - 1.)/ef return (ef - 1.)/ef
def initialize(self,f): def initialize(self,f):
if np.any(f<0.):
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)'
@ -48,6 +50,8 @@ class exponent(transformation):
def gradfactor(self,f): def gradfactor(self,f):
return f return f
def initialize(self,f): def initialize(self,f):
if np.any(f<0.):
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)'
@ -62,6 +66,8 @@ class negative_exponent(transformation):
def gradfactor(self,f): def gradfactor(self,f):
return f return f
def initialize(self,f): def initialize(self,f):
if np.any(f>0.):
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)'
@ -79,7 +85,9 @@ class logistic(transformation):
def gradfactor(self,f): def gradfactor(self,f):
return (f-self.lower)*(self.upper-f)/self.difference return (f-self.lower)*(self.upper-f)/self.difference
def initialize(self,f): def initialize(self,f):
return self.f(f*0.) if np.any(np.logical_or(f<self.lower,f>self.upper)):
print "Warning: changing parameters to satisfy constraints"
return np.where(np.logical_or(f<self.lower,f>self.upper),self.f(f*0.),f)
def __str__(self): def __str__(self):
return '({},{})'.format(self.lower,self.upper) return '({},{})'.format(self.lower,self.upper)