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added an exception when you input 0 or negative values to logtanh function

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beckdaniel 2016-03-14 17:40:43 +00:00
parent 0d943ac98e
commit 347bcc963a
1 changed files with 9 additions and 1 deletions
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8
GPy/util/warping_functions.py
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@ -4,6 +4,7 @@
import numpy as np import numpy as np
from ..core.parameterization import Parameterized, Param from ..core.parameterization import Parameterized, Param
from paramz.transformations import Logexp from paramz.transformations import Logexp
import sys
class WarpingFunction(Parameterized): class WarpingFunction(Parameterized):
@ -45,7 +46,11 @@ class WarpingFunction(Parameterized):
it = 0 it = 0
update = np.inf update = np.inf
while np.abs(update).sum() > 1e-10 and it < max_iterations: while np.abs(update).sum() > 1e-10 and it < max_iterations:
try:
fy = self.f(y) fy = self.f(y)
except ValueError:
sys.stderr.write("One of y's is negative! Stopping inverse calculation.\n")
break
fgrady = self.fgrad_y(y) fgrady = self.fgrad_y(y)
update = (fy - z) / fgrady update = (fy - z) / fgrady
y -= self.rate * update y -= self.rate * update
@ -204,6 +209,9 @@ class LogTanhFunction(WarpingFunction):
:math:`f = (y * d) + \\sum_{terms} a * tanh(b *(y + c))` :math:`f = (y * d) + \\sum_{terms} a * tanh(b *(y + c))`
""" """
if (y <= 0.0).any():
sys.stderr.write("Negative y found!, raising exception.\n")
raise ValueError
d = self.d d = self.d
mpsi = self.psi mpsi = self.psi
z = d * np.log(y) z = d * np.log(y)