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Fixed symmetry in checkgrad issue

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James Hensman 2013-11-27 14:57:57 +00:00
parent 557d4ea7ea
commit 0c3747dc4d
1 changed files with 6 additions and 1 deletions
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7
GPy/core/model.py
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@ -453,7 +453,12 @@ class Model(Parameterized):
if not verbose: if not verbose:
# just check the global ratio # just check the global ratio
dx = step * np.sign(np.random.uniform(-1, 1, x.size))
#choose a random direction to find the linear approximation in
if x.size==2:
dx = step * np.ones(2) # random direction for 2 parameters can fail dure to symmetry
else:
dx = step * np.sign(np.random.uniform(-1, 1, x.size))
# evaulate around the point x # evaulate around the point x
f1, g1 = self.objective_and_gradients(x + dx) f1, g1 = self.objective_and_gradients(x + dx)