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only compare Z cache once

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Max Zwiessele 2013-09-03 10:05:42 +01:00
parent 58fbc70a38
commit 1d37b31bea
1 changed files with 3 additions and 2 deletions
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5
GPy/kern/parts/rbf.py
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@ -239,13 +239,14 @@ class RBF(Kernpart):
def _psi_computations(self, Z, mu, S):
# here are the "statistics" for psi1 and psi2
if not fast_array_equal(Z, self._Z):
Z_changed = not fast_array_equal(Z, self._Z)
if Z_changed:
# Z has changed, compute Z specific stuff
self._psi2_Zhat = 0.5 * (Z[:, None, :] + Z[None, :, :]) # M,M,Q
self._psi2_Zdist = 0.5 * (Z[:, None, :] - Z[None, :, :]) # M,M,Q
self._psi2_Zdist_sq = np.square(self._psi2_Zdist / self.lengthscale) # M,M,Q
if not fast_array_equal(Z, self._Z) or not fast_array_equal(mu, self._mu) or not fast_array_equal(S, self._S):
if Z_changed or not fast_array_equal(mu, self._mu) or not fast_array_equal(S, self._S):
# something's changed. recompute EVERYTHING
# psi1