Adapt likelihoods init to check for sympy.

GPy/core/parameterization/param.py

@@ -4,7 +4,7 @@
 import itertools
 import numpy
 from parameter_core import OptimizationHandlable, adjust_name_for_printing
-from array_core import ObsAr
+from observable_array import ObsAr
 
 ###### printing
 __constraints_name__ = "Constraint"

GPy/likelihoods/__init__.py

@@ -4,11 +4,19 @@ from gaussian import Gaussian
 from gamma import Gamma
 from poisson import Poisson
 from student_t import StudentT
-from sstudent_t import SstudentT
 from likelihood import Likelihood
 from mixed_noise import MixedNoise
-from symbolic import Symbolic
+# TODO need to fix this in a config file.
-from negative_binomial import Negative_binomial
+try:
-from skew_normal import Skew_normal
+    import sympy as sym
-from skew_exponential import Skew_exponential
+    sympy_available=True
-from null_category import Null_category
+except ImportError:
+    sympy_available=False
+if sympy_available:
+    # These are likelihoods that rely on symbolic.
+    from symbolic import Symbolic
+    from sstudent_t import SstudentT
+    from negative_binomial import Negative_binomial
+    from skew_normal import Skew_normal
+    from skew_exponential import Skew_exponential
+    from null_category import Null_category

GPy/testing/parameterized_tests.py

@@ -7,7 +7,7 @@ import unittest
 import GPy
 import numpy as np
 from GPy.core.parameterization.parameter_core import HierarchyError
-from GPy.core.parameterization.array_core import ObsAr
+from GPy.core.parameterization.observable_array import ObsAr
 
 class ArrayCoreTest(unittest.TestCase):
     def setUp(self):

GPy/testing/pickle_tests.py

@@ -10,7 +10,7 @@ from GPy.core.parameterization.index_operations import ParameterIndexOperations,
     ParameterIndexOperationsView
 import tempfile
 from GPy.core.parameterization.param import Param
-from GPy.core.parameterization.array_core import ObsAr
+from GPy.core.parameterization.observable_array import ObsAr
 from GPy.core.parameterization.priors import Gaussian
 from GPy.kern._src.rbf import RBF
 from GPy.kern._src.linear import Linear