from functools import reduce for Py3 compat

GPy/kern/_src/add.py

@@ -5,6 +5,7 @@ import numpy as np
 import itertools
 from ...util.caching import Cache_this
 from .kern import CombinationKernel
+from functools import reduce
 
 class Add(CombinationKernel):
     """

GPy/kern/_src/kern.py

@@ -7,6 +7,7 @@ from ...core.parameterization.parameterized import Parameterized
 from .kernel_slice_operations import KernCallsViaSlicerMeta
 from ...util.caching import Cache_this
 from GPy.core.parameterization.observable_array import ObsAr
+from functools import reduce
 
 
 

GPy/testing/parameterized_tests.py

@@ -12,6 +12,7 @@ from GPy.core.parameterization.transformations import NegativeLogexp, Logistic
 from GPy.core.parameterization.parameterized import Parameterized
 from GPy.core.parameterization.param import Param
 from GPy.core.parameterization.index_operations import ParameterIndexOperations
+from functools import reduce
 
 class ArrayCoreTest(unittest.TestCase):
     def setUp(self):

GPy/testing/pickle_tests.py

@@ -19,6 +19,7 @@ from GPy.kern._src.static import Bias, White
 from GPy.examples.dimensionality_reduction import mrd_simulation
 from GPy.core.parameterization.variational import NormalPosterior
 from GPy.models.gp_regression import GPRegression
+from functools import reduce
 
 def toy_model():
     X = np.linspace(0,1,50)[:, None]