implemented changes suggested by cgranade

Author: ihincks

src/qinfer/domains.py

@@ -30,6 +30,7 @@
 
 from builtins import range
 from future.utils import with_metaclass
+from functools import reduce
 
 from operator import mul
 from scipy.special import binom
@@ -235,7 +236,7 @@ def values(self):
         """
         separate_values = [domain.values for domain in self._domains]
         return np.concatenate([
-            join_struct_arrays(map(np.array, value)) 
+            join_struct_arrays(list(map(np.array, value))) 
             for value in product(*separate_values)
         ])