Fixed bug in the product of kernels with tied parameters

GPy/core/parameterised.py

@@ -102,6 +102,11 @@ class parameterised(object):
         else:
             return expr
 
+    def Nparam_transformed(self):
+            ties = 0
+            for ar in self.tied_indices:
+                ties += ar.size - 1
+            return self.Nparam - len(self.constrained_fixed_indices) - ties
 
     def constrain_positive(self, which):
         """
@@ -149,8 +154,6 @@ class parameterised(object):
 
 
 
-
-
     def constrain_negative(self,which):
         """
         Set negative constraints.