Fixups

python/dune/perftool/sumfact/symbolic.py

@@ -191,7 +191,7 @@ class SumfactKernel(SumfactKernelBase, ImmutableRecord, prim.Variable):
     def flat_input_shape(self):
         """ The 'flat' input tensor shape """
         assert self.stage == 1
-        return (product(mat.basis_size for mat in self.matrix_sequence),)
+        return (product(mat.basis_size for mat in self.matrix_sequence), 1)
 
     @property
     def quadrature_shape(self):
@@ -271,6 +271,9 @@ class SumfactKernel(SumfactKernelBase, ImmutableRecord, prim.Variable):
     def horizontal_width(self):
         return 1
 
+    def horizontal_index(self, _):
+        return 0
+
     @property
     def vertical_width(self):
         return 1