specialize on BlockedTrivialPermutation

Author: ogauthe

src/fusiontensor/tensor_algebra_interface.jl

@@ -41,20 +41,12 @@ struct FusionTensorFusionStyle <: FusionStyle end
 
 TensorAlgebra.FusionStyle(::Type{<:FusionTensor}) = FusionTensorFusionStyle()
 
-function TensorAlgebra.matricize(
-  ::FusionTensorFusionStyle, ft::AbstractArray, biperm::AbstractBlockPermutation{2}
-)
-  permuted = permutedims(ft, biperm)
-  return FusionTensor(
-    data_matrix(permuted), (codomain_axis(permuted),), (domain_axis(permuted),)
-  )
-end
-
-# lift ambiguity
 function TensorAlgebra.matricize(
   ::FusionTensorFusionStyle, ft::AbstractArray, biperm::BlockedTrivialPermutation{2}
 )
-  return matricize(FusionTensorFusionStyle(), ft, blockedperm(BlockedTuple(tbp)))
+  blocklengths(biperm) == blocklengths(axes(ft)) ||
+    throw(ArgumentError("Invalid trivial biperm"))
+  return FusionTensor(data_matrix(ft), (codomain_axis(ft),), (domain_axis(ft),))
 end
 
 function TensorAlgebra.unmatricize(::FusionTensorFusionStyle, m, blocked_axes)