Fix FormNetwork constructor bug (#238)

Author: JoeyT1994

Project.toml

@@ -1,7 +1,7 @@
 name = "ITensorNetworks"
 uuid = "2919e153-833c-4bdc-8836-1ea460a35fc7"
 authors = ["Matthew Fishman <[email protected]>, Joseph Tindall <[email protected]> and contributors"]
-version = "0.13.9"
+version = "0.13.10"
 
 [deps]
 AbstractTrees = "1520ce14-60c1-5f80-bbc7-55ef81b5835c"

src/formnetworks/bilinearformnetwork.jl

@@ -1,4 +1,5 @@
 using ITensors: ITensor, Op, prime, sim
+using ITensors.NDTensors: denseblocks
 
 default_dual_site_index_map = prime
 default_dual_link_index_map = sim
@@ -54,7 +55,7 @@ end
 
 function itensor_identity_map(i_pairs::Vector)
   return prod(i_pairs; init=ITensor(one(Bool))) do i_pair
-    return delta(Bool, dag(first(i_pair)), last(i_pair))
+    return denseblocks(delta(last(i_pair), dag(first(i_pair))))
   end
 end