Improve import/using code style

Author: emstoudenmire

test/solvers/test_tree_applyexp.jl

@@ -1,10 +1,10 @@
 using Test: @test, @testset
 using ITensors
-using TensorOperations # Needed to use contraction order finding
-import ITensorNetworks: dmrg, maxlinkdim, siteinds, time_evolve, ttn
-import Graphs: add_vertex!, add_edge!, vertices
-import NamedGraphs: NamedGraph
-import ITensorMPS: OpSum
+using ITensorNetworks: dmrg, maxlinkdim, siteinds, time_evolve, ttn
+using Graphs: add_vertex!, add_edge!, vertices
+using NamedGraphs: NamedGraph
+using ITensorMPS: OpSum
+using TensorOperations: TensorOperations #For contraction order finding
 
 function chain_plus_ancilla(; nchain)
   g = NamedGraph()

test/solvers/test_tree_eigsolve.jl

@@ -1,9 +1,9 @@
 using Test: @test, @testset
 using ITensors
-using TensorOperations # Needed to use contraction order finding
 using ITensorNetworks: siteinds, ttn, dmrg
-import Graphs: dst, edges, src
-import ITensorMPS: OpSum
+using Graphs: dst, edges, src, vertices
+using ITensorMPS: OpSum
+using TensorOperations: TensorOperations #For contraction order finding
 
 include("utilities/simple_ed_methods.jl")
 include("utilities/tree_graphs.jl")
@@ -27,7 +27,7 @@ include("utilities/tree_graphs.jl")
 
   # Make initial product state
   state = Dict{Tuple{Int,Int},String}()
-  for (j, v) in enumerate(gr.vertices(sites))
+  for (j, v) in enumerate(vertices(sites))
     state[v] = iseven(j) ? "Up" : "Dn"
   end
   psi0 = ttn(state, sites)

test/solvers/utilities/simple_ed_methods.jl

@@ -1,4 +1,4 @@
-import ITensorNetworks: AbstractITensorNetwork
+using ITensorNetworks: AbstractITensorNetwork
 
 function ed_ground_state(H, psi0)
   ITensors.disable_warn_order()

test/solvers/utilities/tree_graphs.jl

@@ -1,5 +1,5 @@
-import Graphs as gr
-import NamedGraphs as ng
+using Graphs: add_edge!, add_vertex!
+using NamedGraphs: NamedGraph
 
 """
   build_tree
@@ -8,15 +8,15 @@ import NamedGraphs as ng
   nbranch branches of nbranch_sites each.
 """
 function build_tree(; nbranch=3, nbranch_sites=3)
-  g = ng.NamedGraph()
-  gr.add_vertex!(g, (0, 0))
+  g = NamedGraph()
+  add_vertex!(g, (0, 0))
   for branch in 1:nbranch, site in 1:nbranch_sites
-    gr.add_vertex!(g, (branch, site))
+    add_vertex!(g, (branch, site))
   end
   for branch in 1:nbranch
-    gr.add_edge!(g, (0, 0)=>(branch, 1))
+    add_edge!(g, (0, 0)=>(branch, 1))
     for site in 2:nbranch_sites
-      gr.add_edge!(g, (branch, site-1)=>(branch, site))
+      add_edge!(g, (branch, site-1)=>(branch, site))
     end
   end
   return g