CPU Zipper strategy execution error

[annamariadziubyna]

I am encountering an issue when trying to execute a Zipper strategy on the CPU. The problem occurs specifically with the code provided below.
https://github.com/euro-hpc-pl/SpinGlassEngine.jl/blob/Zipper_CPU/test/mwe.jl

[bartekGardas]

@tomsmierz this should be an easy fix ...

[bartekGardas]

@lpawela has this been resolved and merged?

[lpawela]

There are hard-coded CuArray calls in https://github.com/euro-hpc-pl/SpinGlassTensors.jl/blob/Zipper_CPU/src/contractions/central.jl which probably lead to mixed CPU-GPU matrix multiplications. Probably can be relative easily resolved. The more important question is: why the test suite didn't catch this earlier?

Another problem I encountered when trying to reproduce this using the provided MWE using the code on the master branch is

ERROR: LoadError: UndefVarError: `save_object` not defined
Stacktrace:
 [1] truncate_potts_hamiltonian_2site_BP(potts_h::LabelledGraphs.LabelledGraph{MetaGraphs.MetaDiGraph{Int64, Float64}, Tuple{Int64, Int64, Int64}}, beliefs::Dict{Any, Any}, num_states::Int64, result_folder::String, inst::String; beta::Float64)
   @ SpinGlassNetworks ~/.julia/packages/SpinGlassNetworks/04D6H/src/truncate.jl:132
 [2] truncate_potts_hamiltonian_2site_BP
   @ ~/.julia/packages/SpinGlassNetworks/04D6H/src/truncate.jl:107 [inlined]
 [3] truncate_potts_hamiltonian(potts_h::LabelledGraphs.LabelledGraph{MetaGraphs.MetaDiGraph{Int64, Float64}, Tuple{Int64, Int64, Int64}}, β::Float64, cs::Int64, result_folder::String, inst::String; tol::Float64, iter::Int64)
   @ SpinGlassNetworks ~/.julia/packages/SpinGlassNetworks/04D6H/src/truncate.jl:188
 [4] top-level scope
   @ ~/new-zksi-repo/SpinGlassEngine.jl/test/mwe.jl:32
in expression starting at /home/lpawela/new-zksi-repo/SpinGlassEngine.jl/test/mwe.jl:32