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added first example and required instance #86

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Oct 1, 2024
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added first example and required instance #86

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fcda7f6
added first example and required instance
tomsmierz Sep 30, 2024
6e29256
commented uptade to 1.5
tomsmierz Sep 30, 2024
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89 changes: 89 additions & 0 deletions examples/instances/3x3x2.txt
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11 15 -0.342645305990952
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12 15 0.5023530387484465
12 16 0.4161687742404492
57 changes: 57 additions & 0 deletions examples/ising_model_on_a_kings_graph.jl
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using SpinGlassPEPS

function get_instance(topology::NTuple{3, Int})
m, n, t = topology
"$(@__DIR__)/instances/$(m)x$(n)x$(t).txt"
end

function run_square_diag_bench(::Type{T}; topology::NTuple{3, Int}) where {T}
m, n, _ = topology
instance = get_instance(topology)
lattice = super_square_lattice(topology)

best_energies = T[]

potts_h = potts_hamiltonian(
ising_graph(instance),
spectrum = full_spectrum,
cluster_assignment_rule = lattice,
)

params = MpsParameters{T}(; bond_dim = 16, num_sweeps = 1)
search_params = SearchParameters(; max_states = 2^8, cutoff_prob = 1E-4)

for transform ∈ all_lattice_transformations
net = PEPSNetwork{KingSingleNode{GaugesEnergy}, Dense, T}(
m, n, potts_h, transform,
)

ctr = MpsContractor{SVDTruncate, NoUpdate, T}(
net, params;
onGPU = false, beta = T(2), graduate_truncation = true,
)

# After update to SpinGlassEngine 1.5
# ctr = MpsContractor(SVDTruncate, net, params;
# onGPU = false, beta = T(2), graduate_truncation = true,
# )

droplets = SingleLayerDroplets(; max_energy = 10, min_size = 5, metric = :hamming)
merge_strategy = merge_branches(
ctr; merge_prob = :none , droplets_encoding = droplets,
)

sol, info = low_energy_spectrum(ctr, search_params, merge_strategy)

push!(best_energies, sol.energies[1])
clear_memoize_cache()
end

ground = minimum(best_energies)
@assert all(ground .≈ best_energies)

println("Best energy found: $(ground)")
end

T = Float32
@time run_square_diag_bench(T; topology = (3, 3, 2))
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