220 lines
5.9 KiB
Julia
220 lines
5.9 KiB
Julia
using JLD
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using JuMP
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using SCS
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using GroupRings
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using PropertyT
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using ValidatedNumerics
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import Nemo: Group, GroupElem
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using ArgParse
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include("OrbitDecomposition.jl")
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immutable OrbitData
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name::String
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Us::Vector
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Ps::Vector{Array{JuMP.Variable,2}}
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cnstr::Vector
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laplacian::Vector
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laplacianSq::Vector
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dims::Vector{Int}
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end
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immutable Settings
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name::String
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N::Int
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G::Group
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S::Vector
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AutS::Group
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radius::Int
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solver::SCSSolver
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upper_bound::Float64
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tol::Float64
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end
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function sparsify{T}(U::Array{T}, eps=eps(T))
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n = rank(U)
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W = deepcopy(U)
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W[abs.(W) .< eps] = zero(T)
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if rank(W) != n
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warn("Sparsification would decrease the rank!")
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W = U
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end
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W = sparse(W)
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dropzeros!(W)
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return W
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end
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function sparsify!{T}(U::SparseMatrixCSC{T}, eps=eps(T))
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U[abs.(U) .< eps] = zero(T)
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dropzeros!(U)
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return U
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end
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small_to_zero!{T}(A::AbstractArray{T}, eps=eps(T)) = A[abs(A) .< eps] = zero(T)
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function init_model(Uπs)
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m = JuMP.Model();
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l = size(Uπs,1)
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P = Vector{Array{JuMP.Variable,2}}(l)
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for k in 1:l
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s = size(Uπs[k],2)
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P[k] = JuMP.@variable(m, [i=1:s, j=1:s])
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JuMP.@SDconstraint(m, P[k] >= 0.0)
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end
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JuMP.@variable(m, λ >= 0.0)
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JuMP.@objective(m, Max, λ)
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return m, P
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end
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function init_OrbitData(name::String)
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splap = load(joinpath(name, "delta.jld"), "Δ");
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pm = load(joinpath(name, "pm.jld"), "pm");
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cnstr = PropertyT.constraints_from_pm(pm);
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splap² = GroupRings.mul(splap, splap, pm);
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Uπs = load(joinpath(name, "U_pis.jld"), "Uπs");
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# Uπs = sparsify.(Uπs);
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#dimensions of the corresponding πs:
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dims = load(joinpath(name, "U_pis.jld"), "dims")
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m, P = init_model(Uπs);
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orbits = load(joinpath(name, "orbits.jld"), "orbits");
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n = size(Uπs[1],1)
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orb_spcnstrm = [orbit_constraint(cnstr[collect(orb)], n) for orb in orbits]
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orb_splap = orbit_spvector(splap, orbits)
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orb_splap² = orbit_spvector(splap², orbits)
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orbData = OrbitData(name, Uπs, P, orb_spcnstrm, orb_splap, orb_splap², dims);
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return m, orbData
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end
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function transform{T}(U::AbstractArray{T,2}, V::AbstractArray{T,2}, eps=eps(T); sparse=true)
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w = U'*V*U
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sparse && sparsify!(w, eps)
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return w
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end
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A(data::OrbitData, π, t) = data.dims[π]*transform(data.Us[π], data.cnstr[t])
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function constrLHS(m::JuMP.Model, data::OrbitData, t)
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l = endof(data.Us)
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lhs = @expression(m, sum(vecdot(A(data, π, t), data.Ps[π]) for π in 1:l))
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return lhs
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end
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function addconstraints!(m::JuMP.Model, data::OrbitData, l::Int=length(data.cnstr); var::Symbol = :λ)
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λ = m[var]
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for t in 1:l
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d, d² = data.laplacian[t], data.laplacianSq[t]
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lhs = constrLHS(m, data, t)
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if lhs == zero(lhs)
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if d == 0 && d² == 0
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info("Detected empty constraint")
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continue
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else
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warn("Adding unsatisfiable constraint!")
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end
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end
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JuMP.@constraint(m, lhs == d² - λ*d)
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end
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end
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function reconstructP(m::JuMP.Model, data::OrbitData)
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computedPs = [getvalue(P) for P in data.Ps]
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return sum(
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data.dims[π]*transform(data.Us[π]',computedPs[π], sparse=false)
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for π in 1:endof(data.Ps))
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end
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function create_SDP_problem(name::String; upper_bound=Inf)
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info(PropertyT.logger, "Loading data....")
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t = @timed SDP_problem, orb_data = init_OrbitData(name);
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info(PropertyT.logger, PropertyT.timed_msg(t))
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if upper_bound < Inf
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λ = JuMP.getvariable(SDP_problem, :λ)
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JuMP.@constraint(SDP_problem, λ <= upper_bound)
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end
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info(PropertyT.logger, "Adding constraints... ")
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t = @timed addconstraints!(SDP_problem, orb_data)
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info(PropertyT.logger, PropertyT.timed_msg(t))
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return SDP_problem, orb_data
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end
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function λandP(m::JuMP.Model, data::OrbitData)
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info(PropertyT.logger, "Solving SDP problem...")
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varλ = m[:λ]
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varP = data.Ps
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λ, P = PropertyT.λandP(data.name, m, varλ, varP)
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recP = reconstructP(m, data)
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fname = PropertyT.λSDPfilenames(data.name)[2]
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save(fname, "origP", P, "P", recP)
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return λ, recP
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end
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function init_orbit_data(logger, sett::Settings; radius=2)
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ex(fname) = isfile(joinpath(sett.name, fname))
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files_exists = ex.(["delta.jld", "pm.jld", "U_pis.jld", "orbits.jld"])
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if !all(files_exists)
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compute_orbit_data(logger, sett.name, sett.G, sett.S, sett.AutS, radius=radius)
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end
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return 0
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end
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function orbit_check_propertyT(logger, sett::Settings)
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init_orbit_data(logger, sett, radius=sett.radius)
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Δ = PropertyT.ΔandSDPconstraints(sett.name, sett.G)[1]
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fnames = PropertyT.λSDPfilenames(sett.name)
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if all(isfile.(fnames))
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λ, P = PropertyT.λandP(sett.name)
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else
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info(logger, "Creating SDP problem...")
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SDP_problem, orb_data = create_SDP_problem(sett.name, upper_bound=sett.upper_bound)
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JuMP.setsolver(SDP_problem, sett.solver)
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λ, P = λandP(SDP_problem, orb_data)
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end
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info(logger, "λ = $λ")
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info(logger, "sum(P) = $(sum(P))")
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info(logger, "maximum(P) = $(maximum(P))")
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info(logger, "minimum(P) = $(minimum(P))")
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if λ > 0
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sgap = PropertyT.check_distance_to_positive_cone(Δ, λ, P, 2*sett.radius, tol=sett.tol, rational=false)
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if isa(sgap, Interval)
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sgap = sgap.lo
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end
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if sgap > 0
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info(logger, "λ ≥ $(Float64(trunc(sgap,12)))")
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Kazhdan_κ = PropertyT.Kazhdan_from_sgap(sgap, length(sett.S))
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Kazhdan_κ = Float64(trunc(Kazhdan_κ, 12))
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info(logger, "κ($(sett.name), S) ≥ $Kazhdan_κ: Group HAS property (T)!")
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return true
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else
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sgap = Float64(trunc(sgap, 12))
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info(logger, "λ($(sett.name), S) ≥ $sgap: Group may NOT HAVE property (T)!")
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return false
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end
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end
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info(logger, "κ($(sett.name), S) ≥ $λ < 0: Tells us nothing about property (T)")
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return false
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end
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