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add sdd smoothing #81

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Mar 22, 2021
Merged

add sdd smoothing #81

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8 changes: 8 additions & 0 deletions src/sdd/sdd_functions.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -227,3 +227,11 @@ import Base: xor
"Exclusive logical disjunction (XOR)"
xor(x::Sdd,y::Sdd) = (x ∧ ¬y) ∨ (y ∧ ¬x)

"Smooth an sdd to a StructLogicCircuit"
function smooth(root::Sdd)::StructLogicCircuit
lc = LogicCircuit(root)
plc = propagate_constants(lc, remove_unary=true)
slc = StructLogicCircuit(root.vtree, plc)
smooth(slc)
end

24 changes: 24 additions & 0 deletions test/sdd/sdds_test.jl
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Expand Up @@ -45,4 +45,28 @@ include("../helper/validate_sdd.jl")

end

end

@testset "sdd smoothing test" begin
cnfs = [
("easy","C17_mince",32,92,45)
("easy","majority_mince",32,132,61)
("easy","b1_mince",8,169,84)
("easy","cm152a_mince",2048,127,62)
("iscas89","s208.1.scan",262144,1942,927)
]


for (suite, name, count, size, nodes) in cnfs

cnf = zoo_cnf("$suite/$name.cnf")
vtree = zoo_vtree("$suite/$name.min.vtree");

mgr = SddMgr(vtree)
cnfΔ = compile(mgr, cnf)

smooth_slc = smooth(cnfΔ)
@test issmooth(smooth_slc)
@test respects_vtree(smooth_slc, vtree)
end
end