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Add := operator for Boolean satisfiability problems #3530

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Oct 15, 2023
Merged

Add := operator for Boolean satisfiability problems #3530

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06b0d60
Add := operator for Boolean satisfiability problems
odow Sep 28, 2023
892bc1f
Update
odow Sep 28, 2023
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odow Sep 28, 2023
0bc09cf
Replace with dispatch
odow Oct 11, 2023
4199024
Refactor
odow Oct 12, 2023
9a93f0e
Restrict rhs to Bool
odow Oct 12, 2023
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Add docs
odow Oct 12, 2023
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odow Oct 13, 2023
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8 changes: 4 additions & 4 deletions docs/src/developers/extensions.md
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Expand Up @@ -200,20 +200,20 @@ julia> model = Model(); @variable(model, x);
julia> function JuMP.parse_constraint_head(
_error::Function,
::Val{:(:=)},
::Val{:≔},
lhs,
rhs,
)
println("Rewriting := as ==")
println("Rewriting ≔ as ==")
new_lhs, parse_code = MutableArithmetics.rewrite(lhs)
build_code = :(
build_constraint($(_error), $(new_lhs), MOI.EqualTo($(rhs)))
)
return false, parse_code, build_code
end
julia> @constraint(model, x + x := 1.0)
Rewriting := as ==
julia> @constraint(model, x + x ≔ 1.0)
Rewriting ≔ as ==
2 x = 1
```

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19 changes: 19 additions & 0 deletions src/constraints.jl
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Expand Up @@ -1542,3 +1542,22 @@ function relax_with_penalty!(
) where {T}
return relax_with_penalty!(model, Dict(); default = default)
end

function parse_constraint_head(error_fn::Function, ::Val{:(:=)}, lhs, rhs)
new_lhs, parse_code_lhs = _rewrite_expression(lhs)
new_rhs, parse_code_rhs = _rewrite_expression(rhs)
parse_code = quote
$parse_code_lhs
$parse_code_rhs
end
build_code = quote
if $new_rhs isa Bool
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Since we do it at the parsing level, it won't work if rhs is a Julia variable (not a JuMP decision variable) for which the value is a Bool right ?

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This part is at runtime. See the tests.

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Ah indeed. I guess it's best to add code inside the build_constraint that add code that is generated by the macro if possible

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@blegat blegat Sep 29, 2023 •
edited
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But in this case, it might be difficult

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@blegat blegat Sep 29, 2023 •
edited
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We would need a new JuMP set Equal with and do build_constraint(error, (a, b), JuMP.Equal())

ScalarConstraint($new_lhs, MOI.EqualTo($new_rhs))
elseif $new_lhs isa Bool
ScalarConstraint($new_rhs, MOI.EqualTo($new_lhs))
else
ScalarConstraint(op_equal_to($new_lhs, $new_rhs), MOI.EqualTo(true))
end
end
return false, parse_code, build_code
end
4 changes: 4 additions & 0 deletions src/macros.jl
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Expand Up @@ -1160,6 +1160,10 @@ function model_convert(model::AbstractModel, set::MOI.AbstractScalarSet)
return set
end

function model_convert(model::GenericModel{Bool}, set::MOI.EqualTo{Bool})
return set
end

function model_convert(model::AbstractModel, α::Number)
T = value_type(typeof(model))
V = variable_ref_type(model)
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76 changes: 76 additions & 0 deletions test/test_constraint.jl
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Expand Up @@ -1721,4 +1721,80 @@ function test_triangle_vec()
return
end

function test_def_equal_to_operator()
model = GenericModel{Bool}()
@variable(model, x[1:3])
# x[1] := x[2]
c = @constraint(model, x[1] := x[2])
o = constraint_object(c)
@test isequal_canonical(o.func, op_equal_to(x[1], x[2]))
@test o.set == MOI.EqualTo(true)
# x[1] == x[2] := false
c = @constraint(model, x[1] == x[2] := false)
o = constraint_object(c)
@test isequal_canonical(o.func, op_equal_to(x[1], x[2]))
@test o.set == MOI.EqualTo(false)
# x[1] && x[2] := false
c = @constraint(model, x[1] && x[2] := false)
o = constraint_object(c)
@test isequal_canonical(o.func, op_and(x[1], x[2]))
@test o.set == MOI.EqualTo(false)
# x[1] && x[2] := true
c = @constraint(model, x[1] && x[2] := true)
o = constraint_object(c)
@test isequal_canonical(o.func, op_and(x[1], x[2]))
@test o.set == MOI.EqualTo(true)
# x[1] || x[2] := y
y = true
c = @constraint(model, x[1] || x[2] := y)
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o = constraint_object(c)
@test isequal_canonical(o.func, op_or(x[1], x[2]))
@test o.set == MOI.EqualTo(y)
# y := x[1] || x[2]
y = true
c = @constraint(model, y := x[1] || x[2])
o = constraint_object(c)
@test isequal_canonical(o.func, op_or(x[1], x[2]))
@test o.set == MOI.EqualTo(y)
return
end

function test_def_equal_to_operator_float()
model = Model()
@variable(model, x[1:3])
# x[1] := x[2]
c = @constraint(model, x[1] := x[2])
o = constraint_object(c)
@test isequal_canonical(o.func, op_equal_to(x[1], x[2]))
@test o.set == MOI.EqualTo(1.0)
# x[1] == x[2] := false
c = @constraint(model, x[1] == x[2] := false)
o = constraint_object(c)
@test isequal_canonical(o.func, op_equal_to(x[1], x[2]))
@test o.set == MOI.EqualTo(0.0)
# x[1] && x[2] := false
c = @constraint(model, x[1] && x[2] := false)
o = constraint_object(c)
@test isequal_canonical(o.func, op_and(x[1], x[2]))
@test o.set == MOI.EqualTo(0.0)
# x[1] && x[2] := true
c = @constraint(model, x[1] && x[2] := true)
o = constraint_object(c)
@test isequal_canonical(o.func, op_and(x[1], x[2]))
@test o.set == MOI.EqualTo(1.0)
# x[1] || x[2] := y
y = true
c = @constraint(model, x[1] || x[2] := y)
o = constraint_object(c)
@test isequal_canonical(o.func, op_or(x[1], x[2]))
@test o.set == MOI.EqualTo(1.0)
# y := x[1] || x[2]
y = true
c = @constraint(model, y := x[1] || x[2])
o = constraint_object(c)
@test isequal_canonical(o.func, op_or(x[1], x[2]))
@test o.set == MOI.EqualTo(1.0)
return
end

end
4 changes: 2 additions & 2 deletions test/test_macros.jl
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Expand Up @@ -89,7 +89,7 @@ end

struct CustomType end

function JuMP.parse_constraint_head(_error::Function, ::Val{:(:=)}, lhs, rhs)
function JuMP.parse_constraint_head(_error::Function, ::Val{:≔}, lhs, rhs)
return false, :(), :(build_constraint($_error, $(esc(lhs)), $(esc(rhs))))
end

Expand Down Expand Up @@ -326,7 +326,7 @@ function test_extension_custom_expression_test(
)
model = ModelType()
@variable(model, x)
@constraint(model, con_ref, x := CustomType())
@constraint(model, con_ref, x ≔ CustomType())
con = constraint_object(con_ref)
@test jump_function(con) == x
@test moi_set(con) isa CustomSet
Expand Down
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