Linear constraint support in the builder
This commit is contained in:
Guillaume Pinot
committed by
Guillaume P
Guillaume P
parent
3df4ce5d4c
commit
04196f41d3
+248
-57
@@ -1,4 +1,5 @@
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use crate::proto;
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use proto::constraint_proto::Constraint as CstEnum;
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#[derive(Default, Debug)]
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pub struct CpModelBuilder {
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@@ -43,76 +44,149 @@ impl CpModelBuilder {
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}
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pub fn add_or(&mut self, vars: impl IntoIterator<Item = BoolVar>) -> Constraint {
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let index = self.proto.constraints.len();
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self.proto.constraints.push(proto::ConstraintProto {
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constraint: Some(proto::constraint_proto::Constraint::BoolOr(
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proto::BoolArgumentProto {
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literals: vars.into_iter().map(|v| v.0).collect(),
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},
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)),
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..Default::default()
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});
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Constraint(index)
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self.add_cst(CstEnum::BoolOr(proto::BoolArgumentProto {
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literals: vars.into_iter().map(|v| v.0).collect(),
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}))
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}
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pub fn add_and(&mut self, vars: impl IntoIterator<Item = BoolVar>) -> Constraint {
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let index = self.proto.constraints.len();
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self.proto.constraints.push(proto::ConstraintProto {
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constraint: Some(proto::constraint_proto::Constraint::BoolAnd(
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proto::BoolArgumentProto {
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literals: vars.into_iter().map(|v| v.0).collect(),
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},
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)),
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..Default::default()
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});
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Constraint(index)
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self.add_cst(CstEnum::BoolAnd(proto::BoolArgumentProto {
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literals: vars.into_iter().map(|v| v.0).collect(),
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}))
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}
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pub fn add_at_most_one(&mut self, vars: impl IntoIterator<Item = BoolVar>) -> Constraint {
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let index = self.proto.constraints.len();
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self.proto.constraints.push(proto::ConstraintProto {
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constraint: Some(proto::constraint_proto::Constraint::AtMostOne(
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proto::BoolArgumentProto {
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literals: vars.into_iter().map(|v| v.0).collect(),
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},
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)),
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..Default::default()
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});
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Constraint(index)
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self.add_cst(CstEnum::AtMostOne(proto::BoolArgumentProto {
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literals: vars.into_iter().map(|v| v.0).collect(),
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}))
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}
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pub fn add_exactly_one(&mut self, vars: impl IntoIterator<Item = BoolVar>) -> Constraint {
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let index = self.proto.constraints.len();
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self.proto.constraints.push(proto::ConstraintProto {
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constraint: Some(proto::constraint_proto::Constraint::ExactlyOne(
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proto::BoolArgumentProto {
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literals: vars.into_iter().map(|v| v.0).collect(),
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},
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)),
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..Default::default()
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});
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Constraint(index)
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self.add_cst(CstEnum::ExactlyOne(proto::BoolArgumentProto {
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literals: vars.into_iter().map(|v| v.0).collect(),
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}))
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}
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pub fn add_xor(&mut self, vars: impl IntoIterator<Item = BoolVar>) -> Constraint {
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self.add_cst(CstEnum::BoolXor(proto::BoolArgumentProto {
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literals: vars.into_iter().map(|v| v.0).collect(),
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}))
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}
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pub fn add_all_different(&mut self, vars: impl IntoIterator<Item = IntVar>) -> Constraint {
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self.add_cst(CstEnum::AllDiff(proto::AllDifferentConstraintProto {
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vars: vars.into_iter().map(|v| v.0).collect(),
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}))
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}
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pub fn add_linear_constraint(
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&mut self,
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expr: &LinearExpr,
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(begin, end): (i64, i64),
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) -> Constraint {
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self.add_cst(CstEnum::Linear(proto::LinearConstraintProto {
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vars: expr.vars.clone(),
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coeffs: expr.coeffs.clone(),
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domain: vec![begin - expr.constant, end - expr.constant],
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}))
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}
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pub fn add_eq<T: Into<LinearExpr>, U: Into<LinearExpr>>(
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&mut self,
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lhs: T,
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rhs: U,
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) -> Constraint {
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self.add_eq_by_ref(&lhs.into(), &rhs.into())
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}
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pub fn add_eq_by_ref(&mut self, lhs: &LinearExpr, rhs: &LinearExpr) -> Constraint {
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let (mut cst, val) = create_linear_proto(lhs, rhs);
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cst.domain.extend([val, val]);
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self.add_cst(CstEnum::Linear(cst))
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}
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pub fn add_ge<T: Into<LinearExpr>, U: Into<LinearExpr>>(
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&mut self,
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lhs: T,
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rhs: U,
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) -> Constraint {
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self.add_ge_by_ref(&lhs.into(), &rhs.into())
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}
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pub fn add_ge_by_ref(&mut self, lhs: &LinearExpr, rhs: &LinearExpr) -> Constraint {
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let (mut cst, val) = create_linear_proto(lhs, rhs);
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cst.domain.extend([val, i64::MAX]);
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self.add_cst(CstEnum::Linear(cst))
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}
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pub fn add_le<T: Into<LinearExpr>, U: Into<LinearExpr>>(
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&mut self,
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lhs: T,
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rhs: U,
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) -> Constraint {
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self.add_le_by_ref(&lhs.into(), &rhs.into())
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}
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pub fn add_le_by_ref(&mut self, lhs: &LinearExpr, rhs: &LinearExpr) -> Constraint {
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let (mut cst, val) = create_linear_proto(lhs, rhs);
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cst.domain.extend([i64::MIN, val]);
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self.add_cst(CstEnum::Linear(cst))
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}
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pub fn add_gt<T: Into<LinearExpr>, U: Into<LinearExpr>>(
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&mut self,
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lhs: T,
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rhs: U,
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) -> Constraint {
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self.add_gt_by_ref(&lhs.into(), &rhs.into())
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}
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pub fn add_gt_by_ref(&mut self, lhs: &LinearExpr, rhs: &LinearExpr) -> Constraint {
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let (mut cst, val) = create_linear_proto(lhs, rhs);
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cst.domain.extend([val + 1, i64::MAX]);
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self.add_cst(CstEnum::Linear(cst))
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}
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pub fn add_lt<T: Into<LinearExpr>, U: Into<LinearExpr>>(
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&mut self,
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lhs: T,
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rhs: U,
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) -> Constraint {
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self.add_lt_by_ref(&lhs.into(), &rhs.into())
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}
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pub fn add_lt_by_ref(&mut self, lhs: &LinearExpr, rhs: &LinearExpr) -> Constraint {
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let (mut cst, val) = create_linear_proto(lhs, rhs);
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cst.domain.extend([i64::MIN, val - 1]);
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self.add_cst(CstEnum::Linear(cst))
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}
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pub fn add_ne<T: Into<LinearExpr>, U: Into<LinearExpr>>(
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&mut self,
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lhs: T,
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rhs: U,
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) -> Constraint {
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self.add_ne_by_ref(&lhs.into(), &rhs.into())
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}
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pub fn add_ne_by_ref(&mut self, lhs: &LinearExpr, rhs: &LinearExpr) -> Constraint {
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let (mut cst, val) = create_linear_proto(lhs, rhs);
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cst.domain.extend([i64::MIN, val - 1, val + 1, i64::MAX]);
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self.add_cst(CstEnum::Linear(cst))
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}
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fn add_cst(&mut self, cst: CstEnum) -> Constraint {
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let index = self.proto.constraints.len();
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self.proto.constraints.push(proto::ConstraintProto {
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constraint: Some(proto::constraint_proto::Constraint::BoolXor(
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proto::BoolArgumentProto {
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literals: vars.into_iter().map(|v| v.0).collect(),
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},
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)),
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constraint: Some(cst),
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..Default::default()
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});
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Constraint(index)
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}
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pub fn add_all_different(&mut self, vars: impl IntoIterator<Item = IntVar>) -> Constraint {
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let index = self.proto.constraints.len();
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self.proto.constraints.push(proto::ConstraintProto {
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constraint: Some(proto::constraint_proto::Constraint::AllDiff(
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proto::AllDifferentConstraintProto {
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vars: vars.into_iter().map(|v| v.0).collect(),
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},
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)),
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..Default::default()
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pub fn minimize<T: Into<LinearExpr>>(&mut self, expr: T) {
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let expr = expr.into();
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self.proto.objective = Some(proto::CpObjectiveProto {
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vars: expr.vars,
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coeffs: expr.coeffs,
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offset: expr.constant as f64,
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scaling_factor: 1.,
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domain: vec![],
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});
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}
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pub fn maximize<T: Into<LinearExpr>>(&mut self, expr: T) {
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let mut expr = expr.into();
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for coeff in &mut expr.coeffs {
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*coeff *= -1;
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}
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self.proto.objective = Some(proto::CpObjectiveProto {
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vars: expr.vars,
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coeffs: expr.coeffs,
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offset: -expr.constant as f64,
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scaling_factor: -1.,
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domain: vec![],
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});
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Constraint(index)
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}
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pub fn stats(&self) -> String {
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@@ -161,13 +235,130 @@ impl From<BoolVar> for IntVar {
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impl IntVar {
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pub fn solution_value(self, response: &proto::CpSolverResponse) -> i64 {
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if self.0 < 0 {
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use std::ops::Not;
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1 - IntVar::from(BoolVar(self.0).not()).solution_value(response)
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1 - self.not().solution_value(response)
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} else {
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response.solution[self.0 as usize]
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}
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}
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fn not(self) -> Self {
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IntVar::from(!BoolVar(self.0))
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}
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}
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#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
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pub struct Constraint(usize);
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#[derive(Clone, Default, Debug)]
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pub struct LinearExpr {
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vars: Vec<i32>,
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coeffs: Vec<i64>,
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constant: i64,
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}
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impl std::ops::AddAssign<i64> for LinearExpr {
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fn add_assign(&mut self, rhs: i64) {
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self.constant += rhs;
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}
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}
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impl<V: Into<IntVar>> std::ops::AddAssign<(i64, V)> for LinearExpr {
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fn add_assign(&mut self, (coeff, var): (i64, V)) {
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let var = var.into();
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if var.0 < 0 {
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self.vars.push(var.not().0);
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self.coeffs.push(-coeff);
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self.constant += coeff;
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} else {
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self.vars.push(var.0);
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self.coeffs.push(coeff);
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}
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}
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}
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impl<V: Into<IntVar>> std::ops::AddAssign<V> for LinearExpr {
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fn add_assign(&mut self, var: V) {
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*self += (1, var);
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}
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}
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impl<V: Into<IntVar>> std::iter::Extend<(i64, V)> for LinearExpr {
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fn extend<I: IntoIterator<Item = (i64, V)>>(&mut self, iter: I) {
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for (coeff, var) in iter.into_iter() {
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*self += (coeff, var.into());
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}
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}
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}
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impl<V: Into<IntVar>> std::iter::FromIterator<(i64, V)> for LinearExpr {
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fn from_iter<I: IntoIterator<Item = (i64, V)>>(iter: I) -> Self {
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let mut res = Self::default();
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res.extend(iter);
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res
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}
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}
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impl<V: Into<IntVar>> std::iter::Extend<V> for LinearExpr {
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fn extend<I: IntoIterator<Item = V>>(&mut self, iter: I) {
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for var in iter.into_iter() {
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*self += var.into();
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}
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}
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}
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impl<V: Into<IntVar>> std::iter::FromIterator<V> for LinearExpr {
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fn from_iter<I: IntoIterator<Item = V>>(iter: I) -> Self {
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let mut res = Self::default();
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res.extend(iter);
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res
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}
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}
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impl<V: Into<IntVar>> From<V> for LinearExpr {
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fn from(var: V) -> Self {
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let mut res = Self::default();
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res += var;
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res
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}
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}
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impl From<i64> for LinearExpr {
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fn from(constant: i64) -> Self {
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let mut res = Self::default();
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res += constant;
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res
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}
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}
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impl<V: Into<IntVar>, const L: usize> From<[(i64, V); L]> for LinearExpr {
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fn from(expr: [(i64, V); L]) -> Self {
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let mut res = Self::default();
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for term in expr {
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res += term;
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}
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res
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}
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}
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impl<T> std::ops::Add<T> for LinearExpr
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where
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LinearExpr: std::ops::AddAssign<T>,
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{
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type Output = LinearExpr;
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fn add(mut self, rhs: T) -> Self::Output {
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self += rhs;
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self
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}
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}
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fn create_linear_proto(
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left: &LinearExpr,
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right: &LinearExpr,
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) -> (proto::LinearConstraintProto, i64) {
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(
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proto::LinearConstraintProto {
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vars: left
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.vars
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.iter()
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.copied()
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.chain(right.vars.iter().copied())
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.collect(),
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coeffs: left
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.coeffs
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.iter()
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.copied()
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.chain(right.coeffs.iter().map(|&c| -c))
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.collect(),
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domain: vec![],
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},
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right.constant - left.constant,
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)
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}
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