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Add with_lhs argument

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This commit is contained in:
Alinson S. Xavier
2021-04-15 12:39:48 -05:00
parent 18521331c9
commit 4dd4ef52bd
4 changed files with 41 additions and 28 deletions
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18
miplearn/solvers/gurobi.py
View File

@@ -167,6 +167,7 @@ class GurobiSolver(InternalSolver):
self,
with_static: bool = True,
with_sa: bool = True,
with_lhs: bool = True,
) -> ConstraintFeatures:
model = self.model
assert model is not None
@@ -187,14 +188,15 @@ class GurobiSolver(InternalSolver):
if with_static:
rhs = tuple(model.getAttr("rhs", gp_constrs))
senses = tuple(model.getAttr("sense", gp_constrs))
lhs_l: List = [None for _ in gp_constrs]
for (i, gp_constr) in enumerate(gp_constrs):
expr = model.getRow(gp_constr)
lhs_l[i] = tuple(
(self._var_names[expr.getVar(j).index], expr.getCoeff(j))
for j in range(expr.size())
)
lhs = tuple(lhs_l)
if with_lhs:
lhs_l: List = [None for _ in gp_constrs]
for (i, gp_constr) in enumerate(gp_constrs):
expr = model.getRow(gp_constr)
lhs_l[i] = tuple(
(self._var_names[expr.getVar(j).index], expr.getCoeff(j))
for j in range(expr.size())
)
lhs = tuple(lhs_l)
if self._has_lp_solution:
dual_value = tuple(model.getAttr("pi", gp_constrs))

1
miplearn/solvers/internal.py
View File

@@ -173,6 +173,7 @@ class InternalSolver(ABC, EnforceOverrides):
self,
with_static: bool = True,
with_sa: bool = True,
with_lhs: bool = True,
) -> ConstraintFeatures:
pass

47
miplearn/solvers/pyomo/base.py
View File

@@ -132,6 +132,7 @@ class BasePyomoSolver(InternalSolver):
self,
with_static: bool = True,
with_sa: bool = True,
with_lhs: bool = True,
) -> ConstraintFeatures:
model = self.model
assert model is not None
@@ -162,26 +163,32 @@ class BasePyomoSolver(InternalSolver):
senses.append("=")
rhs.append(float(c.upper()))
# Extract LHS
lhsc = []
expr = c.body
if isinstance(expr, SumExpression):
for term in expr._args_:
if isinstance(term, MonomialTermExpression):
lhsc.append((term._args_[1].name, float(term._args_[0])))
elif isinstance(term, _GeneralVarData):
lhsc.append((term.name, 1.0))
else:
raise Exception(
f"Unknown term type: {term.__class__.__name__}"
)
elif isinstance(expr, _GeneralVarData):
lhsc.append((expr.name, 1.0))
else:
raise Exception(
f"Unknown expression type: {expr.__class__.__name__}"
)
lhs.append(tuple(lhsc))
if with_lhs:
# Extract LHS
lhsc = []
expr = c.body
if isinstance(expr, SumExpression):
for term in expr._args_:
if isinstance(term, MonomialTermExpression):
lhsc.append(
(
term._args_[1].name,
float(term._args_[0]),
)
)
elif isinstance(term, _GeneralVarData):
lhsc.append((term.name, 1.0))
else:
raise Exception(
f"Unknown term type: {term.__class__.__name__}"
)
elif isinstance(expr, _GeneralVarData):
lhsc.append((expr.name, 1.0))
else:
raise Exception(
f"Unknown expression type: {expr.__class__.__name__}"
)
lhs.append(tuple(lhsc))
# Extract dual values
if self._has_lp_solution: