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GurobiSolver: Accept non-binary integer variables

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This commit is contained in:
Alinson S. Xavier
2021-08-13 10:15:23 -05:00
parent 9e023a375a
commit c6b31a827d
1 changed files with 5 additions and 11 deletions
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16
miplearn/solvers/gurobi.py
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@@ -523,12 +523,16 @@ class GurobiSolver(InternalSolver):
var.vtype = self.gp.GRB.CONTINUOUS var.vtype = self.gp.GRB.CONTINUOUS
var.lb = 0.0 var.lb = 0.0
var.ub = 1.0 var.ub = 1.0
elif self._var_types[i] == b"I":
var.vtype = self.gp.GRB.CONTINUOUS
with _RedirectOutput(streams): with _RedirectOutput(streams):
self.model.optimize() self.model.optimize()
self._dirty = False self._dirty = False
for (i, var) in enumerate(self._gp_vars): for (i, var) in enumerate(self._gp_vars):
if self._var_types[i] == b"B": if self._var_types[i] == b"B":
var.vtype = self.gp.GRB.BINARY var.vtype = self.gp.GRB.BINARY
elif self._var_types[i] == b"I":
var.vtype = self.gp.GRB.INTEGER
log = streams[0].getvalue() log = streams[0].getvalue()
self._has_lp_solution = self.model.solCount > 0 self._has_lp_solution = self.model.solCount > 0
self._has_mip_solution = False self._has_mip_solution = False
@@ -620,17 +624,7 @@ class GurobiSolver(InternalSolver):
f"Duplicated variable name detected: {var_names[i]}. " f"Duplicated variable name detected: {var_names[i]}. "
f"Unique variable names are currently required." f"Unique variable names are currently required."
) )
if var_types[i] == b"I": assert var_types[i] in [b"B", b"C", b"I"], (
assert var_ubs[i] == 1.0, (
"Only binary and continuous variables are currently supported. "
f"Integer variable {var_names[i]} has upper bound {var_ubs[i]}."
)
assert var_lbs[i] == 0.0, (
"Only binary and continuous variables are currently supported. "
f"Integer variable {var_names[i]} has lower bound {var_ubs[i]}."
)
var_types[i] = b"B"
assert var_types[i] in [b"B", b"C"], (
"Only binary and continuous variables are currently supported. " "Only binary and continuous variables are currently supported. "
f"Variable {var_names[i]} has type {var_types[i]}." f"Variable {var_names[i]} has type {var_types[i]}."
) )