def test_pulp_022(self):
# Initial value
prob = LpProblem("test022", const.LpMinimize)
x = LpVariable("x", 0, 4)
y = LpVariable("y", -1, 1)
z = LpVariable("z", 0, None, const.LpInteger)
prob += x + 4 * y + 9 * z, "obj"
prob += x + y <= 5, "c1"
prob += x + z >= 10, "c2"
prob += -y + z == 7.5, "c3"
# if we give the actual optimal solution to CBC (x=3)
# it returns a weird solution with mip_start
x.setInitialValue(4)
y.setInitialValue(-0.5)
z.setInitialValue(7)
self.solver.mip_start = True
print("\t Testing MIP solution")
if self.solver.__class__ in [COIN_CMD, PULP_CBC_CMD]:
warnings.warn("CBC gives a wrong solution with mip start.")
else:
pulpTestCheck(prob, self.solver, [const.LpStatusOptimal], {
x: 3,
y: -0.5,
z: 7
})
def test_pulp_022(self):
# Initial value
prob = LpProblem("test022", const.LpMinimize)
x = LpVariable("x", 0, 4)
y = LpVariable("y", -1, 1)
z = LpVariable("z", 0, None, const.LpInteger)
prob += x + 4 * y + 9 * z, "obj"
prob += x + y <= 5, "c1"
prob += x + z >= 10, "c2"
prob += -y + z == 7.5, "c3"
x.setInitialValue(3)
y.setInitialValue(-0.5)
z.setInitialValue(7)
if self.solver.name in ["GUROBI", "GUROBI_CMD", "CPLEX_CMD", "CPLEX_PY"]:
self.solver.optionsDict["warmStart"] = True
print("\t Testing Initial value in MIP solution")
pulpTestCheck(prob, self.solver, [const.LpStatusOptimal], {x: 3, y: -0.5, z: 7})
def test_pulp_022(self):
# Initial value
prob = LpProblem("test022", const.LpMinimize)
x = LpVariable("x", 0, 4)
y = LpVariable("y", -1, 1)
z = LpVariable("z", 0, None, const.LpInteger)
prob += x + 4 * y + 9 * z, "obj"
prob += x + y <= 5, "c1"
prob += x + z >= 10, "c2"
prob += -y + z == 7.5, "c3"
x.setInitialValue(3)
y.setInitialValue(-0.5)
z.setInitialValue(7)
if self.solver.name in ['GUROBI', 'GUROBI_CMD', 'CPLEX_CMD', 'CPLEX_PY']:
warnings.warn("CBC gives a wrong solution with warmStart.")
self.solver.optionsDict['warmStart'] = True
print("\t Testing MIP solution")
pulpTestCheck(prob, self.solver, [const.LpStatusOptimal], {x: 3, y: -0.5, z: 7})
def init_one(a: pulp.LpVariable, b: float) -> None:
a.setInitialValue(b)
