def test_logPath(self):
name = self._testMethodName
prob = LpProblem(name, const.LpMinimize)
x = LpVariable("x", 0, 4)
y = LpVariable("y", -1, 1)
z = LpVariable("z", 0)
w = LpVariable("w", 0)
prob += x + 4 * y + 9 * z, "obj"
prob += x + y <= 5, "c1"
prob += x + z >= 10, "c2"
prob += -y + z == 7, "c3"
prob += w >= 0, "c4"
logFilename = name + ".log"
self.solver.optionsDict["logPath"] = logFilename
if self.solver.name in [
"CPLEX_PY",
"CPLEX_CMD",
"GUROBI",
"GUROBI_CMD",
"PULP_CBC_CMD",
"COIN_CMD",
]:
print("\t Testing logPath argument")
pulpTestCheck(
prob, self.solver, [const.LpStatusOptimal], {x: 4, y: -1, z: 6, w: 0}
)
if not os.path.exists(logFilename):
raise PulpError("Test failed for solver: {}".format(self.solver))
if not os.path.getsize(logFilename):
raise PulpError("Test failed for solver: {}".format(self.solver))
def pulpTestCheck(prob,
solver,
okstatus,
sol=None,
reducedcosts=None,
duals=None,
slacks=None,
eps=10**-3,
status=None,
objective=None,
**kwargs):
if status is None:
status = prob.solve(solver, **kwargs)
if status not in okstatus:
dumpTestProblem(prob)
raise PulpError(
"Tests failed for solver {}:\nstatus == {} not in {}\nstatus == {} not in {}"
.format(solver, status, okstatus, const.LpStatus[status],
[const.LpStatus[s] for s in okstatus]))
if sol is not None:
for v, x in sol.items():
if abs(v.varValue - x) > eps:
dumpTestProblem(prob)
raise PulpError(
"Tests failed for solver {}:\nvar {} == {} != {}".format(
solver, v, v.varValue, x))
if reducedcosts:
for v, dj in reducedcosts.items():
if abs(v.dj - dj) > eps:
dumpTestProblem(prob)
raise PulpError(
"Tests failed for solver {}:\nTest failed: var.dj {} == {} != {}"
.format(solver, v, v.dj, dj))
if duals:
for cname, p in duals.items():
c = prob.constraints[cname]
if abs(c.pi - p) > eps:
dumpTestProblem(prob)
raise PulpError(
"Tests failed for solver {}:\nconstraint.pi {} == {} != {}"
.format(solver, cname, c.pi, p))
if slacks:
for cname, slack in slacks.items():
c = prob.constraints[cname]
if abs(c.slack - slack) > eps:
dumpTestProblem(prob)
raise PulpError(
"Tests failed for solver {}:\nconstraint.slack {} == {} != {}"
.format(solver, cname, c.slack, slack))
if objective is not None:
z = prob.objective.value()
if abs(z - objective) > eps:
dumpTestProblem(prob)
raise PulpError(
"Tests failed for solver {}:\nobjective {} != {}".format(
solver, z, objective))
def pulpTestCheck(prob,
solver,
okstatus,
sol=None,
reducedcosts=None,
duals=None,
slacks=None,
eps=10**-3,
status=None,
objective=None,
**kwargs):
if status is None:
status = prob.solve(solver, **kwargs)
if status not in okstatus:
dumpTestProblem(prob)
print("Failure: status ==", status, "not in", okstatus)
print("Failure: status ==", const.LpStatus[status], "not in", \
[const.LpStatus[s] for s in okstatus])
raise PulpError("Tests failed for solver %s" % solver)
if sol is not None:
for v, x in sol.items():
if abs(v.varValue - x) > eps:
dumpTestProblem(prob)
print("Test failed: var", v, "==", v.varValue, "!=", x)
raise PulpError("Tests failed for solver %s" % solver)
if reducedcosts:
for v, dj in reducedcosts.items():
if abs(v.dj - dj) > eps:
dumpTestProblem(prob)
print("Test failed: var.dj", v, "==", v.dj, "!=", dj)
raise PulpError("Tests failed for solver %s" % solver)
if duals:
for cname, p in duals.items():
c = prob.constraints[cname]
if abs(c.pi - p) > eps:
dumpTestProblem(prob)
print("Test failed: constraint.pi", cname, "==", c.pi, "!=", p)
raise PulpError("Tests failed for solver %s" % solver)
if slacks:
for cname, slack in slacks.items():
c = prob.constraints[cname]
if abs(c.slack - slack) > eps:
dumpTestProblem(prob)
print("Test failed: constraint.slack", cname, "==", c.slack,
"!=", slack)
raise PulpError("Tests failed for solver %s" % solver)
if objective is not None:
z = prob.objective.value()
if abs(z - objective) > eps:
dumpTestProblem(prob)
print("Test failed: objective ", z, " != ", objective)
raise PulpError("Tests failed for solver %s" % solver)