def to_lp(self):
self.update()
with TemporaryFilename(suffix=".lp") as tmp_file_name:
glp_write_lp(self.problem, None, tmp_file_name)
with open(tmp_file_name) as tmp_file:
lp_form = tmp_file.read()
return lp_form
def _glpk_representation(self):
self.update()
with TemporaryFilename(suffix=".glpk") as tmp_file_name:
glp_write_prob(self.problem, 0, tmp_file_name)
with open(tmp_file_name) as tmp_file:
glpk_form = tmp_file.read()
return glpk_form
def __getstate__(self):
self.update()
with TemporaryFilename(suffix=".lp") as tmp_file_name:
self.problem.write(tmp_file_name)
with open(tmp_file_name) as tmp_file:
lp_form = tmp_file.read()
repr_dict = {'lp': lp_form, 'status': self.status, 'config': self.configuration}
return repr_dict
def __getstate__(self):
self.update()
with TemporaryFilename(suffix=".sav") as tmp_file_name:
self.problem.write(tmp_file_name)
with open(tmp_file_name, "rb") as tmp_file:
cplex_binary = tmp_file.read()
repr_dict = {'cplex_binary': cplex_binary, 'status': self.status, 'config': self.configuration}
return repr_dict
def _glpk_representation(self):
self.update()
with TemporaryFilename(suffix=".glpk") as tmp_file_name:
code = glp_write_prob(self.problem, 0, tmp_file_name)
if code != 0:
raise Exception("GLPK could not successfully create the GLPK file.")
with open(tmp_file_name, "r") as tmp_file:
glpk_form = tmp_file.read()
return glpk_form
def to_lp(self):
self.update()
with TemporaryFilename(suffix=".lp") as tmp_file_name:
code = glp_write_lp(self.problem, None, tmp_file_name)
if code != 0:
raise Exception("GLPK could not successfully create the LP.")
with open(tmp_file_name) as tmp_file:
lp_form = tmp_file.read()
return lp_form
def __setstate__(self, repr_dict):
with TemporaryFilename(suffix=".glpk", content=repr_dict["glpk_repr"]) as tmp_file_name:
problem = glp_create_prob()
code = glp_read_prob(problem, 0, tmp_file_name)
if code != 0:
with open(tmp_file_name) as tmp_file:
invalid_problem = tmp_file.read()
raise Exception("The GLPK file " + tmp_file_name + " does not seem to contain a valid GLPK problem:\n\n" + invalid_problem)
self.__init__(problem=problem)
self.configuration = Configuration.clone(repr_dict['config'], problem=self)
if repr_dict['glpk_status'] == 'optimal':
self.optimize() # since the start is an optimal solution, nothing will happen here
def __setstate__(self, repr_dict):
with TemporaryFilename(
suffix=".glpk",
content=repr_dict["glpk_repr"]) as tmp_file_name:
problem = glp_create_prob()
glp_read_prob(problem, 0, tmp_file_name)
self.__init__(problem=problem)
self.configuration = Configuration.clone(repr_dict['config'],
problem=self)
if repr_dict['glpk_status'] == 'optimal':
self.optimize(
) # since the start is an optimal solution, nothing will happen here
def __setstate__(self, repr_dict):
with TemporaryFilename(suffix=".lp", content=repr_dict["lp"]) as tmp_file_name:
problem = gurobipy.read(tmp_file_name)
# if repr_dict['status'] == 'optimal': # TODO: uncomment this
# # turn off logging completely, get's configured later
# problem.set_error_stream(None)
# problem.set_warning_stream(None)
# problem.set_log_stream(None)
# problem.set_results_stream(None)
# problem.solve() # since the start is an optimal solution, nothing will happen here
self.__init__(problem=problem)
self.configuration = Configuration.clone(repr_dict['config'], problem=self) # TODO: make configuration work
def __setstate__(self, repr_dict):
with TemporaryFilename(suffix=".sav") as tmp_file_name:
with open(tmp_file_name, "wb") as tmp_file:
tmp_file.write(repr_dict["cplex_binary"])
problem = cplex.Cplex()
# turn off logging completely, get's configured later
problem.set_error_stream(None)
problem.set_warning_stream(None)
problem.set_log_stream(None)
problem.set_results_stream(None)
problem.read(tmp_file_name)
if repr_dict['status'] == 'optimal':
problem.solve() # since the start is an optimal solution, nothing will happen here
self.__init__(problem=problem)
self.configuration = Configuration.clone(repr_dict['config'], problem=self)
def from_lp(cls, lp_form):
problem = glp_create_prob()
with TemporaryFilename(suffix=".lp", content=lp_form) as tmp_file_name:
glp_read_lp(problem, None, tmp_file_name)
model = cls(problem=problem)
return model
def from_lp(cls, lp_form):
with TemporaryFilename(suffix=".lp", content=lp_form) as tmp_file_name:
problem = gurobipy.read(tmp_file_name)
model = cls(problem=problem)
return model
def from_lp(cls, lp_form):
problem = mip.Model(solver_name=mip.CBC)
with TemporaryFilename(suffix=".lp", content=lp_form) as tmp_file_name:
problem.read(tmp_file_name)
model = cls(problem=problem)
return model