def solve(self, mdl, parameters=None, **kwargs):
# Before submitting the job, we will build the list of attachments
# parameters are CPLEX parameters
lex_mipstart = kwargs.pop('_lex_mipstart', None)
attachments = []
# make sure model is the first attachment: that will be the name of the job on the console
job_name = normalize_basename("python_%s" % mdl.name)
model_file = self.serialize_model_as_file(mdl)
try:
model_data_name = self._make_attachment_name(
job_name, self._exchange_format.extension)
attachments.append({
'name': model_data_name,
'filename': model_file
})
# prm
docloud_parameters = parameters if parameters is not None else mdl.parameters
prm_data = self._serialize_parameters(docloud_parameters)
prm_name = self._make_attachment_name(job_name, '.prm')
attachments.append({'name': prm_name, 'data': prm_data})
# warmstart_data
# export mipstart solution in CPLEX mst format, if any, else None
# if within a lexicographic solve, th elex_mipstart supersedes allother mipstarts
if lex_mipstart:
mipstart_name = lex_mipstart.name.lower(
) if lex_mipstart.name else job_name
warmstart_data = SolutionMSTPrinter.print_to_string(
lex_mipstart).encode('utf-8')
warmstart_name = self._make_attachment_name(
mipstart_name, ".mst")
attachments.append({
'name': warmstart_name,
'data': warmstart_data
})
elif mdl.number_of_mip_starts:
mipstart_name = job_name
warmstart_name = self._make_attachment_name(
mipstart_name, ".mst")
mdl_mipstarts = [s for s, _ in mdl.iter_mip_starts()]
mdl_efforts = [eff for (_, eff) in mdl.iter_mip_starts()]
warmstart_data = SolutionMSTPrinter.print_to_string(
mdl_mipstarts, effort_level=mdl_efforts,
use_lp_names=True).encode('utf-8')
attachments.append({
'name': warmstart_name,
'data': warmstart_data
})
# benders annotation
if mdl.has_benders_annotations():
anno_data = ModelAnnotationPrinter.print_to_string(mdl).encode(
'utf-8')
anno_name = self._make_attachment_name(job_name, '.ann')
attachments.append({'name': anno_name, 'data': anno_data})
# info_to_monitor = {'jobid'}
# if mdl.progress_listeners:
# info_to_monitor.add('progress')
def notify_info(info):
if "jobid" in info:
mdl.fire_jobid(jobid=info["jobid"])
if "progress" in info:
mdl.fire_progress(progress_data=info["progress"])
# This block used to be try/catched for DOcloudConnector exceptions
# and DOcloudException, but then infrastructure error were not
# handled properly. Now we let the exception raise.
connector = self._connector
mdl.notify_start_solve()
connector.submit_model_data(
attachments,
gzip=not self._exchange_format.is_binary,
info_callback=notify_info,
info_to_monitor={'jobid', 'progress'})
# --- cplex solve details
json_details = connector.get_cplex_details()
self._solve_details = SolveDetails.from_json(json_details)
self._solve_details._quality_metrics = self._compute_quality_metrics(
json_details)
# ---
# --- build a solution object, or None
solution_handler = JSONSolutionHandler(
connector.results.get('solution.json'))
if not solution_handler.has_solution:
mdl.notify_solve_failed()
solution = None
else:
solution = self._make_solution(mdl, solution_handler)
# ---
return solution
finally:
if os.path.isfile(model_file):
os.remove(model_file)
def export_one_mip_start(self, mipstart, job_name, attachments):
warmstart_data = SolutionMSTPrinter.print_to_string(mipstart).encode(
'utf-8')
mipstart_name = mipstart.name.lower() if mipstart.name else job_name
warmstart_name = self._make_attachment_name(mipstart_name, ".mst")
attachments.append({'name': warmstart_name, 'data': warmstart_data})