def __init__(self, **kwds):
#
# Call base class constructor
#
kwds['type'] = 'xpress'
ILMLicensedSystemCallSolver.__init__(self, **kwds)
self.is_mip = kwds.pop('is_mip', False)
#
# Define valid problem formats and associated results formats
#
self._valid_problem_formats = [ProblemFormat.cpxlp, ProblemFormat.mps]
self._valid_result_formats = {}
self._valid_result_formats[ProblemFormat.cpxlp] = [ResultsFormat.soln]
self._valid_result_formats[ProblemFormat.mps] = [ResultsFormat.soln]
self.set_problem_format(ProblemFormat.cpxlp)
#
# Cache the problem type - LP or MIP. Xpress needs to know this
# on the command-line, and it matters when reading the solution file.
#
# Note: Undefined capabilities default to 'None'
self._capabilities = Options()
self._capabilities.linear = True
self._capabilities.quadratic_objective = True
self._capabilities.quadratic_constraint = True
self._capabilities.integer = True
self._capabilities.sos1 = True
self._capabilities.sos2 = True
def __init__(self, **kwds):
#
# Call base class constructor
#
kwds['type'] = 'cplex'
ILMLicensedSystemCallSolver.__init__(self, **kwds)
# NOTE: eventually both of the following attributes should be migrated to a common base class.
# is the current solve warm-started? a transient data member to communicate state information
# across the _presolve, _apply_solver, and _postsolve methods.
self._warm_start_solve = False
# related to the above, the temporary name of the MST warm-start file (if any).
self._warm_start_file_name = None
#
# Define valid problem formats and associated results formats
#
self._valid_problem_formats = [ProblemFormat.cpxlp, ProblemFormat.mps]
self._valid_result_formats = {}
self._valid_result_formats[ProblemFormat.cpxlp] = [ResultsFormat.soln]
self._valid_result_formats[ProblemFormat.mps] = [ResultsFormat.soln]
self.set_problem_format(ProblemFormat.cpxlp)
# Note: Undefined capabilities default to 'None'
self._capabilities = Options()
self._capabilities.linear = True
self._capabilities.quadratic_objective = True
self._capabilities.quadratic_constraint = True
self._capabilities.integer = True
self._capabilities.sos1 = True
self._capabilities.sos2 = True
def __init__(self, **kwds):
logger.warning(
"The shell interface for Xpress is broken for recent versions "\
"of Xpress. Please use xpress_direct or xpress_persistent, "\
"which require the Xpress Python API. Python bindings "\
"for recent versions of Xpress can be installed via `pip`: "\
"<https://pypi.org/project/xpress/>.")
#
# Call base class constructor
#
kwds['type'] = 'xpress'
ILMLicensedSystemCallSolver.__init__(self, **kwds)
self.is_mip = kwds.pop('is_mip', False)
#
# Define valid problem formats and associated results formats
#
self._valid_problem_formats = [ProblemFormat.cpxlp, ProblemFormat.mps]
self._valid_result_formats = {}
self._valid_result_formats[ProblemFormat.cpxlp] = [ResultsFormat.soln]
self._valid_result_formats[ProblemFormat.mps] = [ResultsFormat.soln]
self.set_problem_format(ProblemFormat.cpxlp)
#
# Cache the problem type - LP or MIP. Xpress needs to know this
# on the command-line, and it matters when reading the solution file.
#
# Note: Undefined capabilities default to 'None'
self._capabilities = Bunch()
self._capabilities.linear = True
self._capabilities.quadratic_objective = True
self._capabilities.quadratic_constraint = True
self._capabilities.integer = True
self._capabilities.sos1 = True
self._capabilities.sos2 = True