def exportToMPS(self, filename, format='fixed', startIndex=0):
try:
from lp_solve import lpsolve
except ImportError:
self.err(
'To export LP/MILP in files you should have lpsolve and its Python binding properly installed'
)
maxNameLength = 8 if format != 'free' else 255
handler = self.get_lpsolve_handler(maxNameLength, startIndex)
# TODO: uncomment it
ext = 'mps' if not filename.endswith('MPS') and not filename.endswith(
'mps') else ''
if ext != '': filename += '.' + ext
if format == 'fixed':
r = bool(lpsolve('write_mps', handler, filename))
elif format == 'free':
r = bool(lpsolve('write_freemps', handler, filename))
else:
self.err('incorrect MPS format, should be "fixed" or "free"')
if r != True:
self.warn(
'Failed to write MPS file, maybe read-only filesystem, incorrect path or write access is absent'
)
lpsolve('delete_lp', handler)
return r
def reset(self):
self.__resetcalls = self.__resetcalls + 1
start = time.process_time()
n = len(self.__clist)
if n > 0:
while n != 0:
lpsolve('del_constraint', self.__solver_obj, 1)
n -= 1
self.__clist = [] # [({varname : weight}, rel, b)]
self.__obj = {} # {varname : weight}
self.__resettime = self.__resettime + time.process_time() - start
def set_doms(self):
''' expects doms = {varname : [(lb,ub)]}
'''
for varname in self.__doms:
if varname in self.__var_mapping:
for dom in self.__doms[varname]:
lb = dom[0]
ub = dom[1]
if lb != 'none':
lpsolve('set_lowbo', self.__solver_obj,
self.__var_mapping[varname], lb)
if ub != 'none':
lpsolve('set_upbo', self.__solver_obj,
self.__var_mapping[varname], ub)
def add_constr(self, clist):
''' expects clist = [({varname : weight}, rel, b)]
'''
self.__addcalls = self.__addcalls + 1
start = time.process_time()
self.__clist.extend(clist)
nvar = len(self.__var_mapping)
for constr in clist:
tmp = [0] * nvar
for varname in constr[0]:
tmp[self.__var_mapping[varname] - 1] = constr[0][varname]
lpsolve('add_constraint', self.__solver_obj, tmp, constr[1],
constr[2])
self.__addtime = self.__addtime + time.process_time() - start
def is_valid(self):
if self.__clist == []:
return False
status = lpsolve('get_status', self.__solver_obj)
if status in [0, 1, 2, 3, 4]:
return True
return False
def get_lpsolve_handler(self, maxNameLength=255, startIndex=0):
try: from lp_maker import lp_maker, lpsolve
except ImportError: self.err('To export LP/MILP in files you should have lpsolve and its Python binding properly installed')
self._Prepare()
from ooMisc import LinConst2WholeRepr
LinConst2WholeRepr(self)
# set goal to min/max
minim = 0 if self.goal in ['max', 'maximum'] else 1
# objective
f = self._init_f_vector
lp_handle = lp_maker(List(asarray(f).flatten()), List(self.Awhole), List(asarray(self.bwhole).flatten()), List(asarray(self.dwhole).flatten()), \
List(self.lb), List(self.ub), (1+asarray(self._intVars_vector)).tolist(), 0,minim)
#lp_handle = lpsolve('make_lp', len(self.beq)+len(self.b), self.n)
L = lambda action, *args: lpsolve(action, lp_handle, *args)
# set name
L('set_lp_name', self.name)
# set boolean values if present
#if len(self.boolVars)>0:
#assert self.boolVars[0] in [True, False]
#L('set_binary', self.boolVars)
# set variables names
if self.isFDmodel:
assert not isinstance(self.freeVars, set), 'error in openopt kernel, inform developers'
#assert len(self.freeVars) == self.n, 'not implemented yet for oovars of size > 1'
#names = [oov.name for oov in self.freeVars]
x0 = self._x0
names = []
#assert not isinstance(self.freeVars, set), 'error in openopt kernel, inform developers'
for oov in self.freeVars:
if oov.name.startswith('unnamed'):
L('delete_lp')
self.err('For exporting FuncDesigner models into MPS files you cannot have variables with names starting with "unnamed"')
if ' ' in oov.name:
L('delete_lp')
self.err('For exporting FuncDesigner models into MPS files you cannot have variables with spaces in names')
Size = asarray(x0[oov]).size
if Size == 1:
Name = oov.name
names.append(Name)
else:
tmp = [(oov.name + ('_%d' % (startIndex+j))) for j in range(Size)]
names += tmp
Name = tmp[-1]
if maxNameLength < len(Name):
L('delete_lp')
self.err('incorrect name "%s" - for exporting FuncDesigner models into MPS files you cannot have variables with names of length > maxNameLength=%d'% maxNameLength)
# TODO: check are names unique
L('set_col_name', names)
return lp_handle
def __init__(self, mapping, doms, ilp):
self.__var_mapping = {} # {varname : position}
self.__doms = doms # {varname : [(lb,ub)]}
self.__clist = [] # [({varname : weight}, rel, b)]
self.__obj = {} # {varname : weight}
self.__stime = 0.0
self.__scalls = 0
self.__addtime = 0.0
self.__addcalls = 0
self.__resettime = 0.0
self.__resetcalls = 0
self.__mode = ''
self.set_mapping(mapping)
nvar = len(self.__var_mapping)
self.__solver_obj = lpsolve('make_lp', 0, nvar)
lpsolve('set_verbose', self.__solver_obj, lp_solve.IMPORTANT)
self.set_doms()
if ilp:
self.set_ilp()
def exportToMPS(self, filename, format='fixed', startIndex=0):
try: from lp_solve import lpsolve
except ImportError: self.err('To export LP/MILP in files you should have lpsolve and its Python binding properly installed')
maxNameLength = 8 if format != 'free' else 255
handler = self.get_lpsolve_handler(maxNameLength, startIndex)
# TODO: uncomment it
ext = 'mps' if not filename.endswith('MPS') and not filename.endswith('mps') else ''
if ext != '': filename += '.' + ext
if format=='fixed':
r = bool(lpsolve('write_mps', handler, filename) )
elif format=='free':
r = bool(lpsolve('write_freemps', handler, filename) )
else:
self.err('incorrect MPS format, should be "fixed" or "free"')
if r != True:
self.warn('Failed to write MPS file, maybe read-only filesystem, incorrect path or write access is absent')
lpsolve('delete_lp', handler)
return r
def get_solution(self, accuracy):
if self.is_sat():
sdict = {}
slist = []
res = lpsolve('get_variables', self.__solver_obj)[0]
if isinstance(res, float):
slist.append(res)
else:
slist.extend(res)
obj = lpsolve('get_objective', self.__solver_obj)
if accuracy > 0 and accuracy < 15:
for var in self.__var_mapping:
sdict[var] = round(slist[self.__var_mapping[var] - 1],
accuracy)
else:
for var in self.__var_mapping:
sdict[var] = round(
round(slist[self.__var_mapping[var] - 1], 1), 0)
slist = (obj, sdict)
elif self.is_sat() is None:
slist = 'Error'
else:
slist = 'Unsat'
return slist
def set_obj(self, wopt, mode):
''' expects wopt = {varname : weights}; mode = max/min
'''
self.__obj = dict(wopt)
self.__mode = mode
if mode == 'max':
lpsolve('set_maxim', self.__solver_obj)
else:
if mode != 'min':
self.__mode = 'default min'
lpsolve('set_minim', self.__solver_obj)
tmp = [0] * len(self.__var_mapping)
for varname in wopt:
tmp[self.__var_mapping[varname] - 1] = wopt[varname]
lpsolve('set_obj_fn', self.__solver_obj, tmp)
def get_lpsolve_handler(self, maxNameLength=255, startIndex=0):
try:
from lp_maker import lp_maker, lpsolve
except ImportError:
self.err(
'To export LP/MILP in files you should have lpsolve and its Python binding properly installed'
)
self._Prepare()
from ooMisc import LinConst2WholeRepr
LinConst2WholeRepr(self)
# set goal to min/max
minim = 0 if self.goal in ['max', 'maximum'] else 1
# objective
f = self._init_f_vector
lp_handle = lp_maker(List(asarray(f).flatten()), List(self.Awhole), List(asarray(self.bwhole).flatten()), List(asarray(self.dwhole).flatten()), \
List(self.lb), List(self.ub), (1+asarray(self._intVars_vector)).tolist(), 0,minim)
#lp_handle = lpsolve('make_lp', len(self.beq)+len(self.b), self.n)
L = lambda action, *args: lpsolve(action, lp_handle, *args)
# set name
L('set_lp_name', self.name)
# set boolean values if present
#if len(self.boolVars)>0:
#assert self.boolVars[0] in [True, False]
#L('set_binary', self.boolVars)
# set variables names
if self.isFDmodel:
assert not isinstance(
self.freeVars,
set), 'error in openopt kernel, inform developers'
#assert len(self.freeVars) == self.n, 'not implemented yet for oovars of size > 1'
#names = [oov.name for oov in self.freeVars]
x0 = self._x0
names = []
#assert not isinstance(self.freeVars, set), 'error in openopt kernel, inform developers'
for oov in self.freeVars:
if oov.name.startswith('unnamed'):
L('delete_lp')
self.err(
'For exporting FuncDesigner models into MPS files you cannot have variables with names starting with "unnamed"'
)
if ' ' in oov.name:
L('delete_lp')
self.err(
'For exporting FuncDesigner models into MPS files you cannot have variables with spaces in names'
)
Size = asarray(x0[oov]).size
if Size == 1:
Name = oov.name
names.append(Name)
else:
tmp = [(oov.name + ('_%d' % (startIndex + j)))
for j in range(Size)]
names += tmp
Name = tmp[-1]
if maxNameLength < len(Name):
L('delete_lp')
self.err(
'incorrect name "%s" - for exporting FuncDesigner models into MPS files you cannot have variables with names of length > maxNameLength=%d'
% maxNameLength)
# TODO: check are names unique
L('set_col_name', names)
return lp_handle
def is_sat(self):
status = lpsolve('get_status', self.__solver_obj)
if status in [0, 1, 3]:
return True
elif status == 2:
return False
def solve_lp(self):
self.__scalls = self.__scalls + 1
start = time.process_time()
lpsolve('solve', self.__solver_obj)
self.__stime = self.__stime + time.process_time() - start
def set_ilp(self):
for i in range(len(self.__var_mapping)):
lpsolve('set_int', self.__solver_obj, i + 1, 1)
