X-Git-Url: https://scm.cri.ensmp.fr/git/linpy.git/blobdiff_plain/23787dd83c4990ca14e52ce3ddff256e26397cdc..6a1d02bd5c59e77c8333ccb4b54d6d2025c493ca:/pypol/linear.py?ds=sidebyside diff --git a/pypol/linear.py b/pypol/linear.py index d1aa882..348294c 100644 --- a/pypol/linear.py +++ b/pypol/linear.py @@ -1,17 +1,12 @@ -''' -VERY MESSY, made notes on where I will change things -''' - +import ctypes, ctypes.util import functools import numbers -import ctypes, ctypes.util -from pypol import isl from fractions import Fraction, gcd -libisl = ctypes.CDLL(ctypes.util.find_library('isl')) +from . import isl, islhelper +from .isl import libisl, Context, BasicSet -libisl.isl_printer_get_str.restype = ctypes.c_char_p __all__ = [ 'Expression', @@ -22,8 +17,6 @@ __all__ = [ ] -_CONTEXT = isl.Context() - def _polymorphic_method(func): @functools.wraps(func) def wrapper(a, b): @@ -98,6 +91,7 @@ class Expression: __getitem__ = coefficient + @property def coefficients(self): for symbol in self.symbols(): yield symbol, self.coefficient(symbol) @@ -119,7 +113,6 @@ class Expression: return self.coefficient(symbol) return int(self.constant) - def symbol(self): if not self.issymbol(): raise ValueError('not a symbol: {}'.format(self)) @@ -140,8 +133,8 @@ class Expression: @_polymorphic_method def __add__(self, other): - coefficients = dict(self.coefficients()) - for symbol, coefficient in other.coefficients(): + coefficients = dict(self.coefficients) + for symbol, coefficient in other.coefficients: if symbol in coefficients: coefficients[symbol] += coefficient else: @@ -153,8 +146,8 @@ class Expression: @_polymorphic_method def __sub__(self, other): - coefficients = dict(self.coefficients()) - for symbol, coefficient in other.coefficients(): + coefficients = dict(self.coefficients) + for symbol, coefficient in other.coefficients: if symbol in coefficients: coefficients[symbol] -= coefficient else: @@ -162,12 +155,13 @@ class Expression: constant = self.constant - other.constant return Expression(coefficients, constant) - __rsub__ = __sub__ + def __rsub__(self, other): + return -(self - other) @_polymorphic_method def __mul__(self, other): if other.isconstant(): - coefficients = dict(self.coefficients()) + coefficients = dict(self.coefficients) for symbol in coefficients: coefficients[symbol] *= other.constant constant = self.constant * other.constant @@ -250,7 +244,7 @@ class Expression: def __repr__(self): string = '{}({{'.format(self.__class__.__name__) - for i, (symbol, coefficient) in enumerate(self.coefficients()): + for i, (symbol, coefficient) in enumerate(self.coefficients): if i != 0: string += ', ' string += '{!r}: {!r}'.format(symbol, coefficient) @@ -283,19 +277,19 @@ class Expression: @_polymorphic_method def __le__(self, other): - return Polyhedron(inequalities=[(self - other)._canonify()]) + return Polyhedron(inequalities=[(other - self)._canonify()]) @_polymorphic_method def __lt__(self, other): - return Polyhedron(inequalities=[(self - other)._canonify() + 1]) + return Polyhedron(inequalities=[(other - self)._canonify() - 1]) @_polymorphic_method def __ge__(self, other): - return Polyhedron(inequalities=[(other - self)._canonify()]) + return Polyhedron(inequalities=[(self - other)._canonify()]) @_polymorphic_method def __gt__(self, other): - return Polyhedron(inequalities=[(other - self)._canonify() + 1]) + return Polyhedron(inequalities=[(self - other)._canonify() - 1]) def constant(numerator=0, denominator=None): @@ -362,14 +356,9 @@ class Polyhedron: if value.denominator != 1: raise TypeError('non-integer constraint: ' '{} <= 0'.format(constraint)) - self._inequalities.append(constraint) - print('in polyhedron') - #print(self.constraints()) - self._bset = self.to_isl() - #print(self._bset) - return self - - + self._inequalities.append(constraint) + return self + @property def equalities(self): yield from self._equalities @@ -377,15 +366,14 @@ class Polyhedron: @property def inequalities(self): yield from self._inequalities - + @property def constant(self): return self._constant def isconstant(self): return len(self._coefficients) == 0 - - + def isempty(self): return bool(libisl.isl_basic_set_is_empty(self._bset)) @@ -393,19 +381,12 @@ class Polyhedron: yield from self.equalities yield from self.inequalities - def symbols(self): s = set() for constraint in self.constraints(): - s.update(constraint.symbols) - yield from sorted(s) - - def symbol_count(self): - s = [] - for constraint in self.constraints(): - s.append(constraint.symbols) - return s - + s.update(constraint.symbols()) + return sorted(s) + @property def dimension(self): return len(self.symbols()) @@ -416,7 +397,6 @@ class Polyhedron: return False else: return True - def __contains__(self, value): # is the value in the polyhedron? @@ -448,9 +428,9 @@ class Polyhedron: # test whether every element in other is in the polyhedron for value in other: if value == self.constraints(): - return True + return True else: - return False + return False raise NotImplementedError def __ge__(self, other): @@ -495,7 +475,7 @@ class Polyhedron: for constraint in self.equalities: constraints.append('{} == 0'.format(constraint)) for constraint in self.inequalities: - constraints.append('{} <= 0'.format(constraint)) + constraints.append('{} >= 0'.format(constraint)) return '{{{}}}'.format(', '.join(constraints)) def __repr__(self): @@ -507,36 +487,69 @@ class Polyhedron: @classmethod def fromstring(cls, string): raise NotImplementedError - - def to_isl(self): - space = libisl.isl_space_set_alloc(_CONTEXT, 0, len(self.symbol_count())) + + def _symbolunion(self, *others): + symbols = set(self.symbols()) + for other in others: + symbols.update(other.symbols()) + return sorted(symbols) + + def _to_isl(self, symbols=None): + if symbols is None: + symbols = self.symbols() + num_coefficients = len(symbols) + ctx = Context() + space = libisl.isl_space_set_alloc(ctx, 0, num_coefficients) bset = libisl.isl_basic_set_universe(libisl.isl_space_copy(space)) - copy = libisl.isl_basic_set_copy(bset) - ls = libisl.isl_local_space_from_space(libisl.isl_space_copy(space)) + ls = libisl.isl_local_space_from_space(space) ceq = libisl.isl_equality_alloc(libisl.isl_local_space_copy(ls)) - for value in self.equalities: - for value in self.equalities: - #need method to get expression value - if self._equalities: - value = self._equalities.method_get_value_from_expression() - ceq = libisl.isl_constraint_set_constant_val(ceq, value ) - #ceq = libisl.isl_constraint_set_coefficient_si(ceq, libisl.isl_set_dim, self.symbols(), value) - ''' cin = libisl.isl_inequality_alloc(libisl.isl_local_space_copy(ls)) - for item in self.inequalities: - for item in self.inequalities: - if isinstance(item, int): - cin = libisl.isl_constraint_set_constant_si(cin, item) - else: - cin = libisl.isl_constraint_set_coefficient_si(cin, libisl.isl_set_dim, self.symbols(), item) - ''' - bsetfinal = libisl.isl_basic_set_add_contraint(copy, ceq) - #bsetfinal = libisl.isl_basic_set_add_contraint(copy, cin) - string = libisl.isl_printer_print_basic_set(bsetfinal) - print(string) - return self - -empty = eq(1, 1) - - -universe = Polyhedron() + '''if there are equalities/inequalities, take each constant and coefficient and add as a constraint to the basic set''' + if list(self.equalities): #check if any equalities exist + for eq in self.equalities: + coeff_eq = dict(eq.coefficients) + if eq.constant: + value = eq.constant + ceq = libisl.isl_constraint_set_constant_si(ceq, value) + for eq in coeff_eq: + num = coeff_eq.get(eq) + iden = symbols.index(eq) + ceq = libisl.isl_constraint_set_coefficient_si(ceq, islhelper.isl_dim_set, iden, num) #use 3 for type isl_dim_set + bset = libisl.isl_basic_set_add_constraint(bset, ceq) + if list(self.inequalities): #check if any inequalities exist + for ineq in self.inequalities: + coeff_in = dict(ineq.coefficients) + if ineq.constant: + value = ineq.constant + cin = libisl.isl_constraint_set_constant_si(cin, value) + for ineq in coeff_in: + num = coeff_in.get(ineq) + iden = symbols.index(ineq) + cin = libisl.isl_constraint_set_coefficient_si(cin, islhelper.isl_dim_set, iden, num) #use 3 for type isl_dim_set + bset = libisl.isl_basic_set_add_constraint(bset, cin) + bset = BasicSet(bset) + return bset + + def from_isl(self, bset): + '''takes basic set in isl form and puts back into python version of polyhedron + isl example code gives isl form as: + "{[i] : exists (a : i = 2a and i >= 10 and i <= 42)}") + our printer is giving form as: + b'{ [i0] : 1 = 0 }' ''' + #bset = self + if self._equalities: + constraints = libisl.isl_basic_set_equalities_matrix(bset, 3) + elif self._inequalities: + constraints = libisl.isl_basic_set_inequalities_matrix(bset, 3) + print(constraints) + return constraints + +empty = None #eq(0,1) +universe = None #Polyhedron() + +if __name__ == '__main__': + ex1 = Expression(coefficients={'a': 1, 'x': 2}, constant=2) + ex2 = Expression(coefficients={'a': 3 , 'b': 2}, constant=3) + p = Polyhedron(inequalities=[ex1, ex2]) + bs = p._to_isl() + print(bs)