Python ExprEvaluator.check_resolve方法代码示例

# 需要导入模块: from openmdao.main.expreval import ExprEvaluator [as 别名]
# 或者: from openmdao.main.expreval.ExprEvaluator import check_resolve [as 别名]
 def test_resolve(self):
     ex = ExprEvaluator('comp.x[0] = 10*(3.2+ a.a1d[3]* 1.1*a.a1d[2 ])', self.top)
     self.assertEqual(ex.check_resolve(), True)
     ex.text = 'comp.contlist[1].a2d[2][1]'
     self.assertEqual(ex.check_resolve(), True)
     ex.scope = self.top.comp
     ex.text = 'contlist[1]'
     self.assertEqual(ex.check_resolve(), True)
     ex.text = 'contlist[1]-foo.flambe'
     self.assertEqual(ex.check_resolve(), False)

# 需要导入模块: from openmdao.main.expreval import ExprEvaluator [as 别名]
# 或者: from openmdao.main.expreval.ExprEvaluator import check_resolve [as 别名]
class Constraint(object):
    """ Object that stores info for a single constraint. """
    
    def __init__(self, lhs, comparator, rhs, scaler, adder, scope=None):
        self.lhs = ExprEvaluator(lhs, scope=scope)
        if not self.lhs.check_resolve():
            raise ValueError("Constraint '%s' has an invalid left-hand-side." \
                              % ' '.join([lhs, comparator, rhs]))
        self.comparator = comparator
        self.rhs = ExprEvaluator(rhs, scope=scope)
        if not self.rhs.check_resolve():
            raise ValueError("Constraint '%s' has an invalid right-hand-side." \
                              % ' '.join([lhs, comparator, rhs]))
        
        if not isinstance(scaler, float):
            raise ValueError("Scaler parameter should be a float")
        self.scaler = scaler
        
        if scaler <= 0.0:
            raise ValueError("Scaler parameter should be a float > 0")
        
        if not isinstance(adder, float):
            raise ValueError("Adder parameter should be a float")
        self.adder = adder
        
    def evaluate(self, scope):
        """Returns a tuple of the form (lhs, rhs, comparator, is_violated)."""
        
        lhs = (self.lhs.evaluate(scope) + self.adder)*self.scaler
        rhs = (self.rhs.evaluate(scope) + self.adder)*self.scaler
        return (lhs, rhs, self.comparator, not _ops[self.comparator](lhs, rhs))
        
    def evaluate_gradient(self, scope, stepsize=1.0e-6, wrt=None):
        """Returns the gradient of the constraint eq/inep as a tuple of the
        form (lhs, rhs, comparator, is_violated)."""
        
        lhs = self.lhs.evaluate_gradient(scope=scope, stepsize=stepsize, wrt=wrt)
        for key, value in lhs.iteritems():
            lhs[key] = (value + self.adder)*self.scaler
            
        rhs = self.rhs.evaluate_gradient(scope=scope, stepsize=stepsize, wrt=wrt)
        for key, value in rhs.iteritems():
            rhs[key] = (value + self.adder)*self.scaler
            
        return (lhs, rhs, self.comparator, not _ops[self.comparator](lhs, rhs))
        
    def get_referenced_compnames(self):
        return self.lhs.get_referenced_compnames().union(self.rhs.get_referenced_compnames())

    def __str__(self):
        return ' '.join([self.lhs.text, self.comparator, self.rhs.text])

# 需要导入模块: from openmdao.main.expreval import ExprEvaluator [as 别名]
# 或者: from openmdao.main.expreval.ExprEvaluator import check_resolve [as 别名]
    def add_objective(self, expr, name=None, scope=None):
        """Adds an objective to the driver. 
        
        expr: string
            String containing the objective expression.
            
        name: string (optional)
            Name to be used to refer to the objective in place of the expression
            string.
            
        scope: object (optional)
            The object to be used as the scope when evaluating the expression.

         """
        if self._max_objectives > 0 and len(self._objectives) >= self._max_objectives:
            self._parent.raise_exception("Can't add objective '%s'. Only %d objectives are allowed" % (expr,self._max_objectives),
                                         RuntimeError)
        expr = _remove_spaces(expr)
        if expr in self._objectives: 
            self._parent.raise_exception("Trying to add objective "
                                         "'%s' to driver, but it's already there" % expr,
                                         AttributeError)
        if name is not None and name in self._objectives:
            self._parent.raise_exception("Trying to add objective "
                                         "'%s' to driver using name '%s', but name is already used" % (expr,name),
                                         AttributeError)
            
        expreval = ExprEvaluator(expr, self._get_scope(scope))
        
        if not expreval.check_resolve():
            self._parent.raise_exception("Can't add objective because I can't evaluate '%s'." % expr, 
                                         ValueError)
            
        if name is None:
            self._objectives[expr] = expreval
        else:
            self._objectives[name] = expreval
            
        self._parent._invalidate()

# 需要导入模块: from openmdao.main.expreval import ExprEvaluator [as 别名]
# 或者: from openmdao.main.expreval.ExprEvaluator import check_resolve [as 别名]

#.........这里部分代码省略.........
        else:
            first = self.lhs.text
            second = self.rhs.text

        first_zero = False
        try:
            f = float(first)
        except Exception:
            pass
        else:
            if f == 0:
                first_zero = True

        second_zero = False
        try:
            f = float(second)
        except Exception:
            pass
        else:
            if f == 0:
                second_zero = True

        if first_zero:
            newexpr = "-(%s)" % second
        elif second_zero:
            newexpr = first
        else:
            newexpr = '%s-(%s)' % (first, second)

        return ExprEvaluator(newexpr, scope)

    def copy(self):
        """ Returns a copy of our self. """
        return Constraint(str(self.lhs), self.comparator, str(self.rhs),
                          scope=self.lhs.scope, jacs=self.jacs)

    def evaluate(self, scope):
        """Returns the value of the constraint as a sequence."""
        vname = self.pcomp_name + '.out0'
        try:
            system = getattr(scope,self.pcomp_name)._system
            info = system.vec['u']._info[scope.name2collapsed[vname]]
            # if a pseudocomp output is marked as hidden, that means that
            # it's really a residual, but it's mapped in the vector to
            # the corresponding state, so don't pull that value because
            # we want the actual residual value
            if info.hide: # it's a residual so pull from f vector
                return -system.vec['f'][scope.name2collapsed[vname]]
            else:
                return info.view
        except (KeyError, AttributeError):
            pass

        val = getattr(scope, self.pcomp_name).out0

        if isinstance(val, ndarray):
            return val.flatten()
        else:
            return [val]

    def get_referenced_compnames(self):
        """Returns a set of names of each component referenced by this
        constraint.
        """
        if isinstance(self.rhs, float):
            return self.lhs.get_referenced_compnames()
        else:
            return self.lhs.get_referenced_compnames().union(
                                            self.rhs.get_referenced_compnames())

    def get_referenced_varpaths(self, copy=True, refs=False):
        """Returns a set of names of each component referenced by this
        constraint.
        """
        if isinstance(self.rhs, float):
            return self.lhs.get_referenced_varpaths(copy=copy, refs=refs)
        else:
            return self.lhs.get_referenced_varpaths(copy=copy, refs=refs).union(
                    self.rhs.get_referenced_varpaths(copy=copy, refs=refs))

    def check_resolve(self):
        """Returns True if this constraint has no unresolved references."""
        return self.lhs.check_resolve() and self.rhs.check_resolve()

    def get_unresolved(self):
        return list(set(self.lhs.get_unresolved()).union(self.rhs.get_unresolved()))

    def name_changed(self, old, new):
        """Update expressions if necessary when an object is renamed."""
        self.rhs.name_changed(old, new)
        self.lhs.name_changed(old, new)

    def __str__(self):
        return ' '.join((str(self.lhs), self.comparator, str(self.rhs)))

    def __eq__(self, other):
        if not isinstance(other, Constraint):
            return False
        return (self.lhs, self.comparator, self.rhs) == \
               (other.lhs, other.comparator, other.rhs)

# 需要导入模块: from openmdao.main.expreval import ExprEvaluator [as 别名]
# 或者: from openmdao.main.expreval.ExprEvaluator import check_resolve [as 别名]
class Constraint(object):
    """ Object that stores info for a single constraint. """

    def __init__(self, lhs, comparator, rhs, scope):
        self.lhs = ExprEvaluator(lhs, scope=scope)
        if not self.lhs.check_resolve():
            raise ValueError("Constraint '%s' has an invalid left-hand-side."
                              % ' '.join([lhs, comparator, rhs]))

        self.comparator = comparator

        self.rhs = ExprEvaluator(rhs, scope=scope)
        if not self.rhs.check_resolve():
            raise ValueError("Constraint '%s' has an invalid right-hand-side."
                              % ' '.join([lhs, comparator, rhs]))

        self.pcomp_name = None
        self._size = None

    @property
    def size(self):
        """Total scalar items in this constraint."""
        if self._size is None:
            self._size = len(self.evaluate(self.lhs.scope))
        return self._size

    def activate(self):
        """Make this constraint active by creating the appropriate
        connections in the dependency graph.
        """
        if self.pcomp_name is None:
            pseudo = PseudoComponent(self.lhs.scope, self._combined_expr(),
                                     pseudo_type='constraint')
            self.pcomp_name = pseudo.name
            self.lhs.scope.add(pseudo.name, pseudo)
        getattr(self.lhs.scope, pseudo.name).make_connections(self.lhs.scope)

    def deactivate(self):
        """Remove this constraint from the dependency graph and remove
        its pseudocomp from the scoping object.
        """
        if self.pcomp_name:
            scope = self.lhs.scope
            try:
                pcomp = getattr(scope, self.pcomp_name)
            except AttributeError:
                pass
            else:
                # pcomp.remove_connections(scope)
                # if hasattr(scope, pcomp.name):
                scope.remove(pcomp.name)
            finally:  
                self.pcomp_name = None

    def _combined_expr(self):
        """Given a constraint object, take the lhs, operator, and
        rhs and combine them into a single expression by moving rhs
        terms over to the lhs.  For example,
        for the constraint 'C1.x < C2.y + 7', return the expression
        'C1.x - C2.y - 7'.  Depending on the direction of the operator,
        the sign of the expression may be flipped.  The final form of
        the constraint, when evaluated, will be considered to be satisfied
        if it evaluates to a value <= 0.
        """
        scope = self.lhs.scope

        if self.comparator.startswith('>'):
            first = self.rhs.text
            second = self.lhs.text
        else:
            first = self.lhs.text
            second = self.rhs.text

        first_zero = False
        try:
            f = float(first)
        except Exception:
            pass
        else:
            if f == 0:
                first_zero = True

        second_zero = False
        try:
            f = float(second)
        except Exception:
            pass
        else:
            if f == 0:
                second_zero = True

        if first_zero:
            newexpr = "-(%s)" % second
        elif second_zero:
            newexpr = "%s" % first
        else:
            newexpr = '%s-(%s)' % (first, second)

        return ExprEvaluator(newexpr, scope)

#.........这里部分代码省略.........