def elaborate_Gelpia_error_intervals(self, constraints, symbolic_affine):
results = {}
logging_constraints = []
prob = constraints_probabilities
#constraint_dict = {}
#for constraint in constraints:
# values=constraints[constraint][prob]
# constraint_dict[str(constraint)]=[values[0], values[1]]
second_order_lower, second_order_upper = \
SymbolicToGelpia(symbolic_affine.center, symbolic_affine.variables, constraints=constraints). \
compute_concrete_bounds(debug=True, zero_output_epsilon=True)
center_interval = Interval(second_order_lower, second_order_upper,
True, True, digits_for_range)
#concrete_symbolic_interval = symbolic_affine.compute_interval_error(center_interval)
#results["1"] = Interval(str(concrete_symbolic_interval.lower),
# str(concrete_symbolic_interval.upper),
# True,True,digits_for_range)
print("Error for prob: " + str(prob))
logging_constraints.append((prob, constraints))
constraints_interval = symbolic_affine.compute_interval_error(
center_interval, constraints=constraints)
results[str(prob)] = Interval(str(constraints_interval.lower),
str(constraints_interval.upper), True,
True, digits_for_range)
return results, logging_constraints
def subtraction(self, affine):
new_center = self.center.subtraction(affine.center)
new_coefficients = {}
keys = set().union(self.coefficients, affine.coefficients)
for key in keys:
res_int = self.coefficients.get(key, Interval("0","0", True, True, digits_for_range))\
.subtraction(affine.coefficients.get(key, Interval("0","0", True, True, digits_for_range)))
new_coefficients[key] = res_int
return AffineInstance(new_center, new_coefficients)
def check_expression_is_constant_zero(expression):
try:
interval = Interval(expression.value, expression.value, True, True,
digits_for_range)
return check_interval_is_zero(interval)
except:
return False
return False
def do_quantize(self, left_node, operator, right_node):
if (operator=="+" or operator=="-") and \
check_interval_is_zero(
Interval(left_node.discretization.intervals[0].interval.lower,
left_node.discretization.intervals[-1].interval.upper,
True, True, digits_for_range)):
return False
return True
def compute_interval(self):
self_coefficients = self.add_all_coefficients_abs_exact()
lower_expr = self.center.subtraction(self_coefficients)
upper_expr = self.center.addition(self_coefficients)
lower_concrete, _ = SymbolicToGelpia(
lower_expr, self.variables).compute_concrete_bounds()
_, upper_concrete = SymbolicToGelpia(
upper_expr, self.variables).compute_concrete_bounds()
return Interval(lower_concrete, upper_concrete, True, True,
digits_for_range)
def compute_interval(self):
with gmpy2.local_context(gmpy2.context(),
round=gmpy2.RoundDown,
precision=mpfr_proxy_precision) as ctx:
res_left = gmpy2.sub(mpfr(self.center.lower),
mpfr(self.add_all_coefficients_lower_abs()))
with gmpy2.local_context(gmpy2.context(),
round=gmpy2.RoundUp,
precision=mpfr_proxy_precision) as ctx:
res_right = gmpy2.add(mpfr(self.center.upper),
mpfr(self.add_all_coefficients_upper_abs()))
if res_left <= res_right:
return Interval(
round_number_down_to_digits(res_left, digits_for_range),
round_number_up_to_digits(res_right, digits_for_range), True,
True, digits_for_range)
else:
return Interval(
round_number_down_to_digits(res_right, digits_for_range),
round_number_up_to_digits(res_left, digits_for_range), True,
True, digits_for_range)
def round_value_to_interval(str_value):
with gmpy2.local_context(gmpy2.context(),
round=gmpy2.RoundDown,
precision=mpfr_proxy_precision) as ctx:
res_left = mpfr(str_value)
with gmpy2.local_context(gmpy2.context(),
round=gmpy2.RoundUp,
precision=mpfr_proxy_precision) as ctx:
res_right = mpfr(str_value)
return Interval(
round_number_down_to_digits(res_left, digits_for_range),
round_number_up_to_digits(res_right, digits_for_range), True, True,
digits_for_range)
def compute_middle_point_given_interval(low, upper):
with gmpy2.local_context(gmpy2.context(),
round=gmpy2.RoundDown,
precision=mpfr_proxy_precision) as ctx:
res_left = gmpy2.add(gmpy2.div(mpfr(upper), mpfr("2.0")),
gmpy2.div(mpfr(low), mpfr("2.0")))
with gmpy2.local_context(gmpy2.context(),
round=gmpy2.RoundUp,
precision=mpfr_proxy_precision) as ctx:
res_right = gmpy2.add(gmpy2.div(mpfr(upper), mpfr("2.0")),
gmpy2.div(mpfr(low), mpfr("2.0")))
return Interval(
round_number_down_to_digits(res_left, digits_for_range),
round_number_up_to_digits(res_right, digits_for_range), True, True,
digits_for_range)
def compute_interval_error(self, center_interval, constraints=None):
tmp_variables = copy.deepcopy(self.variables)
memorize_eps = Interval("-1.0", "1.0", True, True, digits_for_range)
for var in tmp_variables:
# for the moment there should be one
if "eps" in var:
memorize_eps = Interval(tmp_variables[var][0],
tmp_variables[var][1], True, True,
digits_for_range)
tmp_variables[var] = ["-1.0", "1.0"]
break
self_coefficients = self.add_all_coefficients_abs_exact()
_, coeff_upper = SymbolicToGelpia(self_coefficients, tmp_variables,
constraints).compute_concrete_bounds(
debug=True,
zero_output_epsilon=True)
coeff_interval=Interval("-"+coeff_upper,coeff_upper,True,True,digits_for_range).\
perform_interval_operation("*", memorize_eps)
lower_concrete = center_interval.perform_interval_operation(
"-", coeff_interval)
upper_concrete = center_interval.perform_interval_operation(
"+", coeff_interval)
return Interval(lower_concrete.lower, upper_concrete.upper, True, True,
digits_for_range)
def multiplication(self, affine, recursion_limit_for_pruning, dReal):
new_center = self.center.multiplication(affine.center)
new_coefficients = {}
keys = set().union(self.coefficients, affine.coefficients)
for key in keys:
second_term = affine.center.multiplication(
self.coefficients.get(
key, Interval("0", "0", True, True, digits_for_range)))
first_term = self.center.multiplication(
affine.coefficients.get(
key, Interval("0", "0", True, True, digits_for_range)))
res = first_term.addition(second_term)
new_coefficients[key] = res
self_non_linear = Interval(self.add_all_coefficients_lower_abs(),
self.add_all_coefficients_upper_abs(), True,
True, digits_for_range)
affine_non_linear = Interval(affine.add_all_coefficients_lower_abs(),
affine.add_all_coefficients_upper_abs(),
True, True, digits_for_range)
res = self_non_linear.multiplication(affine_non_linear)
value = find_max_abs_interval(res) #This MUST positive
negative_value = "-" + value
interval_value = Interval(negative_value, value, True, True,
digits_for_range)
if not check_interval_is_zero(interval_value):
low_value, up_value = clean_non_linearity_affine(
self.coefficients, affine.coefficients, interval_value,
recursion_limit_for_pruning, dReal)
middle_point_non_linear = AffineManager.compute_middle_point_given_interval(
low_value, up_value)
uncertainty_non_linear = AffineManager.compute_uncertainty_given_interval(
low_value, up_value)
new_center = new_center.addition(middle_point_non_linear)
new_coefficients.update(uncertainty_non_linear)
return AffineInstance(new_center, new_coefficients)
def compute_uncertainty_given_interval(low, upper):
coefficients = {}
with gmpy2.local_context(gmpy2.context(),
round=gmpy2.RoundDown,
precision=mpfr_proxy_precision) as ctx:
res_left = gmpy2.sub(gmpy2.div(mpfr(upper), mpfr("2.0")),
gmpy2.div(mpfr(low), mpfr("2.0")))
with gmpy2.local_context(gmpy2.context(),
round=gmpy2.RoundUp,
precision=mpfr_proxy_precision) as ctx:
res_right = gmpy2.sub(gmpy2.div(mpfr(upper), mpfr("2.0")),
gmpy2.div(mpfr(low), mpfr("2.0")))
coefficients[AffineManager.get_new_error_index()]=\
Interval(round_number_down_to_digits(res_left, digits_for_range),
round_number_up_to_digits(res_right, digits_for_range), True, True, digits_for_range)
return coefficients
def compute_non_linearity(self):
#tmp_variables=copy.deepcopy(self.variables)
#memorize_eps=Interval("-1.0","1.0",True,True,digits_for_range)
#for var in tmp_variables:
# # for the moment there should be one
# if "eps" in var:
# memorize_eps=Interval(tmp_variables[var][0], tmp_variables[var][1], True, True, digits_for_range)
# tmp_variables[var]=["-1.0","1.0"]
# break
_, coeff_upper = SymbolicToGelpia(
self.expression, self.variables,
self.constraints).compute_concrete_bounds(debug=True,
zero_output_epsilon=True)
interval = Interval("-" + coeff_upper, coeff_upper, True, True,
digits_for_range)
#lower_concrete=center_interval.perform_interval_operation("-", coeff_interval)
#upper_concrete=center_interval.perform_interval_operation("+", coeff_interval)
return interval
def createDSIfromDistribution(distribution, n=50):
#np.logspace(-9, 5, base=2, num=50) spacing should be done by powers of 2
if distribution.range_()[0]==0.0 and distribution.range_()[-1]==1.0 and use_powers_of_two_spacing:
lin_space = powers_of_two_spacing()
elif "FTE" in distribution.name and use_powers_of_two_spacing:
lin_space = powers_of_two_error(distribution.d.precision)
else:
lin_space = np.linspace(distribution.range_()[0], distribution.range_()[-1], num=n + 1, endpoint=True)
if custom_spacing:
try:
lin_space = distribution.get_my_spacing()
except:
lin_space = np.linspace(distribution.range_()[0], distribution.range_()[-1], num=n + 1, endpoint=True)
cdf_distr=distribution.get_piecewise_cdf()
ret_list=[]
for i in range(0, len(lin_space)-1):
with gmpy2.local_context(gmpy2.context(), round=gmpy2.RoundDown, precision=mpfr_proxy_precision) as ctx:
lower=round_number_down_to_digits(gmpy2.mpfr(lin_space[i]), digits_for_input_discretization)
with gmpy2.local_context(gmpy2.context(), round=gmpy2.RoundUp, precision=mpfr_proxy_precision) as ctx:
upper=round_number_up_to_digits(gmpy2.mpfr(lin_space[i+1]), digits_for_input_discretization)
cdf_low_bound=min(1.0, max(0.0, cdf_distr(float(lin_space[i]))))
cdf_up_bound=min(1.0, max(0.0, cdf_distr(float(lin_space[i+1]))))
cdf_low_string=dec2Str(round_near(cdf_low_bound, digits_for_input_cdf))
cdf_up_string=dec2Str(round_near(cdf_up_bound, digits_for_input_cdf))
pbox = PBox(Interval(lower, upper, True, False, digits_for_range),
cdf_low_string, cdf_up_string)
ret_list.append(pbox)
ret_list=adjust_ret_list(ret_list)
with gmpy2.local_context(gmpy2.context(), round=gmpy2.RoundDown, precision=mpfr_proxy_precision) as ctx:
ret_list[0].interval.lower = \
round_number_down_to_digits(gmpy2.mpfr(distribution.a_real), digits_for_input_discretization)
with gmpy2.local_context(gmpy2.context(), round=gmpy2.RoundUp, precision=mpfr_proxy_precision) as ctx:
ret_list[-1].interval.upper = \
round_number_up_to_digits(gmpy2.mpfr(distribution.b_real), digits_for_input_discretization)
ret_list[-1].interval.include_upper = True
mixarith=MixedArithmetic(ret_list[0].interval.lower,ret_list[-1].interval.upper,ret_list)
return mixarith
def precise_create_exp_for_Gelpia(exact, error,
real_precision_constraints):
second_order_lower, second_order_upper = \
SymbolicToGelpia(error.center, error.variables, real_precision_constraints). \
compute_concrete_bounds(debug=True, zero_output_epsilon=True)
center_interval = Interval(second_order_lower, second_order_upper,
True, True, digits_for_range)
err_interval = error.compute_interval_error(
center_interval, constraints=real_precision_constraints)
new_exact = copy.deepcopy(exact)
if not check_interval_is_zero(err_interval):
err_expression = SymbolicAffineManager.from_Interval_to_Expression(
err_interval)
new_exact = new_exact.add_constant_expression(err_expression)
#The exact form has only a center (no error terms)
encoding = "(" + GELPHIA_exponent_function_name + "(" + str(
new_exact.center) + "))"
return SymbolicAffineInstance(SymExpression(encoding), {},
copy.deepcopy(exact.variables))
def create_discretization(self):
lower = self.wrapperInputDistribution.discretization.intervals[
0].interval.lower
upper = self.wrapperInputDistribution.discretization.intervals[
-1].interval.upper
with gmpy2.local_context(
set_context_precision(self.precision, self.exp),
round=(gmpy2.RoundDown if not round_constants_to_nearest else
gmpy2.RoundToNearest)) as ctx:
lower = round_number_down_to_digits(mpfr(lower), digits_for_range)
with gmpy2.local_context(
set_context_precision(self.precision, self.exp),
round=(gmpy2.RoundUp if not round_constants_to_nearest else
gmpy2.RoundToNearest)) as ctx:
upper = round_number_up_to_digits(mpfr(upper), digits_for_range)
#The following somehow remind of a dirac distribution.
return MixedArithmetic(lower, upper, [
PBox(Interval(lower, upper, True, True, digits_for_range), "0.0",
"1.0")
])
def inverse(self):
self_interval = self.compute_interval()
new_coefficients = copy.deepcopy(self.coefficients)
if Decimal(self_interval.lower) <= Decimal("0.0") <= Decimal(
self_interval.upper):
print("Division By Zero")
exit(-1)
min_a = find_min_abs_interval(self_interval)
a = Interval(min_a, min_a, True, True, digits_for_range)
max_b = find_max_abs_interval(self_interval)
b = Interval(max_b, max_b, True, True, digits_for_range)
b_square = b.perform_interval_operation("*", b)
alpha = Interval("-1.0", "-1.0", True, True,
digits_for_range).perform_interval_operation(
"/", b_square)
tmp_a = Interval("1.0", "1.0", True, True,
digits_for_range).perform_interval_operation("/", a)
d_max = tmp_a.perform_interval_operation(
"-", alpha.perform_interval_operation("*", a))
tmp_b = Interval("1.0", "1.0", True, True,
digits_for_range).perform_interval_operation("/", b)
d_min = tmp_b.perform_interval_operation(
"-", alpha.perform_interval_operation("*", b))
shift = AffineManager.compute_middle_point_given_interval(
d_min.lower, d_max.upper)
if Decimal(self_interval.lower) < Decimal("0.0"):
shift = shift.multiplication(
Interval("-1.0", "-1.0", True, True, digits_for_range))
#Error of the approximation with min-range
#radius=AffineManager.compute_uncertainty_given_interval(d_min, d_max)
radius = AffineManager.compute_uncertainty_given_interval(
d_min.lower, d_max.upper)
#####
res = AffineInstance(self.center, new_coefficients)
res = res.mult_interval(alpha)
res = res.add_constant_interval(shift)
#The err radius is not shifted or scaled by shift and alpha
#err_radius=AffineManager.get_new_error_index()
res.coefficients.update(radius)
res.update_interval()
#res.coefficients[err_radius]=radius
return res
def sum_cdfs(self, pbox):
tmp=Interval(self.cdf_low, self.cdf_up, True, True)\
.addition(Interval(pbox.cdf_low, pbox.cdf_up, True, True))
return PBox(None, tmp.lower, tmp.upper)
def from_DSI_to_PBox(edges_lower, values_lower, edges_upper, values_upper):
edges_lower=convertListToDecimals(edges_lower)
values_lower=convertListToDecimals(values_lower)
edges_upper=convertListToDecimals(edges_upper)
values_upper=convertListToDecimals(values_upper)
#plot_operation(edges_lower,values_lower,values_upper)
ret_list=[]
if not edges_lower==edges_upper:
print("Lists should be identical")
exit(-1)
pair_values_lower=createPairsFromBounds(values_lower)
pair_values_upper=createPairsFromBounds(values_upper)
for pair_value_upper in pair_values_upper:
index = bisect.bisect_left(values_lower, pair_value_upper[0])
pair_value_upper[1] = True
#in case we go out of bounds we take the last one
if index==len(values_lower):
index=index-1
#the lower bound of the forward box is the one before the current box
lower_index=pair_value_upper[2]
if lower_index==0:
ret_list.append(PBox(Interval(dec2Str(edges_lower[lower_index]), dec2Str(edges_lower[index]),
True, False, digits_for_range), "", dec2Str(pair_value_upper[0])))
else:
lower_index=lower_index-1
ret_list.append(PBox(Interval(dec2Str(edges_lower[lower_index]), dec2Str(edges_lower[index]),
False, False, digits_for_range), "", dec2Str(pair_value_upper[0])))
for pair_value_lower in pair_values_lower:
index = bisect.bisect_left(values_upper, pair_value_lower[0])
pair_value_lower[1] = True
if index==len(values_upper):
index=index-1
if index==pair_value_lower[2]:
index=index-1
ret_list.append(PBox(Interval(dec2Str(edges_lower[index]), dec2Str(edges_lower[pair_value_lower[2]]),
False, False, digits_for_range), "", dec2Str(pair_value_lower[0])))
continue
if index>0:
index = index - 1
ret_list.append(PBox(Interval(dec2Str(edges_lower[index]), dec2Str(edges_lower[pair_value_lower[2]]),
False, False, digits_for_range), "", dec2Str(pair_value_lower[0])))
continue
ret_list.append(PBox(Interval(dec2Str(edges_lower[index]), dec2Str(edges_lower[pair_value_lower[2]]),
True, False, digits_for_range), "", dec2Str(pair_value_lower[0])))
#sort by cdf, in case they are equal sort by lower bound
ret_list.sort(key=lambda x: (float(x.cdf_up), float(x.interval.lower)))
prec="0.0"
done=False
for elem in ret_list:
if (not Decimal(prec)>=Decimal(elem.cdf_up)) and (not done):
elem.cdf_low=prec
prec=elem.cdf_up
else:
elem.cdf_low="REMOVE"
if elem.cdf_up=="1.0":
done=True
#remove useless
ret_list= [x for x in ret_list if not x.cdf_low=="REMOVE"]
ret_list[-1].interval.include_upper=True
#plot_operation(edges_lower,values_lower,values_upper)
#plot_boxing(ret_list)
sum=0
for box in ret_list:
sum=sum+Decimal(box.cdf_up)-Decimal(box.cdf_low)
print("Check PDF from bounds to intervals: "+str(sum))
return ret_list
def compute_error_affine_form(self):
if self.operator == "+":
self.affine_error = self.leftoperand.affine_error.perform_affine_operation\
("+",self.rightoperand.affine_error)
elif self.operator == "-":
self.affine_error = self.leftoperand.affine_error.perform_affine_operation \
("-", self.rightoperand.affine_error)
elif self.operator == "*":
x_erry = self.exact_affines_forms[0].\
perform_affine_operation("*", self.rightoperand.affine_error,
recursion_limit_for_pruning=recursion_limit_for_pruning_error, dReal=False)
y_errx=self.exact_affines_forms[1].\
perform_affine_operation("*", self.leftoperand.affine_error,
recursion_limit_for_pruning=recursion_limit_for_pruning_error, dReal=False)
errx_erry=self.leftoperand.affine_error.\
perform_affine_operation("*", self.rightoperand.affine_error,
recursion_limit_for_pruning=recursion_limit_for_pruning_error, dReal=False)
self.affine_error = x_erry.perform_affine_operation(
"+", y_errx.perform_affine_operation("+", errx_erry))
elif self.operator == "/":
#val a = Interval.minAbs(rightInterval)
#val errorMultiplier: Rational = -one / (a * a)
total_affine_right = self.exact_affines_forms[1].\
perform_affine_operation("+", self.rightoperand.affine_error,
recursion_limit_for_pruning=recursion_limit_for_pruning_error, dReal=False)
total_interval_right = total_affine_right.compute_interval()
if check_zero_is_in_interval(total_interval_right):
print("Potential division by zero!")
exit(-1)
min_abs_string = find_min_abs_interval(total_interval_right)
multiplier_interval = Interval(
"-1.0", "-1.0", True, True,
digits_for_range).perform_interval_operation(
"/",
Interval(min_abs_string, min_abs_string, True, True,
digits_for_range).perform_interval_operation(
"*",
Interval(min_abs_string, min_abs_string, True,
True, digits_for_range)))
multiplier_affine = AffineInstance(multiplier_interval, {})
inv_erry = multiplier_affine.perform_affine_operation(
"*", self.rightoperand.affine_error)
x_err_one_over_y=self.exact_affines_forms[0].\
perform_affine_operation("*", inv_erry,
recursion_limit_for_pruning=recursion_limit_for_pruning_error, dReal=False)
one_over_y = self.exact_affines_forms[1].inverse()
one_over_y_err_x = one_over_y.perform_affine_operation(
"*",
self.leftoperand.affine_error,
recursion_limit_for_pruning=recursion_limit_for_pruning_error,
dReal=False)
errx_err_one_over_y = self.leftoperand.affine_error.\
perform_affine_operation("*", inv_erry,
recursion_limit_for_pruning=recursion_limit_for_pruning_error, dReal=False)
self.affine_error = x_err_one_over_y.perform_affine_operation(
"+",
one_over_y_err_x.perform_affine_operation(
"+", errx_err_one_over_y))
elif self.operator == "*+":
self.affine_error = self.leftoperand.affine_error.\
perform_affine_operation("+",
self.exact_affines_forms[0].perform_affine_operation("+", self.leftoperand.affine_error).
perform_affine_operation("*",self.rightoperand.discretization.affine))
else:
print("Operation not supported!")
exit(-1)
def clean_co_domain(pbox,
smt_manager,
expression_center,
divisions_SMT,
valid_for_exit_pruning,
recursion_limit_for_pruning,
start_recursion_limit=0,
dReal=True):
low, sup, inc_low, inc_sup = pbox.lower, pbox.upper, pbox.include_lower, pbox.include_upper
if Decimal(low) == Decimal(sup):
return pbox
codomain_intervals = linear_space_with_decimals(low, sup, inc_low, inc_sup,
divisions_SMT)
if len(codomain_intervals) == 0:
return pbox
exists_true = 0
unknown_counter = 0
for interval in codomain_intervals:
tmp_pbox = SMT_Interface.PBoxSolver(interval[0][0], interval[1][0],
interval[0][1], interval[1][1])
smt_manager.set_expression_central(expression_center, tmp_pbox)
smt_check = smt_manager.check(debug=False, dReal=dReal)
if not smt_check:
if exists_true >= 1:
break
else:
if smt_check > 1:
unknown_counter = unknown_counter + 1
interval[2] = True
exists_true = exists_true + 1
if len(codomain_intervals) < divisions_SMT:
exists_true = valid_for_exit_pruning + 1
double_check = False
for interval in codomain_intervals:
if interval[2]:
double_check = True
break
if not double_check:
smt_manager.operation_center = ()
print("Problem with cleaning. Z3:" +
str(smt_manager.check(debug=False, dReal=False)) + ", dReal:" +
str(smt_manager.check(debug=False, dReal=True)))
ret_box = Interval(low, sup, inc_low, inc_sup, digits_for_range)
return ret_box
for ind, interval in enumerate(codomain_intervals[:-1]):
if not interval[2]:
low = dec2Str(codomain_intervals[ind + 1][0][0])
inc_low = codomain_intervals[ind + 1][0][1]
else:
break
reversed_codomain = codomain_intervals[::-1]
for ind, interval in enumerate(reversed_codomain[:-1]):
if not interval[2]:
sup = dec2Str(reversed_codomain[ind + 1][1][0])
inc_sup = reversed_codomain[ind + 1][1][1]
else:
break
ret_box = Interval(low, sup, inc_low, inc_sup, digits_for_range)
if start_recursion_limit > recursion_limit_for_pruning:
print("Hit the recursion limit for pruning!!")
print("Limit:" + str(recursion_limit_for_pruning))
print("Low,Sup", low, sup)
if unknown_counter > 0:
return ret_box
if exists_true <= valid_for_exit_pruning and start_recursion_limit <= recursion_limit_for_pruning:
return clean_co_domain(ret_box,
smt_manager,
expression_center,
divisions_SMT,
valid_for_exit_pruning,
recursion_limit_for_pruning,
start_recursion_limit=start_recursion_limit + 1,
dReal=dReal)
return ret_box
def _pbox_dependent_execution(self):
left_operand_discr_SMT = copy.deepcopy(
self.leftoperand.get_discretization())
right_operand_discr_SMT = copy.deepcopy(
self.rightoperand.get_discretization())
expression_left = self.smt_triple[0]
expression_right = self.smt_triple[1]
smt_manager = self.smt_triple[2]
expression_center = create_exp_for_BinaryOperation_SMT_LIB(
expression_left, self.operator, expression_right)
if self.is_error_computation:
self.affine_error.update_interval()
domain_affine_SMT = self.affine_error
smt_manager.clean_expressions()
self.symbolic_affine = self.symbolic_error
constraint_expression = self.rightoperand.name #symbolic_affine.center
second_order_lower, second_order_upper = \
SymbolicToGelpia(self.symbolic_affine.center,self.symbolic_affine.variables).\
compute_concrete_bounds(zero_output_epsilon=True)
center_interval = Interval(second_order_lower, second_order_upper,
True, True, digits_for_range)
concrete_symbolic_interval = self.symbolic_affine.compute_interval_error(
center_interval)
print("Error domain: [" + str(concrete_symbolic_interval.lower) +
", " + str(concrete_symbolic_interval.upper) + "]")
else:
domain_affine_SMT = left_operand_discr_SMT.affine.perform_affine_operation(
self.operator, right_operand_discr_SMT.affine)
self.symbolic_affine = self.leftoperand.symbolic_affine.perform_affine_operation(
self.operator, self.rightoperand.symbolic_affine,
self.real_precision_constraints)
constraint_expression = None
center_interval = None
concrete_symbolic_interval = self.symbolic_affine.compute_interval(
)
insides_SMT = []
tmp_insides_SMT = []
evaluation_points = set()
print("Left-Intervals: " + str(len(left_operand_discr_SMT.intervals)))
print("Right-Intervals: " +
str(len(right_operand_discr_SMT.intervals)))
print("Pruning dependent operation...")
pool = MyPool(processes=num_processes_dependent_operation
) #, maxtasksperchild=3)
tmp_results = []
for index_left, left_op_box_SMT in enumerate(
left_operand_discr_SMT.intervals):
for index_right, right_op_box_SMT in enumerate(
right_operand_discr_SMT.intervals):
domain_interval = left_op_box_SMT.\
interval.perform_interval_operation(self.operator,right_op_box_SMT.interval)
intersection_interval = domain_interval.intersection(
domain_affine_SMT.interval)
if not intersection_interval == empty_interval:
intersection_interval = intersection_interval.intersection(
concrete_symbolic_interval)
if not intersection_interval == empty_interval:
tmp_results.append(
pool.apply_async(
dependentIteration,
args=[
index_left, index_right, smt_manager,
expression_left, expression_center,
expression_right, self.operator,
left_op_box_SMT, right_op_box_SMT,
domain_affine_SMT,
self.is_error_computation,
self.symbolic_affine,
concrete_symbolic_interval,
constraint_expression, center_interval
],
callback=tmp_insides_SMT.append))
print("Number of jobs for dependent operation: " +
str(len(tmp_results)))
pool.close()
pool.join()
print("\nDone with dependent operation\n")
for triple in tmp_insides_SMT:
if not triple[2] == empty_interval:
inside_box_SMT = PBox(triple[2], "prob", "prob")
insides_SMT.append(inside_box_SMT)
left_operand_discr_SMT.intervals[triple[0]].add_kid(
inside_box_SMT)
right_operand_discr_SMT.intervals[triple[1]].add_kid(
inside_box_SMT)
evaluation_points.add(Decimal(inside_box_SMT.interval.lower))
evaluation_points.add(Decimal(inside_box_SMT.interval.upper))
evaluation_points = sorted(evaluation_points)
if len(evaluation_points
) > discretization_points and not self.is_error_computation:
step = round(len(evaluation_points) / discretization_points)
step = max(1, step)
evaluation_points = sorted(
set(evaluation_points[::step] + [evaluation_points[-1]]))
lp_inst_SMT = LP_with_SMT(self.leftoperand.name,
self.rightoperand.name,
left_operand_discr_SMT.intervals,
right_operand_discr_SMT.intervals,
insides_SMT, evaluation_points)
upper_bound_cdf_ind_SMT, upper_bound_cdf_val_SMT = lp_inst_SMT.optimize_max(
)
lower_bound_cdf_ind_SMT, lower_bound_cdf_val_SMT = lp_inst_SMT.optimize_min(
)
print("Done with LP optimization problem")
if not lower_bound_cdf_ind_SMT == upper_bound_cdf_ind_SMT:
print("Lists should be identical")
exit(-1)
edge_cdf = lower_bound_cdf_ind_SMT
val_cdf_low = lower_bound_cdf_val_SMT
val_cdf_up = upper_bound_cdf_val_SMT
pboxes = from_DSI_to_PBox(edge_cdf, val_cdf_low, edge_cdf, val_cdf_up)
self.discretization = MixedArithmetic.clone_MixedArith_from_Args(
domain_affine_SMT, pboxes)
def add_constant_string(self, constant):
constant = Interval(constant, constant, True, True, digits_for_range)
new_center = self.center.addition(constant)
return AffineInstance(new_center, copy.deepcopy(self.coefficients))
def mult_constant_string(self, constant):
const_interval = Interval(constant, constant, True, True,
digits_for_range)
return self.mult_interval(const_interval)