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polynomial_core.py
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from numba.extending import (models, register_model, type_callable,
unbox, NativeValue, make_attribute_wrapper, box,
lower_builtin)
from numba.core import types, cgutils
import warnings
from numba.core.errors import NumbaExperimentalFeatureWarning, NumbaValueError
from numpy.polynomial.polynomial import Polynomial
from contextlib import ExitStack
import numpy as np
from llvmlite import ir
@register_model(types.PolynomialType)
class PolynomialModel(models.StructModel):
def __init__(self, dmm, fe_type):
members = [
('coef', fe_type.coef),
('domain', fe_type.domain),
('window', fe_type.window)
# Introduced in NumPy 1.24, maybe leave it out for now
# ('symbol', types.string)
]
super(PolynomialModel, self).__init__(dmm, fe_type, members)
@type_callable(Polynomial)
def type_polynomial(context):
def typer(coef, domain=None, window=None):
default_domain = types.Array(types.int64, 1, 'C')
double_domain = types.Array(types.double, 1, 'C')
default_window = types.Array(types.int64, 1, 'C')
double_window = types.Array(types.double, 1, 'C')
double_coef = types.Array(types.double, 1, 'C')
warnings.warn("Polynomial class is experimental",
category=NumbaExperimentalFeatureWarning)
if isinstance(coef, types.Array) and \
all([a is None for a in (domain, window)]):
if coef.ndim == 1:
# If Polynomial(coef) is called, coef is cast to double dtype,
# and domain and window are set to equal [-1, 1], i.e. have
# integer dtype
return types.PolynomialType(double_coef,
default_domain,
default_window,
1)
else:
msg = 'Coefficient array is not 1-d'
raise NumbaValueError(msg)
elif all([isinstance(a, types.Array) for a in (coef, domain, window)]):
if coef.ndim == 1:
if all([a.ndim == 1 for a in (domain, window)]):
# If Polynomial(coef, domain, window) is called, then coef,
# domain and window are cast to double dtype
return types.PolynomialType(double_coef,
double_domain,
double_window,
3)
else:
msg = 'Coefficient array is not 1-d'
raise NumbaValueError(msg)
return typer
make_attribute_wrapper(types.PolynomialType, 'coef', 'coef')
make_attribute_wrapper(types.PolynomialType, 'domain', 'domain')
make_attribute_wrapper(types.PolynomialType, 'window', 'window')
# Introduced in NumPy 1.24, maybe leave it out for now
# make_attribute_wrapper(types.PolynomialType, 'symbol', 'symbol')
@lower_builtin(Polynomial, types.Array)
def impl_polynomial1(context, builder, sig, args):
def to_double(arr):
return np.asarray(arr, dtype=np.double)
def const_impl():
return np.asarray([-1, 1])
typ = sig.return_type
polynomial = cgutils.create_struct_proxy(typ)(context, builder)
sig_coef = sig.args[0].copy(dtype=types.double)(sig.args[0])
coef_cast = context.compile_internal(builder, to_double, sig_coef, args)
sig_domain = sig.args[0].copy(dtype=types.intp)()
sig_window = sig.args[0].copy(dtype=types.intp)()
domain_cast = context.compile_internal(builder, const_impl, sig_domain, ())
window_cast = context.compile_internal(builder, const_impl, sig_window, ())
polynomial.coef = coef_cast
polynomial.domain = domain_cast
polynomial.window = window_cast
return polynomial._getvalue()
@lower_builtin(Polynomial, types.Array, types.Array, types.Array)
def impl_polynomial3(context, builder, sig, args):
def to_double(coef):
return np.asarray(coef, dtype=np.double)
typ = sig.return_type
polynomial = cgutils.create_struct_proxy(typ)(context, builder)
coef_sig = sig.args[0].copy(dtype=types.double)(sig.args[0])
domain_sig = sig.args[1].copy(dtype=types.double)(sig.args[1])
window_sig = sig.args[2].copy(dtype=types.double)(sig.args[2])
coef_cast = context.compile_internal(builder,
to_double, coef_sig,
(args[0],))
domain_cast = context.compile_internal(builder,
to_double, domain_sig,
(args[1],))
window_cast = context.compile_internal(builder,
to_double, window_sig,
(args[2],))
domain_helper = context.make_helper(builder,
domain_sig.return_type,
value=domain_cast)
window_helper = context.make_helper(builder,
window_sig.return_type,
value=window_cast)
i64 = ir.IntType(64)
two = i64(2)
s1 = builder.extract_value(domain_helper.shape, 0)
s2 = builder.extract_value(window_helper.shape, 0)
pred1 = builder.icmp_signed('!=', s1, two)
pred2 = builder.icmp_signed('!=', s2, two)
with cgutils.if_unlikely(builder, pred1):
context.call_conv.return_user_exc(
builder, ValueError,
("Domain has wrong number of elements.",))
with cgutils.if_unlikely(builder, pred2):
context.call_conv.return_user_exc(
builder, ValueError,
("Window has wrong number of elements.",))
polynomial.coef = coef_cast
polynomial.domain = domain_helper._getvalue()
polynomial.window = window_helper._getvalue()
return polynomial._getvalue()
@unbox(types.PolynomialType)
def unbox_polynomial(typ, obj, c):
"""
Convert a Polynomial object to a native polynomial structure.
"""
is_error_ptr = cgutils.alloca_once_value(c.builder, cgutils.false_bit)
polynomial = cgutils.create_struct_proxy(typ)(c.context, c.builder)
with ExitStack() as stack:
natives = []
for name in ("coef", "domain", "window"):
attr = c.pyapi.object_getattr_string(obj, name)
with cgutils.early_exit_if_null(c.builder, stack, attr):
c.builder.store(cgutils.true_bit, is_error_ptr)
t = getattr(typ, name)
native = c.unbox(t, attr)
c.pyapi.decref(attr)
with cgutils.early_exit_if(c.builder, stack, native.is_error):
c.builder.store(cgutils.true_bit, is_error_ptr)
natives.append(native)
polynomial.coef = natives[0]
polynomial.domain = natives[1]
polynomial.window = natives[2]
return NativeValue(polynomial._getvalue(),
is_error=c.builder.load(is_error_ptr))
@box(types.PolynomialType)
def box_polynomial(typ, val, c):
"""
Convert a native polynomial structure to a Polynomial object.
"""
ret_ptr = cgutils.alloca_once(c.builder, c.pyapi.pyobj)
fail_obj = c.pyapi.get_null_object()
with ExitStack() as stack:
polynomial = cgutils.create_struct_proxy(typ)(c.context, c.builder,
value=val)
coef_obj = c.box(typ.coef, polynomial.coef)
with cgutils.early_exit_if_null(c.builder, stack, coef_obj):
c.builder.store(fail_obj, ret_ptr)
domain_obj = c.box(typ.domain, polynomial.domain)
with cgutils.early_exit_if_null(c.builder, stack, domain_obj):
c.builder.store(fail_obj, ret_ptr)
window_obj = c.box(typ.window, polynomial.window)
with cgutils.early_exit_if_null(c.builder, stack, window_obj):
c.builder.store(fail_obj, ret_ptr)
class_obj = c.pyapi.unserialize(c.pyapi.serialize_object(Polynomial))
with cgutils.early_exit_if_null(c.builder, stack, class_obj):
c.pyapi.decref(coef_obj)
c.pyapi.decref(domain_obj)
c.pyapi.decref(window_obj)
c.builder.store(fail_obj, ret_ptr)
if typ.n_args == 1:
res1 = c.pyapi.call_function_objargs(class_obj, (coef_obj,))
c.builder.store(res1, ret_ptr)
else:
res3 = c.pyapi.call_function_objargs(class_obj, (coef_obj,
domain_obj,
window_obj))
c.builder.store(res3, ret_ptr)
c.pyapi.decref(coef_obj)
c.pyapi.decref(domain_obj)
c.pyapi.decref(window_obj)
c.pyapi.decref(class_obj)
return c.builder.load(ret_ptr)