69 lines
2.3 KiB
Python
69 lines
2.3 KiB
Python
# Copyright 2010-2022 Google LLC
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
"""helpers methods for the cp_model_builder module."""
|
|
|
|
import numbers
|
|
from typing import Any, Sequence, Union
|
|
import numpy as np
|
|
import numpy.typing as npt
|
|
|
|
# Custom types.
|
|
NumberT = Union[numbers.Number, np.number]
|
|
|
|
|
|
def is_integral(x: Any) -> bool:
|
|
"""Checks if x has either a number.Integral or a np.integer type."""
|
|
return isinstance(x, numbers.Integral) or isinstance(x, np.integer)
|
|
|
|
|
|
def is_a_number(x: Any) -> bool:
|
|
"""Checks if x has either a number.Number or a np.double type."""
|
|
return isinstance(x, numbers.Number) or isinstance(
|
|
x, np.double) or isinstance(x, np.integer)
|
|
|
|
|
|
def is_zero(x: Any) -> bool:
|
|
"""Checks if the x is 0 or 0.0."""
|
|
return (is_integral(x) and int(x) == 0) or (is_a_number(x) and
|
|
float(x) == 0.0)
|
|
|
|
|
|
def is_one(x: Any) -> bool:
|
|
"""Checks if x is 1 or 1.0."""
|
|
return (is_integral(x) and int(x) == 1) or (is_a_number(x) and
|
|
float(x) == 1.0)
|
|
|
|
|
|
def is_minus_one(x: Any) -> bool:
|
|
"""Checks if x is -1 or -1.0."""
|
|
return (is_integral(x) and int(x) == -1) or (is_a_number(x) and
|
|
float(x) == -1.0)
|
|
|
|
|
|
def assert_is_a_number(x: NumberT) -> np.double:
|
|
"""Asserts that x is a number and converts to a np.double."""
|
|
if not is_a_number(x):
|
|
raise TypeError('Not a number: %s' % x)
|
|
return np.double(x)
|
|
|
|
|
|
def assert_is_a_number_array(x: Sequence[NumberT]) -> npt.NDArray[np.double]:
|
|
"""Asserts x is a list of numbers and converts it to np.array(np.double)."""
|
|
result = np.empty(len(x), dtype=np.double)
|
|
pos = 0
|
|
for c in x:
|
|
result[pos] = assert_is_a_number(c)
|
|
pos += 1
|
|
assert pos == len(x)
|
|
return result
|