# -*- coding: utf-8 -*-
"""Several utility functions."""
# OpenKiwi: Open-Source Machine Translation Quality Estimation
# Copyright (C) 2019 Unbabel <openkiwi@unbabel.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
[docs]def nearly_eq_tol(a, b, tol):
"""Checks if two numbers are equal up to a tolerance."""
return (a - b) * (a - b) <= tol
[docs]def nearly_binary_tol(a, tol):
"""Checks if a number is binary up to a tolerance."""
return nearly_eq_tol(a, 0.0, tol) or nearly_eq_tol(a, 1.0, tol)
[docs]def nearly_zero_tol(a, tol):
"""Checks if a number is zero up to a tolerance."""
return (a <= tol) and (a >= -tol)