blob: ae2a91797b68d1d9c2fcf0b16763c0387998e5cd [file] [log] [blame]
# Copyright 2018 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Utility functions for processing floating point operations."""
def AlmostEquals(float_a, float_b, tolerance=ABSOLUTE_TOLERANCE):
"""Determines whether two floating points are very close to one another.
float_a (float): The first number to compare.
float_b (float): The second number to compare.
tolerance (float): The maximum allowalbe distance between the two numbers.
(bool): Whether or not the two input floating points are almost equal within
the specified tolerance.
assert float_a is not None
assert float_b is not None
# Add support for ints too.
float_a = float(float_a)
float_b = float(float_b)
if not float_a or not float_b:
return abs(float_a - float_b) <= tolerance
percentage_same = (
min(abs(float_a), abs(float_b)) / max(abs(float_a), abs(float_b)))
import numpy # workaround to run locally.
return (numpy.sign(float_a) == numpy.sign(float_b) and
1.0 - percentage_same <= tolerance)