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fec_hashing_test.cc
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/
fec_hashing_test.cc
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// Copyright 2024 The Google Research Authors.
//
// 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.
#include "fec_hashing.h"
#include <limits>
#include "definitions.h"
#include "gtest/gtest.h"
namespace automl_zero {
using ::std::function;
using ::std::vector;
using ::testing::Test;
typedef
function<size_t(const vector<double>&, const vector<double>&,
size_t, IntegerT)>
HashFunction;
class HashFunctionTest : public Test {
protected:
void VerifyProducesEqualHashesForEqualVectors(
const HashFunction& hash_function) {
EXPECT_EQ(hash_function({0.6}, {0.0}, 0, 1000),
hash_function({0.6}, {0.0}, 0, 1000));
EXPECT_EQ(hash_function({0.6, 0.2}, {0.8, 2.5}, 1, 1000),
hash_function({0.6, 0.2}, {0.8, 2.5}, 1, 1000));
EXPECT_EQ(hash_function({0.6, 0.2, 0.0}, {0.8, 2.5, 10.1}, 2, 1000),
hash_function({0.6, 0.2, 0.0}, {0.8, 2.5, 10.1}, 2, 1000));
}
void VerifyDetectsDifferenceInSingleValue(const HashFunction& hash_function) {
EXPECT_NE(hash_function({0.6}, {0.0}, 0, 1000),
hash_function({0.601}, {0.0}, 0, 1000));
EXPECT_NE(hash_function({0.6, 0.2}, {0.8, 2.5}, 1, 1000),
hash_function({0.6, 0.2}, {0.81, 2.5}, 1, 1000));
EXPECT_NE(hash_function({0.6, 0.2, 0.0}, {0.8, 2.5, 10.1}, 2, 1000),
hash_function({0.6, 0.2, 0.0001}, {0.8, 2.5, 10.1}, 2, 1000));
EXPECT_NE(hash_function({0.6, 0.2, 0.0}, {0.8, 2.5, 10.1}, 3, 1000),
hash_function({0.6, 0.2, 0.0}, {0.8, 2.5, 10.1}, 30, 1000));
EXPECT_NE(hash_function({0.6, 0.2, 0.0}, {0.8, 2.5, 10.1}, 3, 1000),
hash_function({0.6, 0.2, 0.0}, {0.8, 2.5, 10.1}, 3, 1001));
}
void VerifyDetectsDifferenceInMultipleValues(
const HashFunction& hash_function) {
EXPECT_NE(hash_function({0.6, 0.2, 0.0}, {0.8, 2.5, 10.1}, 0, 1000),
hash_function({0.6, 0.1, 0.0}, {0.8, 2.6, 10.1}, 0, 1000));
EXPECT_NE(hash_function({0.6, 0.2, 0.0}, {0.8, 2.5, 10.1}, 1, 1000),
hash_function({0.6, 0.1, 0.1}, {0.8, 2.5, 10.1}, 1, 1000));
EXPECT_NE(hash_function({0.6, 0.2, 0.0}, {0.8, 2.5, 10.1}, 2, 1000),
hash_function({0.6, 0.2, 0.0}, {0.8, 2.6, 10.0}, 2, 1000));
EXPECT_NE(hash_function({0.6, 0.2, 0.0}, {0.8, 2.5, 10.1}, 3, 1000),
hash_function({0.6, 0.2, 0.0}, {0.8, 2.6, 10.0}, 4, 1000));
EXPECT_NE(hash_function({0.6, 0.2, 0.0}, {0.8, 2.5, 10.1}, 3, 1000),
hash_function({0.6, 0.2, 0.0}, {0.8, 2.6, 10.0}, 4, 10000));
}
void VerifyDetectsDifferenceInNumberOfValues(
const HashFunction& hash_function) {
EXPECT_NE(hash_function({0.6, 0.2, 0.0}, {0.8, 2.5, 10.1}, 0, 1000),
hash_function({0.6, 0.2}, {0.8, 2.5, 10.1}, 0, 1000));
EXPECT_NE(hash_function({0.6, 0.2, 0.0}, {0.8, 2.5, 10.1}, 0, 1000),
hash_function({0.6, 0.2, 0.0}, {0.8, 2.5}, 0, 1000));
EXPECT_NE(hash_function({0.6, 0.2, 0.0}, {0.8, 2.5, 10.1}, 0, 1000),
hash_function({0.6, 0.2}, {0.8, 2.5}, 0, 1000));
}
void VerifyHandlesLargeValues(const HashFunction& hash_function) {
EXPECT_EQ(hash_function({0.6, 1000000000.0}, {0.8, 2.5}, 0, 1000),
hash_function({0.6, 1000000000.0}, {0.8, 2.5}, 0, 1000));
EXPECT_NE(hash_function({0.6, 1000000000.0}, {0.8, 2.5}, 0, 1000),
hash_function({0.7, 1000000000.0}, {0.8, 2.5}, 0, 1000));
}
void VerifyHandlesInfinity(const HashFunction& hash_function) {
const double inf = std::numeric_limits<double>::infinity();
EXPECT_EQ(hash_function({0.6, inf}, {0.8, 2.5}, 0, 1000),
hash_function({0.6, inf}, {0.8, 2.5}, 0, 1000));
EXPECT_NE(hash_function({0.6, inf}, {0.8, 2.5}, 0, 1000),
hash_function({0.7, inf}, {0.8, 2.5}, 0, 1000));
EXPECT_NE(hash_function({0.6, inf}, {0.8, 2.5}, 0, 1000),
hash_function({0.6, 1.0}, {0.8, 2.5}, 0, 1000));
}
void VerifyHandlesNan(const HashFunction& hash_function) {
const double nan = std::numeric_limits<double>::quiet_NaN();
EXPECT_EQ(hash_function({0.6, nan}, {0.8, 2.5}, 0, 1000),
hash_function({0.6, nan}, {0.8, 2.5}, 0, 1000));
EXPECT_NE(hash_function({0.6, nan}, {0.8, 2.5}, 0, 1000),
hash_function({0.7, nan}, {0.8, 2.5}, 0, 1000));
EXPECT_NE(hash_function({0.6, nan}, {0.8, 2.5}, 0, 1000),
hash_function({0.6, 1.0}, {0.8, 2.5}, 0, 1000));
}
};
TEST_F(HashFunctionTest, WellMixedHashWorksCorrectly) {
VerifyProducesEqualHashesForEqualVectors(WellMixedHash);
VerifyDetectsDifferenceInSingleValue(WellMixedHash);
VerifyDetectsDifferenceInMultipleValues(WellMixedHash);
VerifyDetectsDifferenceInNumberOfValues(WellMixedHash);
VerifyHandlesLargeValues(WellMixedHash);
VerifyHandlesInfinity(WellMixedHash);
VerifyHandlesNan(WellMixedHash);
}
} // namespace automl_zero