mirror of https://github.com/google/gemma.cpp.git
65 lines
2.2 KiB
C++
65 lines
2.2 KiB
C++
// Copyright 2023 Google LLC
|
|
// SPDX-License-Identifier: Apache-2.0
|
|
//
|
|
// 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.
|
|
|
|
#ifndef THIRD_PARTY_GEMMA_CPP_COMPRESSION_TEST_UTIL_H_
|
|
#define THIRD_PARTY_GEMMA_CPP_COMPRESSION_TEST_UTIL_H_
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
#include <cmath>
|
|
|
|
#include "hwy/base.h"
|
|
|
|
// IWYU pragma: begin_exports
|
|
// copybara:import_next_line:gemma_cpp
|
|
#include "compression/distortion.h"
|
|
// copybara:import_next_line:gemma_cpp
|
|
#include "compression/stats.h"
|
|
#include "hwy/tests/test_util.h" // RandomState
|
|
// IWYU pragma: end_exports
|
|
|
|
namespace gcpp {
|
|
|
|
// Returns random Gaussian (mean=0, stddev=1/3 similar to expected weights)
|
|
// using the central limit theorem. Avoid std::normal_distribution for
|
|
// consistent cross-platform output.
|
|
HWY_INLINE double RandomGaussian(hwy::RandomState& rng) {
|
|
uint64_t sum = 0;
|
|
constexpr int kReps = 40;
|
|
for (int rep = 0; rep < kReps; ++rep) {
|
|
sum += hwy::Random32(&rng) & 0xFFFFF;
|
|
}
|
|
const double sum_f =
|
|
static_cast<double>(sum) / static_cast<double>(0xFFFFF * kReps);
|
|
HWY_ASSERT(0.0 <= sum_f && sum_f <= 1.0);
|
|
const double plus_minus_1 = 2.0 * sum_f - 1.0;
|
|
HWY_ASSERT(-1.0 <= plus_minus_1 && plus_minus_1 <= 1.0);
|
|
// Normalize by stddev of sum of uniform random scaled to [-1, 1].
|
|
return plus_minus_1 * std::sqrt(kReps / 3.0);
|
|
};
|
|
|
|
HWY_INLINE void VerifyGaussian(Stats& stats) {
|
|
const double stddev = stats.StandardDeviation();
|
|
HWY_ASSERT(-0.01 <= stats.Mean() && stats.Mean() <= 0.01);
|
|
HWY_ASSERT(0.30 <= stddev && stddev <= 0.35);
|
|
HWY_ASSERT(-1.1 <= stats.Min() && stats.Min() <= -0.9);
|
|
HWY_ASSERT(0.9 <= stats.Max() && stats.Max() <= 1.1);
|
|
}
|
|
|
|
} // namespace gcpp
|
|
|
|
#endif // THIRD_PARTY_GEMMA_CPP_COMPRESSION_TEST_UTIL_H_
|