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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/language_detection/core/quantization_utils.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace language_detection {
TEST(QuantizationUtilsTest, FloatToQuantized) {
const float min_val = 0.f;
const float max_val = 4.f;
const int num_bits = 16;
// 0.f should map to quantized 0.
EXPECT_EQ(0u, FloatToQuantized(/*x =*/0.f, min_val, max_val, num_bits));
// A value below the floating point minimum should also map to quantized 0.
EXPECT_EQ(0u, FloatToQuantized(/*x =*/-1.f, min_val, max_val, num_bits));
// 2.f which lies in the middle of the range should map to the middle of the
// quantized range.
EXPECT_EQ((1u << (num_bits - 1)),
FloatToQuantized(/*x=*/2.f, min_val, max_val, num_bits));
// 4.f should map to the highest quantized value.
EXPECT_EQ(((1u << num_bits) - 1),
FloatToQuantized(/*x=*/4.f, min_val, max_val, num_bits));
// A value above the floating point maximum should also map to the highest
// quantized value.
EXPECT_EQ(((1u << num_bits) - 1),
FloatToQuantized(/*x=*/5.f, min_val, max_val, num_bits));
}
class QuantizedToFloatParamTest : public testing::Test,
public testing::WithParamInterface<bool> {};
// A single parameterized test which validates that the dequantization happens
// correctly, with both single stage and two stage dequantization.
TEST_P(QuantizedToFloatParamTest, QuantizedToFloat) {
const bool two_stage_dequantization = QuantizedToFloatParamTest::GetParam();
const float min_val = 0.0;
const float max_val = 4.0;
const float max_abs_err = (max_val - min_val) * 1e-5;
const int num_bits = 16;
auto dequantize = [two_stage_dequantization](float x, float min_val,
float max_val,
int num_bits) -> float {
if (two_stage_dequantization) {
QuantizationParams params =
GetQuantizationParams(min_val, max_val, num_bits);
return QuantizedToFloatWithQuantParams(x, params);
} else {
return QuantizedToFloat(x, min_val, max_val, num_bits);
}
};
// Quantized 0 should map to `min_vals`.
EXPECT_EQ(min_val, dequantize(/*x =*/0, min_val, max_val, num_bits));
// Middle of the quantized range should map to the middle of the floating
// point range.
EXPECT_NEAR(
(max_val + min_val) / 2.0,
dequantize(/*x=*/(1 << (num_bits - 1)), min_val, max_val, num_bits),
max_abs_err);
// The highest quantized value should map to `max_val`.
EXPECT_NEAR(
max_val,
dequantize(/*x=*/((1 << num_bits) - 1), min_val, max_val, num_bits),
max_abs_err);
// A value above the quantized maximum should also map to the highest
// floating point value.
EXPECT_NEAR(
max_val,
dequantize(/*x=*/((1 << num_bits) - 1), min_val, max_val, num_bits),
max_abs_err);
}
INSTANTIATE_TEST_SUITE_P(QuantizedToFloatParamTests,
QuantizedToFloatParamTest,
testing::Bool());
} // namespace language_detection
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