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// Copyright (c) 2023-2024, ARM Limited.
//
// 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 <cmath>
#include <limits>
#include <memory>
#include <type_traits>
#include <utility>
#include "half.hpp"
#include "verifiers.h"
namespace TosaReference
{
namespace
{
template <typename OutType>
bool tosaCheckULP(OutType testValue, double referenceValue, double ulpNum)
{
double errorBound = 0.0;
if (std::isfinite(referenceValue) && std::abs(referenceValue) != 0.0)
{
// Find the exponent of the reference value.
int32_t referenceExponent = ilog2(std::abs(referenceValue));
// Work out the values magnitude - by raising 2 to the power of the
// exponent and taking the normalized minimum for denormal values
const double referencePower2 = std::max(exp2(referenceExponent), AccPrecision<OutType>::normal_min);
// Get the value of changing the last bit - by shifting the least significant bit to this magnitude
// i.e. the ULP.
double ulpValue = referencePower2 * exp2(-AccPrecision<OutType>::normal_frac);
errorBound = ulpValue * ulpNum;
}
return tosaCheckFloatBound(testValue, referenceValue, errorBound);
}
} // namespace
bool verifyULP(const CTensor* referenceTensor, const CTensor* implementationTensor, const UlpVerifyInfo& ulpInfo)
{
// Validate that tensors are provided
TOSA_REF_REQUIRE(referenceTensor != nullptr, "[ULP] Reference tensor is missing");
TOSA_REF_REQUIRE(implementationTensor != nullptr, "[ULP] Implementation tensor is missing");
// Get number of elements
const std::vector<int32_t> refShape(referenceTensor->shape, referenceTensor->shape + referenceTensor->num_dims);
const auto elementCount = numElements(refShape);
TOSA_REF_REQUIRE(elementCount > 0, "[ULP] Invalid shape for reference tensor");
const double ulp = ulpInfo.ulp;
const auto* refData = reinterpret_cast<const double*>(referenceTensor->data);
TOSA_REF_REQUIRE(refData != nullptr, "[ULP] Missing data for reference");
const auto* refDataEnd = std::next(refData, elementCount);
switch (implementationTensor->data_type)
{
case tosa_datatype_fp32_t: {
const auto* impData = reinterpret_cast<const float*>(implementationTensor->data);
TOSA_REF_REQUIRE(impData != nullptr, "[ULP] Missing data for implementation");
// Use mismatch to get the location of the first unequal value
auto pair = std::mismatch(refData, refDataEnd, impData, std::next(impData, elementCount),
[ulp](const auto& referenceValue, const auto& implementationValue) {
return tosaCheckULP(implementationValue, referenceValue, ulp);
});
if (std::get<0>(pair) == refDataEnd)
{
// No mismatch found
return true;
}
else
{
auto pos = indexToPosition(std::get<0>(pair) - refData, refShape);
WARNING("[Verfier][ULP] Location %s", positionToString(pos).c_str());
return false;
}
}
case tosa_datatype_fp16_t: {
const auto* impData = reinterpret_cast<const half_float::half*>(implementationTensor->data);
TOSA_REF_REQUIRE(impData != nullptr, "[ULP] Missing data for implementation");
// Use mismatch to get the location of the first unequal value
auto pair = std::mismatch(refData, refDataEnd, impData, std::next(impData, elementCount),
[ulp](const auto& referenceValue, const auto& implementationValue) {
return tosaCheckULP(implementationValue, referenceValue, ulp);
});
if (std::get<0>(pair) == refDataEnd)
{
// No mismatch found
return true;
}
else
{
auto pos = indexToPosition(std::get<0>(pair) - refData, refShape);
WARNING("[Verfier][ULP] Location %s", positionToString(pos).c_str());
return false;
}
}
default:
WARNING("[Verifier][ULP] Data-type not supported.");
break;
}
return false;
}
} // namespace TosaReference
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