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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 "func_debug.h"
#include "half.hpp"
#include "verifiers.h"
#include <cfloat>
#include <cmath>
#include <numeric>
#include <optional>
#include <type_traits>
namespace TosaReference
{
namespace
{
// Generic element validation function
template <typename AccType>
std::optional<double> validateElement(size_t index, double ref, double bnd, AccType imp, size_t KS)
{
double err = 0.0;
bool is_valid = true;
if (std::isinf(static_cast<AccType>(bnd)))
{
// dot product can overflow and there is no accuracy limit
is_valid = true;
err = 0.0;
}
else if (bnd == 0.0)
{
is_valid = (ref == 0.0) && (imp == 0.0);
if (!is_valid)
{
WARNING("[Verifier][DP] index %d: bound is zero, but ref (%.*g) or imp (%.*g) is not.", index, DBL_DIG, ref,
FLT_DIG, imp);
}
err = 0.0;
}
else
{
// 0.0 < bnd < infinity
const double out_err_bnd =
std::max(bnd * exp2(-1 - AccPrecision<AccType>::normal_frac), AccPrecision<AccType>::normal_min);
const double imp_fp64 = static_cast<double>(imp);
err = (imp_fp64 - ref) / out_err_bnd;
is_valid = std::abs(err) <= KS;
if (!is_valid)
{
WARNING("[Verifier][DP] index %d: out_err (abs(%.*g)) is not within KS (%d).", index, DBL_DIG, err, KS);
}
}
return is_valid ? std::optional(err) : std::nullopt;
}
// Generic data validation function
template <typename AccType>
bool validateData(const double* ref,
const double* bnd,
const AccType* imp,
const std::vector<int32_t>& shape,
const DotProductVerifyInfo& cfg)
{
const size_t T = static_cast<size_t>(numElements(shape));
TOSA_REF_REQUIRE(T > 0, "[DP] Invalid shape for reference tensor");
const int32_t S = cfg.s;
// NOTE: KS in the compliance config MUST have already been updated to (KS + 1) if the bias
// tensor is non-zero
const int32_t KS = cfg.ks;
double out_err_sum = 0.0;
double out_err_sumsq = 0.0;
for (size_t i = 0; i < T; ++i)
{
auto out_err = validateElement<AccType>(i, ref[i], bnd[i], imp[i], KS);
if (!out_err)
{
auto pos = indexToPosition(i, shape);
TOSA_REF_REQUIRE(out_err, "[DP] Location %s: Data required to be zero or error within range",
positionToString(pos).c_str());
}
out_err_sum += out_err.value();
out_err_sumsq += out_err.value() * out_err.value();
}
if (S >= 3 && S <= 5)
{
const double max_bias = 2 * sqrt(KS * T);
// Check error bias magnitude for data sets S which are not positive biased
TOSA_REF_REQUIRE(std::abs(out_err_sum) <= max_bias, "[DP] Bias magnitude (abs(%.*g)) is out of range (%.*g)",
DBL_DIG, out_err_sum, DBL_DIG, max_bias);
}
// Check error variance magnitude
const double max_error = 0.4 * KS * T;
TOSA_REF_REQUIRE(out_err_sumsq <= max_error, "[DP] Error variance magnitude (%.*g) is out of range (%.*g)", DBL_DIG,
out_err_sumsq, DBL_DIG, max_error);
return true;
}
} // namespace
bool verifyDotProduct(const CTensor* ref, const CTensor* refBnd, const CTensor* imp, const DotProductVerifyInfo& dpInfo)
{
// Validate that tensors are provided
TOSA_REF_REQUIRE(ref != nullptr, "[DP] Reference tensor is missing");
TOSA_REF_REQUIRE(refBnd != nullptr, "[DP] Reference bounds tensor is missing");
TOSA_REF_REQUIRE(imp != nullptr, "[DP] Implementation tensor is missing");
const std::vector<int32_t> refShape(ref->shape, ref->shape + ref->num_dims);
const double* refData = reinterpret_cast<const double*>(ref->data);
const double* refBndData = reinterpret_cast<const double*>(refBnd->data);
TOSA_REF_REQUIRE(refData != nullptr && refBndData != nullptr, "[DP] Missing data for reference or bounds tensors");
switch (imp->data_type)
{
case tosa_datatype_fp32_t: {
const float* impData = reinterpret_cast<const float*>(imp->data);
TOSA_REF_REQUIRE(impData != nullptr, "[DP] Missing data for implementation");
return validateData(refData, refBndData, impData, refShape, dpInfo);
break;
}
case tosa_datatype_fp16_t: {
const half_float::half* impData = reinterpret_cast<const half_float::half*>(imp->data);
TOSA_REF_REQUIRE(impData != nullptr, "[DP] Missing data for implementation");
return validateData(refData, refBndData, impData, refShape, dpInfo);
break;
}
default: {
WARNING("[Verifier][DP] Data-type not supported.");
break;
}
}
return false;
}
} // namespace TosaReference
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