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/*
* Copyright (c) 2020 Samsung Electronics Co., Ltd. All Rights Reserved
*
* 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 "luci/Pass/MakeBatchNormGammaPositivePass.h"
#include "BatchNormPatternFinder.h"
#include <luci/IR/CircleNodes.h>
namespace
{
// Update negative gamma to positive (1e-10)
bool negative_gamma_to_positive(luci::CircleConst *gamma)
{
assert(gamma->dtype() == loco::DataType::FLOAT32);
bool changed = false;
uint32_t size = gamma->size<loco::DataType::FLOAT32>();
for (uint32_t i = 0; i < size; ++i)
{
if (gamma->at<loco::DataType::FLOAT32>(i) < 0)
{
gamma->at<loco::DataType::FLOAT32>(i) = 1e-10;
changed = true;
}
}
return changed;
}
bool make_positive_gamma(luci::CircleAdd *add)
{
luci::CircleMul *mul = nullptr;
luci::CircleConst *beta = nullptr;
luci::CircleConst *gamma = nullptr;
luci::CircleNode *pred = nullptr;
if (!is_batchnorm_add(add, mul, beta))
return false;
if (loco::succs(mul).size() != 1)
return false;
if (!is_batchnorm_mul(mul, pred, gamma))
return false;
assert(pred == add);
// Only support Relu
if (add->fusedActivationFunction() != luci::FusedActFunc::RELU)
return false;
return negative_gamma_to_positive(gamma);
}
} // namespace
namespace luci
{
/**
* Make negative gamma values of Mul-Add (as BatchNorm) to a small positive value (1e-10)
*
* PATTERN:
* |
* [CircleNode] [CircleConst](as gamma)
* | |
* [CircleMul] [CircleConst]
* | |
* [CircleAdd]
* |
*/
bool MakeBatchNormGammaPositivePass::run(loco::Graph *g)
{
bool changed = false;
for (auto node : loco::active_nodes(loco::output_nodes(g)))
{
auto add = dynamic_cast<luci::CircleAdd *>(node);
if (add == nullptr)
continue;
if (make_positive_gamma(add))
changed = true;
}
return changed;
}
} // namespace luci
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