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/*
* Copyright (c) 2023 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/FusePReluPass.h"
#include "helpers/NodeFiller.h"
#include <luci/IR/CircleNodes.h>
#include <luci/Profile/CircleNodeOrigin.h>
#include <luci/Service/CircleNodeClone.h>
#include <cassert>
// Helper to fuse PRelu
namespace
{
/**
* Below diagram shows PRelu pattern to fuse.
* - this pattern will be replaced with one PRelu
*
* [In]
* |
* V
* +---- ifm ----+
* | | |
* | | V
* | | abs
* | V |
* | sub <---+
* | |
* | V
* | mul_alpha (alpha of PRelu)
* | |
* V V
* relu mul_half (0.5)
* | |
* | V
* +---> add
* |
* V
* [Out]
*
*/
class PReluPattern final
{
public:
PReluPattern(luci::CircleAdd *candidate)
{
assert(candidate);
_add_ofm = candidate;
}
public:
bool matched();
public:
luci::CircleNode *_ifm = nullptr;
luci::CircleRelu *_relu = nullptr;
luci::CircleAbs *_abs = nullptr;
luci::CircleSub *_sub = nullptr;
luci::CircleMul *_mul_alpha = nullptr;
luci::CircleMul *_mul_half = nullptr;
luci::CircleAdd *_add_ofm = nullptr;
luci::CircleConst *_const_alpha = nullptr;
luci::CircleConst *_const_half = nullptr;
};
#define CHECK_OR_FALSE(condition) \
if (not(condition)) \
return false;
bool PReluPattern::matched()
{
// check pattern
CHECK_OR_FALSE(luci::fill(&_relu, &_mul_half).with_commutative_args_of(_add_ofm));
CHECK_OR_FALSE(luci::fill(&_mul_alpha, &_const_half).with_commutative_args_of(_mul_half));
CHECK_OR_FALSE(luci::fill(&_sub, &_const_alpha).with_commutative_args_of(_mul_alpha));
CHECK_OR_FALSE(luci::fill(&_ifm, &_abs).with_args_of(_sub));
CHECK_OR_FALSE(_relu->features() == _ifm);
CHECK_OR_FALSE(_abs->x() == _ifm);
// Check Activation to be NONE
CHECK_OR_FALSE(_sub->fusedActivationFunction() == luci::FusedActFunc::NONE);
CHECK_OR_FALSE(_mul_alpha->fusedActivationFunction() == luci::FusedActFunc::NONE);
CHECK_OR_FALSE(_mul_half->fusedActivationFunction() == luci::FusedActFunc::NONE);
CHECK_OR_FALSE(_add_ofm->fusedActivationFunction() == luci::FusedActFunc::NONE);
// TODO support other types?
// check if _const_half is really FLOAT32 & 0.5
CHECK_OR_FALSE(_const_half->dtype() == loco::DataType::FLOAT32);
CHECK_OR_FALSE(_const_half->size<loco::DataType::FLOAT32>() == 1);
CHECK_OR_FALSE(_const_half->at<loco::DataType::FLOAT32>(0) == 0.5);
// check _const_alpha condition
CHECK_OR_FALSE(_const_alpha->dtype() == loco::DataType::FLOAT32);
// TODO add more if needed
return true;
}
#undef CHECK_OR_FALSE
class FusePRelu final
{
public:
FusePRelu(const PReluPattern &p) : _p(p) {}
public:
void apply(void);
private:
luci::CirclePRelu *create_prelu(loco::Graph *graph);
private:
const PReluPattern &_p;
};
luci::CirclePRelu *FusePRelu::create_prelu(loco::Graph *graph)
{
assert(graph);
auto prelu = graph->nodes()->create<luci::CirclePRelu>();
prelu->input(_p._ifm);
prelu->alpha(_p._const_alpha);
prelu->name(_p._add_ofm->name() + "_prelu");
return prelu;
}
void FusePRelu::apply()
{
auto graph = _p._add_ofm->graph();
auto prelu = create_prelu(graph);
// set origin
std::vector<std::shared_ptr<luci::CircleNodeOrigin>> origin_vec{
luci::get_origin(_p._relu), luci::get_origin(_p._abs), luci::get_origin(_p._sub),
luci::get_origin(_p._mul_alpha), luci::get_origin(_p._mul_half), luci::get_origin(_p._add_ofm)};
luci::add_origin(prelu, luci::composite_origin(origin_vec));
replace(_p._add_ofm).with(prelu);
}
} // namespace
namespace
{
bool fuse_prelu(luci::CircleAdd *add)
{
assert(add);
PReluPattern pattern(add);
if (pattern.matched())
{
FusePRelu fuse(pattern);
fuse.apply();
return true;
}
return false;
}
} // namespace
namespace luci
{
bool FusePReluPass::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 (not add)
continue;
if (fuse_prelu(add))
changed = true;
}
return changed;
}
} // namespace luci
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