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/*
* Copyright (c) 2018 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 "AvgPoolLowering.h"
#include "IRUtils.h"
#include <coco/IR/FeatureLayouts.h>
#include <nncc/core/ADT/feature/Shape.h>
#include <nncc/core/ADT/feature/HWCLayout.h>
#include <set>
#include <cassert>
using namespace nncc::core::ADT;
using nncc::core::ADT::feature::num_elements;
namespace
{
bool empty(coco::Padding2D *pad)
{
return (pad->top() == 0) && (pad->bottom() == 0) && (pad->left() == 0) && (pad->right() == 0);
}
/**
* @brief Return a set of AvgPool2D operations (in Eval instruction) that SHOULD be lowered
*/
std::set<coco::AvgPool2D *> candidates(coco::Module *m)
{
std::set<coco::AvgPool2D *> res;
for (auto I : enco::instr_sequence(m))
{
if (auto eval = I->asEval())
{
if (auto avgpool = eval->op()->asAvgPool2D())
{
/* Originally it was preferred to use `auto load = avgpool->arg()->asLoad()' for
* consitent style with other if statements.
* Someone may think compiler will be happy because `load` in `if` statement can
* be considered as a use, however, it turend out that it is not the case.
*/
if (avgpool->arg()->asLoad())
{
if (avgpool->divisor() == coco::AvgPool2D::Divisor::Static)
{
res.insert(avgpool);
}
}
}
}
}
return res;
}
} // namespace
namespace
{
namespace ShapeTransform
{
class Pad
{
public:
Pad(const coco::Padding2D *pad) : _pad{pad}
{
// DO NOTHING
}
public:
/// @brief Return the expected OFM shape for a given IFM shape
feature::Shape forward(const feature::Shape &ifm_shape) const
{
const uint32_t OFM_C = ifm_shape.depth();
const uint32_t OFM_H = ifm_shape.height() + _pad->top() + _pad->bottom();
const uint32_t OFM_W = ifm_shape.width() + _pad->left() + _pad->right();
return feature::Shape{OFM_C, OFM_H, OFM_W};
}
private:
const coco::Padding2D *_pad;
};
} // namespace ShapeTransform
ShapeTransform::Pad shape_xform(const coco::Padding2D *pad) { return ShapeTransform::Pad{pad}; }
} // namespace
namespace
{
class PadInstrBuilder final
{
public:
PadInstrBuilder(const coco::Padding2D *pad) : _pad{pad}
{
// DO NOTHING
}
public:
coco::Instr *build(coco::FeatureObject *ifm_obj, coco::FeatureObject *ofm_obj) const
{
assert(ifm_obj->module() == ofm_obj->module());
auto m = ifm_obj->module();
assert(m != nullptr);
auto load_op = m->entity()->op()->create<coco::Load>();
load_op->object(ifm_obj);
auto pad_op = m->entity()->op()->create<coco::PadF>();
pad_op->arg(load_op);
pad_op->pad()->top(_pad->top());
pad_op->pad()->bottom(_pad->bottom());
pad_op->pad()->left(_pad->left());
pad_op->pad()->right(_pad->right());
auto pad_instr = m->entity()->instr()->create<coco::Eval>();
pad_instr->out(ofm_obj);
pad_instr->op(pad_op);
return pad_instr;
}
private:
const coco::Padding2D *_pad;
};
PadInstrBuilder pad_instr_builder(const coco::Padding2D *pad) { return PadInstrBuilder{pad}; }
} // namespace
namespace
{
class AvgPoolRewritePass
{
private:
void runOnModule(coco::Module *m) const;
public:
void runOnCode(enco::Code *) const;
};
void AvgPoolRewritePass::runOnModule(coco::Module *m) const
{
// Lower AvgPool2D op that resides in Eval instruction
for (auto avgpool : candidates(m))
{
auto ins = avgpool->parent();
auto load = avgpool->arg()->asLoad();
assert(ins != nullptr);
assert(load != nullptr);
assert(avgpool->divisor() == coco::AvgPool2D::Divisor::Static);
if (empty(avgpool->pad()))
{
// NOTE If there is no padding, Static and PaddingExcluded schemes are equivalent
avgpool->divisor(coco::AvgPool2D::Divisor::PaddingExcluded);
}
else
{
// Before: Static AvgPool2D with Padding
// After: PadF; PaddingExcluded AvgPool2D without Padding
// Create PadF
auto ifm_obj = load->object()->asFeature();
assert(ifm_obj != nullptr);
auto pad_shape = shape_xform(avgpool->pad()).forward(ifm_obj->shape());
auto pad_bag = m->entity()->bag()->create(num_elements(pad_shape));
auto pad_obj = m->entity()->object()->create<coco::FeatureObject>();
pad_obj->bag(pad_bag);
pad_obj->layout(coco::FeatureLayouts::BHWC::create(pad_shape));
auto pad_instr = pad_instr_builder(avgpool->pad()).build(ifm_obj, pad_obj);
// Insert PadF before AvgPool2D
pad_instr->insertBefore(ins);
// Rewrite AvgPool2D as PaddingExcluded AvgPool2D without Padding
load->object(pad_obj);
avgpool->divisor(coco::AvgPool2D::Divisor::PaddingExcluded);
avgpool->pad()->top(0);
avgpool->pad()->bottom(0);
avgpool->pad()->left(0);
avgpool->pad()->right(0);
}
}
}
void AvgPoolRewritePass::runOnCode(enco::Code *code) const { runOnModule(code->module()); }
} // namespace
namespace enco
{
void lower_avgpool(enco::Code *code)
{
AvgPoolRewritePass pass;
pass.runOnCode(code);
}
} // namespace enco
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