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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 "CopyLowering.h"
#include "IRUtils.h"
#include <nncc/core/ADT/tensor/IndexEnumerator.h>
#include <set>
#include <cassert>
using namespace nncc::core::ADT;
namespace
{
inline uint32_t as_tensor_axis(const coco::ConcatF::Axis &axis)
{
switch (axis)
{
case coco::ConcatF::Axis::Batch:
return 0;
case coco::ConcatF::Axis::Depth:
return 1;
case coco::ConcatF::Axis::Height:
return 2;
case coco::ConcatF::Axis::Width:
return 3;
default:
break;
};
throw std::invalid_argument{"axis is unknown value"};
}
tensor::Shape as_tensor_shape(const coco::FeatureLayout *l)
{
assert(l != nullptr);
tensor::Shape res;
res.resize(4);
res.dim(as_tensor_axis(coco::ConcatF::Axis::Batch)) = l->batch();
res.dim(as_tensor_axis(coco::ConcatF::Axis::Depth)) = l->depth();
res.dim(as_tensor_axis(coco::ConcatF::Axis::Height)) = l->height();
res.dim(as_tensor_axis(coco::ConcatF::Axis::Width)) = l->width();
return res;
}
coco::ElemID as_element_index(const coco::FeatureLayout *l, const tensor::Index &idx)
{
assert(l != nullptr);
assert(idx.rank() == 4);
const auto b = idx.at(as_tensor_axis(coco::ConcatF::Axis::Batch));
const auto ch = idx.at(as_tensor_axis(coco::ConcatF::Axis::Depth));
const auto row = idx.at(as_tensor_axis(coco::ConcatF::Axis::Height));
const auto col = idx.at(as_tensor_axis(coco::ConcatF::Axis::Width));
return l->at(b, ch, row, col);
}
std::set<coco::Eval *> candidates(coco::Module *m)
{
std::set<coco::Eval *> res;
for (auto ins : enco::instr_sequence(m))
{
if (auto eval = ins->asEval())
{
if (eval->op()->asConcatF())
{
res.insert(eval);
}
}
}
return res;
}
} // namespace
namespace enco
{
void lower_concat(enco::Code *code)
{
auto m = code->module();
for (auto eval : candidates(m))
{
auto concat_f = eval->op()->asConcatF();
assert(concat_f != nullptr);
auto left_feature = concat_f->left()->asLoad()->object()->asFeature();
assert(left_feature != nullptr);
auto left_shape = as_tensor_shape(left_feature->layout());
auto right_feature = concat_f->right()->asLoad()->object()->asFeature();
assert(right_feature != nullptr);
auto right_shape = as_tensor_shape(right_feature->layout());
auto out_feature = eval->out()->asFeature();
assert(out_feature != nullptr);
auto out_shape = as_tensor_shape(out_feature->layout());
auto concat_axe = as_tensor_axis(concat_f->axis());
// Lower: Left -> Output
{
auto src_feature = left_feature;
auto src_shape = left_shape;
auto ins = m->entity()->instr()->create<coco::Shuffle>();
assert(src_feature->bag() != nullptr);
assert(out_feature->bag() != nullptr);
ins->from(src_feature->bag());
ins->into(out_feature->bag());
for (tensor::IndexEnumerator e{src_shape}; e.valid(); e.advance())
{
tensor::Index src_index = e.current();
tensor::Index out_index = e.current();
auto from = as_element_index(src_feature->layout(), src_index);
auto into = as_element_index(out_feature->layout(), out_index);
ins->insert(from, into);
}
ins->insertAfter(eval);
}
// Lower: Right -> Output
{
auto src_feature = right_feature;
auto src_shape = right_shape;
auto ins = m->entity()->instr()->create<coco::Shuffle>();
assert(src_feature->bag() != nullptr);
assert(out_feature->bag() != nullptr);
ins->from(src_feature->bag());
ins->into(out_feature->bag());
for (tensor::IndexEnumerator e{src_shape}; e.valid(); e.advance())
{
tensor::Index src_index = e.current();
tensor::Index out_index = e.current();
out_index.at(concat_axe) = out_index.at(concat_axe) + left_shape.dim(concat_axe);
auto from = as_element_index(src_feature->layout(), src_index);
auto into = as_element_index(out_feature->layout(), out_index);
ins->insert(from, into);
}
ins->insertAfter(eval);
}
// Unlink "Eval" and "ConcatF" op tree
eval->op(nullptr);
// Delete "Concat" op tree
m->entity()->op()->destroy(concat_f->left());
m->entity()->op()->destroy(concat_f->right());
m->entity()->op()->destroy(concat_f);
// Deatch "Eval" instruction from the block
eval->detach();
// Delete "Eval" instruction
m->entity()->instr()->destroy(eval);
}
}
} // namespace enco
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