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/*
* Copyright (c) 2022 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/FoldGatherPass.h"
#include "CircleOptimizerUtils.h"
#include <luci/IR/CircleNodes.h>
namespace
{
/**
* Fold to const if
*
* 1. params: const and dtype = S32 or S64
* 2. indices: const and dtype = S32 or S64
*
* BEFORE
*
* [CircleConst] [CircleConst]
* | |
* +---------[Gather]---------+
*
* AFTER
*
* [CircleConst]
*
**/
template <loco::DataType InputT, loco::DataType IndexT>
bool fold_gather(luci::CircleGather *gather_node)
{
const auto params = loco::must_cast<luci::CircleConst *>(gather_node->params());
const auto indices = loco::must_cast<luci::CircleConst *>(gather_node->indices());
const auto rank = params->rank();
auto axis = gather_node->axis();
if (axis < 0)
{
axis += static_cast<int32_t>(rank);
}
if (axis < 0 or axis >= static_cast<int32_t>(rank))
throw std::runtime_error("Unsupported axis value");
const auto name = gather_node->name();
assert(name.length() > 0);
auto constant = gather_node->graph()->nodes()->create<luci::CircleConst>();
constant->dtype(InputT);
constant->name(name + "_folded");
constant->rank(rank + indices->rank() - 1);
assert(constant->rank() > 0);
std::vector<uint32_t> shape;
for (uint32_t i = 0; i < rank; ++i)
{
if (i != static_cast<uint32_t>(axis))
{
const auto dim = params->dim(i).value();
shape.push_back(dim);
}
else
{
for (uint32_t j = 0; j < indices->rank(); ++j)
{
const auto dim = indices->dim(j).value();
shape.push_back(dim);
}
}
}
uint32_t size = 1;
for (uint32_t i = 0; i < shape.size(); ++i)
{
constant->dim(i).set(shape.at(i));
size *= shape.at(i);
}
constant->size<InputT>(size);
uint32_t outer_size = 1;
for (uint32_t i = 0; i < static_cast<uint32_t>(axis); ++i)
{
outer_size *= params->dim(i).value();
}
uint32_t inner_size = 1;
for (uint32_t i = axis + 1; i < rank; ++i)
{
inner_size *= params->dim(i).value();
}
uint32_t coord_size = 1;
for (uint32_t i = 0; i < indices->rank(); ++i)
{
coord_size *= indices->dim(i).value();
}
const auto axis_size = params->dim(axis).value();
for (uint32_t outer = 0; outer < outer_size; ++outer)
{
for (uint32_t i = 0; i < coord_size; ++i)
{
constant->at<InputT>((outer * coord_size + i) * inner_size) =
params->at<InputT>((outer * axis_size + indices->at<IndexT>(i)) * inner_size);
}
}
loco::replace(gather_node).with(constant);
return true;
}
bool fold_gather(luci::CircleGather *gather_node)
{
const auto params = dynamic_cast<luci::CircleConst *>(gather_node->params());
if (not params)
return false;
const auto indices = dynamic_cast<luci::CircleConst *>(gather_node->indices());
if (not indices)
return false;
// TODO: support more types
if (params->dtype() != loco::DataType::S32 and params->dtype() != loco::DataType::S64)
return false;
if (indices->dtype() != loco::DataType::S32 and indices->dtype() != loco::DataType::S64)
throw std::runtime_error("Unsupported type");
if (params->dtype() == loco::DataType::S64)
{
if (indices->dtype() == loco::DataType::S64)
return fold_gather<loco::DataType::S64, loco::DataType::S64>(gather_node);
else
return fold_gather<loco::DataType::S64, loco::DataType::S32>(gather_node);
}
else
{
if (indices->dtype() == loco::DataType::S64)
return fold_gather<loco::DataType::S32, loco::DataType::S64>(gather_node);
else
return fold_gather<loco::DataType::S32, loco::DataType::S32>(gather_node);
}
}
} // namespace
namespace luci
{
/**
* Constant Folding for Gather Op
**/
bool FoldGatherPass::run(loco::Graph *g)
{
bool changed = false;
for (auto node : loco::active_nodes(loco::output_nodes(g)))
{
if (auto gather_node = dynamic_cast<luci::CircleGather *>(node))
{
if (fold_gather(gather_node))
changed = true;
}
}
return changed;
}
} // namespace luci
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