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/*
* Copyright (c) 2021 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/SubstituteSqueezeToReshapePass.h"
#include <luci/IR/CircleNodes.h>
#include <luci/Profile/CircleNodeOrigin.h>
namespace
{
/**
* @brief return TRUE if all dim is known
* @note This pass can be applied even some of dimensions are unknown.
For now, do not consider about it and update logic later.
*/
bool can_squeeze_shape(const luci::CircleNode *node)
{
for (uint32_t r = 0; r < node->rank(); ++r)
{
if (not node->dim(r).known())
return false;
}
return true;
}
/**
* @brief return valid unsigned dim value from 0 ~ (rank-1)
* @note dim can be -rank to (rank-1)
*/
uint32_t valid_unsigned_dim(uint32_t rank, int32_t dim)
{
int32_t irank = static_cast<int32_t>(rank);
return dim >= 0 ? static_cast<uint32_t>(dim) : static_cast<uint32_t>(irank + dim);
}
/**
* @brief return TRUE if input dim is 1 for squeeze_dims values
*/
bool is_valid_input(const luci::CircleNode *node, const std::vector<int32_t> &squeeze_dims)
{
auto rank = node->rank();
for (auto dim : squeeze_dims)
{
auto udim = valid_unsigned_dim(rank, dim);
if (node->dim(udim).value() != 1)
return false;
}
return true;
}
/**
* @brief return shape vector from input
*/
std::vector<uint32_t> node_shape(const luci::CircleNode *input)
{
std::vector<uint32_t> shape;
uint32_t rank = input->rank();
for (uint32_t r = 0; r < rank; ++r)
shape.push_back(input->dim(r).value());
return shape;
}
/**
* @brief copy quantparam of src to dst
*/
void copy_quantparam(luci::CircleNode *dst, const luci::CircleNode *src)
{
auto q = src->quantparam();
if (q == nullptr)
dst->quantparam(nullptr);
else
dst->quantparam(std::make_unique<luci::CircleQuantParam>(*q));
}
/**
* @brief return CircleConst ptr with values of new_shape
*/
luci::CircleConst *create_shape_const(loco::Graph *graph, const std::vector<uint32_t> &new_shape)
{
// NOTE dim_size can be 0
uint32_t dim_size = static_cast<uint32_t>(new_shape.size());
auto shape_const = graph->nodes()->create<luci::CircleConst>();
// const shape/dtype
shape_const->dtype(loco::DataType::S32);
if (dim_size > 0)
{
shape_const->rank(1);
shape_const->dim(0).set(dim_size);
}
else
shape_const->rank(0);
shape_const->shape_status(luci::ShapeStatus::VALID);
// constant values
shape_const->size<loco::DataType::S32>(dim_size);
for (uint32_t i = 0; i < dim_size; ++i)
shape_const->at<loco::DataType::S32>(i) = new_shape.at(i);
return shape_const;
}
bool substitute_squeeze_to_reshape(luci::CircleSqueeze *squeeze)
{
assert(squeeze != nullptr);
auto input = loco::must_cast<luci::CircleNode *>(squeeze->input());
// we need input node shape and all dim should be known
if (input->shape_status() != luci::ShapeStatus::VALID)
return false;
if (not can_squeeze_shape(input))
return false;
// we will use squeeze shape for new shape
if (squeeze->shape_status() != luci::ShapeStatus::VALID)
return false;
auto squeeze_dims = squeeze->squeeze_dims();
if (not is_valid_input(input, squeeze_dims))
throw std::runtime_error("Invalid values in squeeze_dims: " + squeeze->name());
auto name = squeeze->name();
assert(name.length() > 0);
auto reshape_shape = node_shape(squeeze);
auto graph = squeeze->graph();
auto reshape = graph->nodes()->create<luci::CircleReshape>();
auto shape_const = create_shape_const(graph, reshape_shape);
copy_quantparam(reshape, squeeze);
reshape->name(name + "/Reshape");
luci::add_origin(reshape, luci::get_origin(squeeze));
shape_const->name(name + "/Reshape/shape");
// graph connection
reshape->tensor(input);
reshape->shape(shape_const);
replace(squeeze).with(reshape);
return true;
}
} // namespace
namespace luci
{
/**
* BEFORE
* |
* [CircleNode]
* |
* [CircleSqueeze]
* |
* [CircleNode]
* |
*
* AFTER
* |
* [CircleNode] [CircleConst]
* | \ /
* [CircleSqueeze] [CircleReshape]
* |
* [CircleNode]
* |
*/
bool SubstituteSqueezeToReshapePass::run(loco::Graph *g)
{
bool changed = false;
for (auto node : loco::active_nodes(loco::output_nodes(g)))
{
if (auto squeeze = dynamic_cast<luci::CircleSqueeze *>(node))
{
if (substitute_squeeze_to_reshape(squeeze))
changed = true;
}
}
return changed;
}
} // namespace luci
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