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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/SubstituteStridedSliceToReshapePass.h"
#include <luci/IR/CircleNodes.h>
#include <luci/Profile/CircleNodeOrigin.h>
#include <bitset>
#include <vector>
/**
* @brief Convert strided_slice op in a certain condition to reshape op
* @details Convert strided_slice op if the op meets all of the following condition:
* For all i, 0 <= i < input.rank
* - begin[i] == 0
* - end[i] >= input.shape.dim[i]
* - strides[i] == 1
* For all k (0 <= k < input.rank) where kth bit of shrink_axis_mask == 1
* - end[k] == 1
*
* Example:
* input.shape = [1,1,2,3]
* strided_slice(input, begin=[0,0,0,0], end=[1,1,2,3], strides=[1,1,1,1],
* shrink_axis_mask=0011b) // k = 0, 1
*
* can be converted to
*
* reshape(input, [2,3])
*/
namespace
{
/**
* @brief Return newly-created CircleConst whose rank is 1
*/
luci::CircleConst *build_rank1_const(loco::Graph *graph, const std::vector<uint32_t> &values)
{
auto const_node = graph->nodes()->create<luci::CircleConst>();
const_node->dtype(loco::DataType::S32);
const_node->size<loco::DataType::S32>(values.size());
const_node->shape_status(luci::ShapeStatus::VALID);
const_node->rank(1);
const_node->dim(0) = values.size();
for (size_t i = 0; i < values.size(); i++)
{
const_node->at<loco::DataType::S32>(i) = values.at(i);
}
return const_node;
}
/**
* @brief Return newly-created CircleReshape node
*/
luci::CircleNode *build_reshape(loco::Graph *graph, const std::string &name,
const std::shared_ptr<luci::CircleNodeOrigin> &origin,
luci::CircleNode *input, const std::vector<uint32_t> &new_shape)
{
auto reshape_node = graph->nodes()->create<luci::CircleReshape>();
reshape_node->tensor(input);
reshape_node->name(name);
luci::add_origin(reshape_node, origin);
auto new_shape_const = build_rank1_const(graph, new_shape);
{
new_shape_const->name(name + "/new_shape");
luci::add_origin(new_shape_const, origin);
}
reshape_node->shape(new_shape_const);
return reshape_node;
}
/**
* @brief Return value in position on CircleConst with int64 format.
*/
int64_t value_from_circle_const(const luci::CircleConst *node, uint32_t idx)
{
assert(node->rank() == 1 && node->dim(0).value() > idx);
assert(node->dtype() == loco::DataType::S64 || node->dtype() == loco::DataType::S32);
if (node->dtype() == loco::DataType::S64)
return node->at<loco::DataType::S64>(idx);
return static_cast<int64_t>(node->at<loco::DataType::S32>(idx));
}
bool substitute_strided_slice_to_reshape(luci::CircleStridedSlice *ss_node)
{
if (ss_node->shrink_axis_mask() == 0)
return false;
// TODO Consider cases with ellipsis_mask and new_axis_mask
// NOT YET SUPPORTED
if (ss_node->ellipsis_mask() != 0 or ss_node->new_axis_mask() != 0)
return false;
auto begin_const = dynamic_cast<luci::CircleConst *>(ss_node->begin());
auto strides_const = dynamic_cast<luci::CircleConst *>(ss_node->strides());
auto end_const = dynamic_cast<luci::CircleConst *>(ss_node->end());
if (not(begin_const && strides_const && end_const))
return false;
auto input_node = loco::must_cast<luci::CircleNode *>(ss_node->input());
// condition check
std::bitset<32> begin_mask(ss_node->begin_mask());
std::bitset<32> end_mask(ss_node->end_mask());
std::bitset<32> shrink_axis_mask(ss_node->shrink_axis_mask());
uint32_t input_rank = input_node->rank();
for (uint32_t i = 0; i < input_rank; i++)
{
if (!input_node->dim(i).known())
return false;
auto begin_dim = value_from_circle_const(begin_const, i);
if (begin_dim != 0 and begin_mask.test(i) == false)
return false;
// NOTE:
// In Tensorflow and TFLite, e.g., if input_shape = [2,3],
// strided_slice.end = [10,20] (larger value than actual dim)
// is treated as strided_slice.end = [2,3]
int64_t end_dim = value_from_circle_const(end_const, i);
if (end_dim < input_node->dim(i).value() and end_mask.test(i) == false)
return false;
int64_t strides_value = value_from_circle_const(strides_const, i);
if (strides_value != 1)
return false;
if (shrink_axis_mask.test(i) && input_node->dim(i).value() != 1)
return false;
}
// build shape for Reshape op
bool found = false;
std::vector<uint32_t> shrunk_shape;
for (uint32_t i = 0; i < input_rank; i++)
{
if (input_node->dim(i) == 1 and shrink_axis_mask.test(i))
found = true;
else
shrunk_shape.emplace_back(input_node->dim(i).value());
}
if (not found)
return false;
auto reshape_node = build_reshape(input_node->graph(), ss_node->name(), luci::get_origin(ss_node),
input_node, shrunk_shape);
replace(ss_node).with(reshape_node);
return true;
}
} // namespace
namespace luci
{
/**
* BEFORE
* |
* [CircleNode] [CircleConst] [CircleConst] [CircleConst]
* | | | |
* -------+------------------------------------
* |
* [CircleStridedSlice]
* |
* [CircleNode]
* |
* AFTER
* |
* [CircleConst] [CircleNode] [CircleConst] [CircleConst] [CircleConst]
* \ / \ | | |
* [CircleReshape] -------------------+----------------------
* | |
* [CircleNode] [CircleStridedSlice]
* |
*/
bool SubstituteStridedSliceToReshapePass::run(loco::Graph *g)
{
bool changed = false;
for (auto node : loco::active_nodes(loco::output_nodes(g)))
{
if (auto circle_node = dynamic_cast<luci::CircleStridedSlice *>(node))
{
if (substitute_strided_slice_to_reshape(circle_node))
{
changed = true;
}
}
}
return changed;
}
} // namespace luci
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