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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/FuseTransposeWithMeanPass.h"
#include <luci/IR/CircleNode.h>
#include <luci/Profile/CircleNodeOrigin.h>
#include <luci/Service/Nodes/CircleConst.h>
namespace
{
/**
* Fuse Transpose with Mean if possible
*
* BEFORE
* |
* [CircleTranspose, perm<0, 2, 3, 1>]
* |
* [CircleMean, axis<3>]
* |
*
* AFTER
* | |
* [CircleMean, axis<1>] [CircleTranspose, perm<0, 2, 3, 1>]
* | |
* [CircleMean, axis<3>]
*
*/
/**
* @brief Create a const for fused reduction indices
*/
luci::CircleConst *create_fused_indices(luci::CircleConst *rindices,
const std::vector<uint32_t> &fused_rindices)
{
assert(rindices != nullptr); // FIX_CALLER_UNLESS
if (rindices->dtype() != loco::DataType::S32)
return nullptr;
assert(fused_rindices.size() == rindices->size<loco::DataType::S32>());
auto fused_rindices_const = luci::clone(rindices);
auto name = rindices->name();
assert(name.length() > 0); // FIX_CALLER_UNLESS
fused_rindices_const->name(name + "_fused");
for (uint32_t i = 0; i < fused_rindices.size(); ++i)
{
fused_rindices_const->at<loco::DataType::S32>(i) = fused_rindices.at(i);
}
return fused_rindices_const;
}
bool const_has_value_s32(const luci::CircleConst *circle_const, int32_t value)
{
if (circle_const->dtype() != loco::DataType::S32)
return false;
uint32_t size = circle_const->size<loco::DataType::S32>();
for (uint32_t i = 0; i < size; ++i)
{
if (circle_const->at<loco::DataType::S32>(i) == value)
return true;
}
return false;
}
bool fuse_transpose_with_mean(luci::CircleMean *mean)
{
auto transpose = dynamic_cast<luci::CircleTranspose *>(mean->input());
if (not transpose)
return false;
// Get reduction indices of CircleMean operation.
auto rindices = dynamic_cast<luci::CircleConst *>(mean->reduction_indices());
if (not rindices)
return false;
if (rindices->dtype() != loco::DataType::S32)
return false;
if (mean->keep_dims() != false)
return false;
auto perm = dynamic_cast<luci::CircleConst *>(transpose->perm());
if (not perm)
return false;
std::vector<uint32_t> axes_after_reduction;
std::vector<uint32_t> orig_reduced_axes;
for (uint32_t axis = 0; axis < perm->size<loco::DataType::S32>(); ++axis)
{
uint32_t original_axis = static_cast<uint32_t>(perm->at<loco::DataType::S32>(axis));
if (const_has_value_s32(rindices, axis))
{
orig_reduced_axes.push_back(original_axis);
continue;
}
axes_after_reduction.push_back(original_axis);
}
if (not std::is_sorted(axes_after_reduction.begin(), axes_after_reduction.end()))
return false;
auto fused_rindices = create_fused_indices(rindices, orig_reduced_axes);
if (not fused_rindices)
return false;
// Create and configure new CircleMean operation.
auto fused_mean = mean->graph()->nodes()->create<luci::CircleMean>();
fused_mean->reduction_indices(fused_rindices);
fused_mean->input(transpose->a());
fused_mean->keep_dims(false);
fused_mean->name(mean->name() + "/Transpose");
// Replace old CircleMean operation with new CircleMean operation with merged indices.
replace(mean).with(fused_mean);
luci::add_origin(fused_mean,
luci::composite_origin({luci::get_origin(mean), luci::get_origin(transpose)}));
return true;
}
} // namespace
namespace luci
{
bool FuseTransposeWithMeanPass::run(loco::Graph *g)
{
bool changed = false;
for (auto node : loco::active_nodes(loco::output_nodes(g)))
{
auto mean = dynamic_cast<luci::CircleMean *>(node);
if (not mean)
continue;
if (fuse_transpose_with_mean(mean))
changed = true;
}
return changed;
}
} // namespace luci
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