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/*
* Copyright (c) 2019 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 "MergeConcatNodesPass.h"
#include "Dialect/IR/TFLNodes.h"
#include <oops/InternalExn.h>
#include <vector>
namespace
{
bool canMerge(locoex::TFLConcatenation *node1, locoex::TFLConcatenation *node2)
{
if (node1->fusedActivationFunction() != node2->fusedActivationFunction())
return false;
if (node1->axis() != node2->axis())
return false;
switch (node1->fusedActivationFunction())
{
case locoex::FusedActFunc::NONE:
case locoex::FusedActFunc::RELU:
case locoex::FusedActFunc::RELU6:
return true;
// case locoex::FusedActFunc::TANH:
// return false;
default:
INTERNAL_EXN_V("Unknown FusedActFunc", oops::to_uint32(node1->fusedActivationFunction()));
}
}
/**
* @brief Collect all the inputs of newly created TFLConcatenation nodes
*
* in:0 -------------------------------\
* in:1 ---- TFLConcatenation:0 -------- TFLConcatenation:3 --- C
* (axis = 0, NONE) (axis = 0, NONE)
* in:2 ---/ /
* in:3 ---- TFLConcatenation:1 ------/
* (axis = 1, NONE) /
* in:4 ---/ /
* in:5 ---- TFLConcatenation:2 ---/
* (axis = 0, RELU)
* in:6 ---/
*
* For exmaple, if graph is like above, dfs(TFLConcatenation:3) will
* return [in:0, in:1, in:2, TFLConcatenation:1, TFLConcatenation:2]
*
* TFLConcatenation:0 can be merged to TFLConcatenation:3,
* because axis and fusedActivationFunction are same.
* It means that [in:1, in:2] will be linked as inputs of new TFLConcatenation.
*
* However, TFLConcatenation:1 and TFLConcatenation:2 cannot be merged to
* TFLConcatenation:3 because axis and fusedActivationFunction of each are different.
* So [in:3, in:4, in:5, in:6] will not be linked as inputs of new TFLConcatenation
* and [TFLConcatenation:1, TFLConcatenation:2] will be linked instead.
*
* Therefore, inputs of newly created TFLConcatenation node for merging
* TFLConcatenation:3 will be [in:0, in:1, in:2, TFLConcatenation:1, TFLConcatenation:2]
* and dfs(TFLConcatenation:3) will return it.
*
*
* @note The input nodes should be traversed by LRV,
* which is from left to right (input:0 --> input:N)
*/
std::vector<loco::Node *> dfs(locoex::TFLConcatenation *root)
{
std::vector<loco::Node *> res;
for (uint32_t i = 0; i < root->numValues(); ++i)
{
auto input = dynamic_cast<locoex::TFLConcatenation *>(root->values(i));
if (input != nullptr && canMerge(input, root))
{
auto children = dfs(input);
for (auto child : children)
res.push_back(child);
}
else
{
res.push_back(root->values(i));
}
}
return res;
}
} // namespace
namespace exo
{
/**
* @brief Merge TFLConcatenate nodes whose axis and fusedActivationFunction are same
*
* [Before]
* in:0 -------------------------------\
* in:1 ---- TFLConcatenation:0 -------- TFLConcatenation:3 --- C
* (axis = 0, NONE) (axis = 0, NONE)
* in:2 ---/ /
* in:3 ---- TFLConcatenation:1 ------/
* (axis = 1, NONE) /
* in:4 ---/ /
* in:5 ---- TFLConcatenation:2 ---/
* (axis = 0, RELU)
* in:6 ---/
*
* [After]
* in:0 -------------------------------\
* in:1 -------------------------------- TFLConcatenation:4 --- C
* (axis = 0, NONE)
* in:2 -------------------------------/
* in:3 ---- TFLConcatenation:1 ------/
* (axis = 1, NONE) /
* in:4 ---/ /
* in:5 ---- TFLConcatenation:2 ---/
* (axis = 0, RELU)
* in:6 ---/
*
*
* in:1 ---- TFLConcatenation:0 ----
* (axis = 0, NONE)
* in:2 ---/
*
*
* ---- TFLConcatenation:3 ----
* (axis = 0, NONE)
*/
bool MergeConcatNodesPass::run(loco::Graph *graph)
{
// Let's enumerate nodes required to compute output nodes
auto active_nodes = loco::active_nodes(loco::output_nodes(graph));
// Find TFLConcatenation nodes which have another TFLConcatenation nodes
// as inputs, with same axis and same fusedActivationFunction
std::vector<locoex::TFLConcatenation *> candidates;
for (auto node : active_nodes)
{
if (auto concat = dynamic_cast<locoex::TFLConcatenation *>(node))
{
for (uint32_t i = 0; i < concat->numValues(); ++i)
{
auto input = dynamic_cast<locoex::TFLConcatenation *>(concat->values(i));
if (input != nullptr && canMerge(input, concat))
{
candidates.push_back(concat);
break;
}
}
}
}
// Merge multiple TFLConcatenation nodes as one TFLConcatenation node
for (auto node : candidates)
{
auto inputs = dfs(node);
auto new_concat = graph->nodes()->create<locoex::TFLConcatenation>(inputs.size());
new_concat->axis(node->axis());
new_concat->fusedActivationFunction(node->fusedActivationFunction());
for (uint32_t i = 0; i < inputs.size(); ++i)
new_concat->values(i, inputs.at(i));
loco::replace(node).with(new_concat);
for (uint32_t i = 0; i < node->numValues(); ++i)
node->values(i, nullptr);
}
return candidates.size() > 0;
}
} // namespace exo
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