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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 "ReluCanonicalizer.h"
#include "Dialect/TFDialect.h"
#include "Dialect/TFNodes.h"
#include "Dialect/TFNodeVisitor.h"
#include "Dialect/TFNodeImpl.h"
#include <stdex/Memory.h>
namespace
{
bool canonicalize_relu(loco::Graph *graph, moco::tf::TFRelu *node)
{
/**
* @note This will replace TFRelu node with Canonical ReLU
*
* Before
* A --- TFRelu -- C
* After
* +- TFRelu --
* |
* A -+- ReLU -- C
*
* Where
* A : features of TFRelu
* C : a node that uses TFRelu as an input
* TFRelu is disconnected from C
*/
auto relu_node = graph->nodes()->create<loco::ReLU>();
auto node_A = node->features();
// update connections
relu_node->input(node_A);
// replace node
replace(node).with(relu_node);
return true;
}
} // namespace
namespace moco
{
namespace tf
{
bool ReluCanonicalizer::run(loco::Graph *graph)
{
auto active_nodes = loco::active_nodes(loco::output_nodes(graph));
bool changed = false;
for (auto node : active_nodes)
{
if (node->dialect() == TFDialect::get())
{
auto tf_node = dynamic_cast<moco::tf::TFRelu *>(node);
if (tf_node != nullptr)
{
if (canonicalize_relu(graph, tf_node))
changed = true;
}
}
}
return changed;
}
} // namespace tf
} // namespace moco
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