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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 "TensorBroadcastConverter.h"
#include "Dialect/IR/TFLDialect.h"
#include "Dialect/IR/TFLNodeVisitor.h"
#include <loco.h>
#include <loco/IR/CanonicalDialect.h>
#include <loco/IR/CanonicalNode.h>
#include <set>
namespace
{
template <class T> loco::TensorBroadcast *input_as_tbc(T *node)
{
loco::TensorBroadcast *tbc = dynamic_cast<loco::TensorBroadcast *>(node->x());
if (tbc == nullptr)
tbc = dynamic_cast<loco::TensorBroadcast *>(node->y());
return tbc;
}
struct Collector final : public locoex::TFLNodeMutableVisitor<void>
{
using NodePair = std::pair<loco::TensorBroadcast *, loco::Node *>;
void visit(locoex::TFLAdd *node) final
{
if (auto tbc = input_as_tbc<locoex::TFLAdd>(node))
{
NodePair pair(tbc, node);
candidates.insert(pair);
}
}
// TODO ADD TFLDiv
// TODO ADD TFLMul
// TODO ADD TFLSub
void visit(locoex::TFLNode *) final { return; }
std::set<NodePair> candidates;
};
bool mapping_condition(Collector::NodePair &)
{
// TODO fill condition
return true;
}
template <class T> void jump_connection(loco::TensorBroadcast *tbc, T *tflnode)
{
if (tflnode->x() == tbc)
tflnode->x(tbc->input());
else if (tflnode->y() == tbc)
tflnode->y(tbc->input());
else
assert(false);
tbc->input(nullptr);
}
} // namespace
namespace exo
{
/**
* @brief Disconnects loco::TensorBroadcast from the graph if following node
* is one of binary node: TFLAdd, TFLSub, TFLMul, TFLDiv
* and meets condition (TBA)
* @note
* Before:
* x --- TensorBroadcast --- TFLXXX --- output
* y ----------------------/
*
* After:
* --- TensorBroadcast ---
* x --- TFLXXX --- output
* y --/
*/
bool TensorBroadcastConverter::run(loco::Graph *graph)
{
Collector collector;
auto active_nodes = loco::active_nodes(loco::output_nodes(graph));
for (auto node : active_nodes)
{
if (node->dialect() == locoex::TFLDialect::get())
{
auto tfl_node = dynamic_cast<locoex::TFLNode *>(node);
tfl_node->accept(&collector);
}
}
bool changed = false;
for (auto pair : collector.candidates)
{
if (mapping_condition(pair))
{
loco::TensorBroadcast *tensorbroadcast = pair.first;
if (auto tfladd = dynamic_cast<locoex::TFLAdd *>(pair.second))
{
jump_connection<locoex::TFLAdd>(tensorbroadcast, tfladd);
changed = true;
}
// TODO ADD TFLDiv
// TODO ADD TFLMul
// TODO ADD TFLSub
else
{
assert(false);
}
}
}
return changed;
}
} // namespace exo
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