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//
// Copyright © 2017 Arm Ltd. All rights reserved.
// SPDX-License-Identifier: MIT
//
#pragma once
#include "Optimization.hpp"
namespace armnn
{
namespace optimizations
{
template <typename Comparable>
class SquashEqualSiblingsImpl
{
public:
/// Run for every connection between a base Layer (any) and a child ComparableLayer.
/// For all siblings of the child layer that compare equal to it, bypasses and removes
/// them. I.e., moves the connections in the outputs of the siblings to the outputs of
/// the child layer, so the siblings are left unconnected (and later removed).
void Run(Graph& graph, InputSlot& connection) const
{
auto& child = connection.GetOwningLayer();
if (!child.IsOutputUnconnected())
{
OutputSlot& baseOutput = *connection.GetConnectedOutputSlot();
if (baseOutput.GetNumConnections() > 1)
{
auto& comparableChild = *boost::polymorphic_downcast<Comparable*>(&child);
Layer* lowestPriorityChild = &child;
for (auto&& it : baseOutput.GetConnections())
{
Layer* sibling = &it->GetOwningLayer();
if ((sibling != lowestPriorityChild) && comparableChild.IsEqual(*sibling))
{
if (sibling->GetPriority() < lowestPriorityChild->GetPriority())
{
std::swap(sibling, lowestPriorityChild);
}
// Bypasses sibling. It will be removed as it's left unconnected.
auto siblingOut = sibling->BeginOutputSlots();
for (auto lowestPriorityChildOut = lowestPriorityChild->BeginOutputSlots();
lowestPriorityChildOut != lowestPriorityChild->EndOutputSlots(); ++lowestPriorityChildOut)
{
siblingOut->MoveAllConnections(*lowestPriorityChildOut);
++siblingOut;
}
}
}
}
}
}
protected:
SquashEqualSiblingsImpl() = default;
~SquashEqualSiblingsImpl() = default;
};
using SquashEqualPermuteSiblings = OptimizeForConnection<Layer, PermuteLayer, SquashEqualSiblingsImpl<PermuteLayer>>;
using SquashEqualReshapeSiblings = OptimizeForConnection<Layer, ReshapeLayer, SquashEqualSiblingsImpl<ReshapeLayer>>;
} // namespace optimizations
} // namespace armnn
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