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//
// Copyright © 2017 Arm Ltd. All rights reserved.
// SPDX-License-Identifier: MIT
//
#pragma once
#include "Optimization.hpp"
#include <boost/core/ignore_unused.hpp>
namespace armnn
{
namespace optimizations
{
class OptimizeInversePermutesImpl
{
public:
/// Run for every connection between a base PermuteLayer and a child PermuteLayer.
/// Bypasses both layers for that connection if one is the inverse of the other.
void Run(Graph& graph, InputSlot& connection) const
{
boost::ignore_unused(graph);
Layer& base = connection.GetConnectedOutputSlot()->GetOwningLayer();
auto child = boost::polymorphic_downcast<PermuteLayer*>(&connection.GetOwningLayer());
if (child->IsInverse(*boost::polymorphic_downcast<PermuteLayer*>(&base)))
{
// Bypass both layers. Child will be removed as it's left unconnected.
// Base layer will be removed if left unconnected.
child->GetOutputSlot().MoveAllConnections(*base.GetInputSlot(0).GetConnectedOutputSlot());
}
}
protected:
OptimizeInversePermutesImpl() = default;
~OptimizeInversePermutesImpl() = default;
};
using OptimizeInversePermutes = OptimizeForConnection<PermuteLayer, PermuteLayer, OptimizeInversePermutesImpl>;
} // namespace optimizations
} // namespace armnn
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