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// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.
// Copyright (C) 2020, Intel Corporation, all rights reserved.
// Third party copyrights are property of their respective owners.
#ifndef __OPENCV_DNN_GRAPH_SIMPLIFIER_HPP__
#define __OPENCV_DNN_GRAPH_SIMPLIFIER_HPP__
#include <string>
#include <opencv2/core.hpp>
namespace cv { namespace dnn {
class ImportNodeWrapper
{
public:
virtual ~ImportNodeWrapper() {}
virtual int getNumInputs() const = 0;
virtual std::string getInputName(int idx) const = 0;
virtual std::string getType() const = 0;
virtual void setType(const std::string& type) = 0;
virtual void setInputNames(const std::vector<std::string>& inputs) = 0;
};
class ImportGraphWrapper
{
public:
virtual ~ImportGraphWrapper() {}
virtual Ptr<ImportNodeWrapper> getNode(int idx) const = 0;
virtual int getNumNodes() const = 0;
virtual int getNumOutputs(int nodeId) const = 0;
virtual std::string getOutputName(int nodeId, int outId) const = 0;
virtual void removeNode(int idx) = 0;
virtual bool isCommutativeOp(const std::string& type) const = 0;
};
class Subgraph // Interface to match and replace subgraphs.
{
public:
virtual ~Subgraph();
// Add a node to be matched in the origin graph. Specify ids of nodes that
// are expected to be inputs. Returns id of a newly added node.
// TODO: Replace inputs to std::vector<int> in C++11
int addNodeToMatch(const std::string& op, int input_0 = -1, int input_1 = -1,
int input_2 = -1, int input_3 = -1);
int addNodeToMatch(const std::string& op, const std::vector<int>& inputs_);
// Specify resulting node. All the matched nodes in subgraph excluding
// input nodes will be fused into this single node.
// TODO: Replace inputs to std::vector<int> in C++11
void setFusedNode(const std::string& op, int input_0 = -1, int input_1 = -1,
int input_2 = -1, int input_3 = -1, int input_4 = -1,
int input_5 = -1);
void setFusedNode(const std::string& op, const std::vector<int>& inputs_);
static int getInputNodeId(const Ptr<ImportGraphWrapper>& net,
const Ptr<ImportNodeWrapper>& node,
int inpId);
// Match TensorFlow subgraph starting from <nodeId> with a set of nodes to be fused.
// Const nodes are skipped during matching. Returns true if nodes are matched and can be fused.
virtual bool match(const Ptr<ImportGraphWrapper>& net, int nodeId,
std::vector<int>& matchedNodesIds);
// Fuse matched subgraph.
void replace(const Ptr<ImportGraphWrapper>& net, const std::vector<int>& matchedNodesIds);
virtual void finalize(const Ptr<ImportGraphWrapper>& net,
const Ptr<ImportNodeWrapper>& fusedNode,
std::vector<Ptr<ImportNodeWrapper> >& inputs);
private:
std::vector<std::string> nodes; // Nodes to be matched in the origin graph.
std::vector<std::vector<int> > inputs; // Connections of an every node to it's inputs.
std::string fusedNodeOp; // Operation name of resulting fused node.
std::vector<int> fusedNodeInputs; // Inputs of fused node.
};
void simplifySubgraphs(const Ptr<ImportGraphWrapper>& net,
const std::vector<Ptr<Subgraph> >& patterns);
}} // namespace dnn, namespace cv
#endif // __OPENCV_DNN_GRAPH_SIMPLIFIER_HPP__
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