EVOLUTION-MANAGER

Edit File: tensor_id.h

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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http://www.apache.org/licenses/LICENSE-2.0

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distributed under the License is distributed on an "AS IS" BASIS,
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==============================================================================*/

#ifndef TENSORFLOW_CORE_GRAPH_TENSOR_ID_H_
#define TENSORFLOW_CORE_GRAPH_TENSOR_ID_H_

#include <string>

#include "tensorflow/core/graph/graph.h"
#include "tensorflow/core/lib/core/stringpiece.h"
#include "tensorflow/core/lib/hash/hash.h"
#include "tensorflow/core/lib/strings/strcat.h"

namespace tensorflow {

struct SafeTensorId;

// Identifier for a tensor within a step.
// first == operation_name, second == output_index
// Note: does not own backing storage for name.
struct TensorId : public std::pair<StringPiece, int> {
  typedef std::pair<StringPiece, int> Base;

// Inherit the set of constructors.
  using Base::pair;

// NOTE(skyewm): this is required on some platforms. I'm not sure why the
  // using statement above isn't always sufficient.
  TensorId() : Base() {}
  TensorId(const SafeTensorId& id);

const StringPiece node() const { return first; }
  int index() const { return second; }

string ToString() const {
    if (second == Graph::kControlSlot) return strings::StrCat("^", first);
    return strings::StrCat(first, ":", second);
  }

struct Hasher {
   public:
    std::size_t operator()(const TensorId& x) const {
      return Hash32(x.first.data(), x.first.size(), x.second);
    }
  };
};

TensorId ParseTensorName(const string& name);
TensorId ParseTensorName(StringPiece name);

bool IsTensorIdControl(const TensorId& tensor_id);

// Same as TensorId, except owns the backing storage for the op name. This makes
// the memory management simpler at the expense of a copy.
struct SafeTensorId : public std::pair<string, int> {
  typedef std::pair<string, int> Base;

// NOTE(skyewm): this is required on some platforms. I'm not sure why the
  // using "using Base::pair;" isn't always sufficient.
  SafeTensorId() : Base() {}
  SafeTensorId(const string& str, int idx) : Base(str, idx) {}
  SafeTensorId(const TensorId& id);

const string& node() const { return first; }
  int index() const { return second; }

string ToString() const {
    if (second == Graph::kControlSlot) return strings::StrCat("^", first);
    return strings::StrCat(first, ":", second);
  }

struct Hasher {
   public:
    std::size_t operator()(const TensorId& x) const {
      return Hash32(x.first.data(), x.first.size(), x.second);
    }
  };
};

}  // namespace tensorflow

#endif  // TENSORFLOW_CORE_GRAPH_TENSOR_ID_H_