snapshot.h

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#ifndef SINGA_UTILS_SNAPSHOT_H_
#define SINGA_UTILS_SNAPSHOT_H_

#include "singa/io/reader.h"
#include "singa/io/writer.h"
#include "singa/utils/logging.h"
#include "singa/proto/core.pb.h"
#include "singa/core/tensor.h"

#include <string>
#include <unordered_set>
#include <unordered_map>
#include <memory>

namespace singa {
class Snapshot {
 public:
  enum Mode { kRead, kWrite };
  Snapshot(const std::string& prefix, Mode mode, int max_param_size = 10);
  ~Snapshot() {}
  std::vector<std::pair<std::string, Tensor>> Read();
  std::vector<std::pair<std::string, Shape>> ReadShape();
  Tensor Read(const std::string& Key);
  Shape ReadShape(const std::string& key);
  void Write(const std::string& key, const Tensor& param);
  int version() const {
    return version_;
  }

 private:
  int version_ = 0;
  std::string prefix_;
  Mode mode_;
  std::unique_ptr<io::BinFileWriter> bin_writer_ptr_;
  std::unique_ptr<io::Writer> text_writer_ptr_;
  std::unique_ptr<io::BinFileReader> bin_reader_ptr_;
  std::unordered_set<std::string> param_names_;
  std::unordered_map<std::string, Tensor> param_map_;
};
}  //  namespace singa

#endif  //  SINGA_UTILS_SNAPSHOT_H_