EVOLUTION-MANAGER

Edit File: tensor_slice_set.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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==============================================================================*/

// A class to manage slices of a tensor. You can "register" set of slices for a
// tensor and then "query" if we have data for a given slice.

#ifndef TENSORFLOW_CORE_UTIL_TENSOR_SLICE_SET_H_
#define TENSORFLOW_CORE_UTIL_TENSOR_SLICE_SET_H_

#include <string>  // for string
#include <unordered_map>
#include <vector>

#include "tensorflow/core/framework/tensor_shape.h"
#include "tensorflow/core/framework/tensor_slice.h"
#include "tensorflow/core/framework/types.h"
#include "tensorflow/core/lib/core/status.h"       // for Status
#include "tensorflow/core/lib/core/stringpiece.h"  // for StringPiece
#include "tensorflow/core/platform/types.h"        // for int64

namespace tensorflow {

namespace checkpoint {

class TensorSliceSet {
 public:
  TensorSliceSet(const TensorShape& shape, DataType type);
  virtual ~TensorSliceSet();

const TensorShape& shape() const { return shape_; }
  const DataType type() const { return type_; }

// Register a new slice for the tensor. The "tag" is an arbitrary string
  // associated with the slice (in one application it denotes the name of the
  // file that contains the slice); the "data" points to the data of the tensor
  // slice (it can be a nullptr).
  Status Register(const TensorSlice& slice, const string& tag);

// Alternative way of querying about a new slice: instead of copying the
  // data, it returns a list of meta data about the stored slices that will
  // supply data for the slice.
  bool QueryMeta(
      const TensorSlice& slice,
      std::vector<std::pair<tensorflow::TensorSlice, string>>* results) const;

struct SliceInfo {
    TensorSlice slice;
    const string tag;
    int64 num_floats;
  };

// Returns the map from slice string to SliceInfo.
  const std::unordered_map<string, SliceInfo>& Slices() const {
    return slices_;
  }

private:
  const TensorShape shape_;
  const DataType type_;
  // We maintain a mapping from the slice string to the slice information.
  std::unordered_map<string, SliceInfo> slices_;

// Minimal slice which contains all presented slices. Used for speeding up
  // overlap check when slices are being added consequently.
  TensorSlice slices_hull_;
};

// Registers "slice" in the TensorSliceSet stored in "tensor_slices", under key
// "name".  Other arguments are used for validations.  Does not modify the map
// or its values on non-OK.
// REQUIRES: tensor_slices != nullptr
Status RegisterTensorSlice(
    const string& name, const TensorShape& shape, DataType type,
    const string& tag, const TensorSlice& slice,
    std::unordered_map<string, TensorSliceSet*>* tensor_slices);

}  // namespace checkpoint

}  // namespace tensorflow

#endif  // TENSORFLOW_CORE_UTIL_TENSOR_SLICE_SET_H_