stream.h

#pragma once

#include <torch/csrc/WindowsTorchApiMacro.h>
#include <torch/data/samplers/base.h>
#include <torch/data/samplers/custom_batch_request.h>
#include <torch/types.h>

#include <cstddef>

namespace torch {
namespace serialize {
class InputArchive;
class OutputArchive;
} // namespace serialize
} // namespace torch

namespace torch {
namespace data {
namespace samplers {

struct TORCH_API BatchSize : public CustomBatchRequest {
  explicit BatchSize(size_t size);
  size_t size() const noexcept override;
  operator size_t() const noexcept;
  size_t size_;
};

class StreamSampler : public Sampler<BatchSize> {
 public:
  TORCH_API explicit StreamSampler(size_t epoch_size);

  TORCH_API void reset(optional<size_t> new_size = nullopt) override;

  TORCH_API optional<BatchSize> next(size_t batch_size) override;

  TORCH_API void save(serialize::OutputArchive& archive) const override;

  TORCH_API void load(serialize::InputArchive& archive) override;

 private:
  size_t examples_retrieved_so_far_ = 0;
  size_t epoch_size_;
};

} // namespace samplers
} // namespace data
} // namespace torch