byte_pair_encoding.hpp

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/*
 * Copyright (c) 2022-2023, NVIDIA CORPORATION.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#pragma once
 
#include <cudf/column/column.hpp>
#include <cudf/column/column_view.hpp>
#include <cudf/scalar/scalar.hpp>
#include <cudf/strings/strings_column_view.hpp>
#include <cudf/utilities/default_stream.hpp>
 
namespace nvtext {
 
struct bpe_merge_pairs {
  struct bpe_merge_pairs_impl;
 
  bpe_merge_pairs(std::unique_ptr<cudf::column>&& input,
                  rmm::cuda_stream_view stream        = cudf::get_default_stream(),
                  rmm::mr::device_memory_resource* mr = rmm::mr::get_current_device_resource());
 
  bpe_merge_pairs(cudf::strings_column_view const& input,
                  rmm::cuda_stream_view stream        = cudf::get_default_stream(),
                  rmm::mr::device_memory_resource* mr = rmm::mr::get_current_device_resource());
 
  ~bpe_merge_pairs();
  bpe_merge_pairs();
 
 private:
  friend bpe_merge_pairs_impl const* get_bpe_merge_pairs_impl(bpe_merge_pairs const&);
  bpe_merge_pairs_impl* impl{};  
};
 
std::unique_ptr<bpe_merge_pairs> load_merge_pairs(
  cudf::strings_column_view const& merge_pairs,
  rmm::cuda_stream_view stream        = cudf::get_default_stream(),
  rmm::mr::device_memory_resource* mr = rmm::mr::get_current_device_resource());
 
std::unique_ptr<cudf::column> byte_pair_encoding(
  cudf::strings_column_view const& input,
  bpe_merge_pairs const& merges_pairs,
  cudf::string_scalar const& separator = cudf::string_scalar(" "),
  rmm::mr::device_memory_resource* mr  = rmm::mr::get_current_device_resource());
  // end of group
}  // namespace nvtext