OneHotEncoder.h

Go to the documentation of this file.

/*
 * Copyright 2023 HEAVY.AI, Inc.
 *
 * 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

#ifndef __CUDACC__

#include "QueryEngine/heavydbTypes.h"
#include "Shared/funcannotations.h"

#include <vector>

namespace TableFunctions_Namespace {

namespace OneHotEncoder_Namespace {

struct OneHotEncodingInfo {
  bool is_one_hot_encoded;
  int32_t top_k_attrs;
  float min_attr_proportion;
  bool include_others_attr;
  std::vector<std::string> cat_features;

  OneHotEncodingInfo() : is_one_hot_encoded(false) {}

  OneHotEncodingInfo(const int32_t top_k_attrs,
                     const float min_attr_proportion,
                     const bool include_others_attr)
      : is_one_hot_encoded(true)
      , top_k_attrs(top_k_attrs)
      , min_attr_proportion(min_attr_proportion)
      , include_others_attr(include_others_attr) {}

  OneHotEncodingInfo(const std::vector<std::string>& cat_features)
      : is_one_hot_encoded(true), cat_features(cat_features) {}
};

template <typename F>
struct OneHotEncodedCol {
  std::vector<std::vector<F>> encoded_buffers;
  std::vector<std::string> cat_features;
};

template <typename F>
NEVER_INLINE HOST OneHotEncodedCol<F> one_hot_encode(
    const Column<TextEncodingDict>& text_col,
    const TableFunctions_Namespace::OneHotEncoder_Namespace::OneHotEncodingInfo&
        one_hot_encoding_info);

template <typename F>
NEVER_INLINE HOST std::vector<OneHotEncodedCol<F>> one_hot_encode(
    const ColumnList<TextEncodingDict>& text_cols,
    const std::vector<
        TableFunctions_Namespace::OneHotEncoder_Namespace::OneHotEncodingInfo>&
        one_hot_encoding_infos);

}  // namespace OneHotEncoder_Namespace

}  // namespace TableFunctions_Namespace

#endif  // #ifndef __CUDACC__