utils.cc

//   Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
//
// 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.

#include "utils.h"

namespace DeepES {

bool compute_centered_ranks(std::vector<float> &reward) {
  std::vector<std::pair<float, int>> reward_index;
  float gap = 1.0 / (reward.size() - 1);
  float normlized_rank = -0.5;
  int id = 0;
  for (auto& rew: reward) {
    reward_index.push_back(std::make_pair(rew, id));
    ++id;
  }
  std::sort(reward_index.begin(), reward_index.end());
  for (int i = 0; i < reward.size(); ++i) {
    id = reward_index[i].second;
    reward[id] = normlized_rank;
    normlized_rank += gap;
  }
  return true;
}

}//namespace