PALRound.h

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/*
 * Copyright (c) 2023 Samsung Electronics Co., Ltd. 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.
 */
 
#ifndef LUCI_INTERPRETER_PAL_ROUND_COMMON_H
#define LUCI_INTERPRETER_PAL_ROUND_COMMON_H
 
namespace luci_interpreter_pal
{
 
inline float RoundToNearest(float value)
{
  auto floor_val = std::floor(value);
  auto diff = value - floor_val;
  if ((diff < 0.5f) || ((diff == 0.5f) && (static_cast<int>(floor_val) % 2 == 0)))
  {
    return floor_val;
  }
  else
  {
    return floor_val + 1.0f;
  }
}
 
inline void Round(const int32_t flat_size, const float *input_data, float *output_data)
{
  for (int i = 0; i < flat_size; ++i)
  {
    // Note that this implementation matches that of tensorFlow tf.round
    // and corresponds to the bankers rounding method.
    // cfenv (for fesetround) is not yet supported universally on Android, so
    // using a work around.
    output_data[i] = RoundToNearest(input_data[i]);
  }
}
 
} // namespace luci_interpreter_pal
 
#endif // LUCI_INTERPRETER_PAL_ROUND_COMMON_H