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/*
* Copyright (c) 2018 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.
*/
#include "util/Padding.h"
#include <algorithm>
namespace neurun
{
namespace util
{
Padding valid_padding(void)
{
//
// ANEURALNETWORKS_PADDING_VALID
//
// VALID padding. No padding.
//
// When the input size is not evenly divisible by the filter size,
// the input at the end that could not fill the whole filter tile
// will simply be ignored.
//
Padding padding;
padding.top = 0;
padding.bottom = 0;
padding.left = 0;
padding.right = 0;
return padding;
}
Padding same_padding(const nnfw::misc::feature::Shape &ifm_shape,
const nnfw::misc::feature::Shape &ofm_shape, const Stride &stride, uint32_t kw,
uint32_t kh)
{
Padding padding;
// ANEURALNETWORKS_PADDING_SAME (from NNAPI spec)
//
// SAME padding. Padding on both ends are the "same":
//
// padding_to_beginning = total_padding / 2
// padding_to_end = (total_padding + 1)/2.
//
const int32_t vertical_needed_input = (ofm_shape.H - 1) * stride.vertical + kh;
const int32_t vertical_total_padding = std::max(0, vertical_needed_input - ifm_shape.H);
const int32_t horizontal_needed_input = (ofm_shape.W - 1) * stride.horizontal + kw;
const int32_t horizontal_total_padding = std::max(0, horizontal_needed_input - ifm_shape.W);
padding.top = vertical_total_padding / 2;
padding.bottom = (vertical_total_padding + 1) / 2;
padding.left = horizontal_total_padding / 2;
padding.right = (horizontal_total_padding + 1) / 2;
return padding;
}
} // namespace util
} // namespace neurun
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