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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.
*/
/**
* @file NonIncreasingStride.h
* @ingroup COM_AI_RUNTIME
* @brief This file contains nnfw::misc::tensor::NonIncreasingStride class
*/
#ifndef __NNFW_MISC_TENSOR_NON_INCREASING_STRIDE_H__
#define __NNFW_MISC_TENSOR_NON_INCREASING_STRIDE_H__
#include "misc/tensor/Shape.h"
#include "misc/tensor/Index.h"
#include <vector>
namespace nnfw
{
namespace misc
{
namespace tensor
{
/**
* @brief Class to represent strides where stride[N-1] >= stride[N] holds for all N < rank
*/
class NonIncreasingStride
{
public:
/**
* @brief Initialize the stride data using @c Shape
* @param[in] shape to build stride info
* @return N/A
*/
void init(const Shape &shape)
{
_stride.resize(shape.rank());
_stride.at(shape.rank() - 1) = 1;
for (uint32_t axis = shape.rank() - 1; axis > 0; --axis)
{
_stride.at(axis - 1) = _stride.at(axis) * shape.dim(axis);
}
}
public:
/**
* @brief Get an stride value for specific axis
* @param[in] axis Axis of stride
* @return The value of stride
*/
uint32_t at(uint32_t axis) const { return _stride.at(axis); }
public:
/**
* @brief Get the 1-D offset of specified index for n-D tensor
* @param index @c Index object
* @return 1-D offset of index
*/
uint32_t offset(const Index &index) const;
private:
std::vector<uint32_t> _stride;
};
} // namespace tensor
} // namespace misc
} // namespace nnfw
#endif // __NNFW_MISC_TENSOR_NON_INCREASING_STRIDE_H__
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