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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 Object.h
* @ingroup COM_AI_RUNTIME
* @brief This file contains nnfw::misc::tensor::Object class
*/
#ifndef __NNFW_MISC_TENSOR_OBJECT_H__
#define __NNFW_MISC_TENSOR_OBJECT_H__
#include "misc/tensor/Shape.h"
#include "misc/tensor/Index.h"
#include "misc/tensor/IndexIterator.h"
#include "misc/tensor/NonIncreasingStride.h"
#include "misc/tensor/Reader.h"
#include <vector>
namespace nnfw
{
namespace misc
{
namespace tensor
{
/**
* @brief Class to build a tensor using specific generator
* @tparam T Type of tensor element
*/
template <typename T> class Object final : public Reader<T>
{
public:
/**
* @brief Function to generate tensor element
*/
using Generator = std::function<T(const Shape &shape, const Index &index)>;
public:
/**
* @brief Construct a new @c Object object
* @param[in] shape Tensor shape
* @param[in] fn Function to generate tensor elements
*/
Object(const Shape &shape, const Generator &fn) : _shape{shape}
{
// Set 'stride'
_stride.init(shape);
// Handle scalar object
if (shape.rank() == 0)
{
_values.resize(1);
_values.at(0) = fn(_shape, 0);
}
else
{
// Pre-allocate buffer
_values.resize(_shape.dim(0) * _stride.at(0));
// Set 'value'
iterate(_shape) <<
[this, &fn](const Index &index) { _values.at(_stride.offset(index)) = fn(_shape, index); };
}
}
public:
/**
* @brief Get reference of shape
* @return Reference of shape
*/
const Shape &shape(void) const { return _shape; }
public:
/**
* @brief Get and element of tensor
* @param[in] index Index of a tensor element
* @return Value of tensor element
*/
T at(const Index &index) const override { return _values.at(_stride.offset(index)); }
private:
Shape _shape;
NonIncreasingStride _stride;
private:
std::vector<T> _values;
};
} // namespace tensor
} // namespace misc
} // namespace nnfw
#endif // __NNFW_MISC_FEATURE_OBJECT_H__
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