NEStackLayerKernel.h

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/*
 * Copyright (c) 2018-2021 Arm Limited.
 *
 * SPDX-License-Identifier: MIT
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 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
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 * The above copyright notice and this permission notice shall be included in all
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#ifndef ARM_COMPUTE_NESTACKLAYERKERNEL_H
#define ARM_COMPUTE_NESTACKLAYERKERNEL_H
 
#include "arm_compute/core/Types.h"
#include "src/core/NEON/INEKernel.h"
 
namespace arm_compute
{
class ITensor;
 
/** Basic kernel to stack a rank-R tensor into one with rank-(R+1) along the axis dimension. */
class NEStackLayerKernel : public INEKernel
{
public:
    const char *name() const override
    {
        return "NEStackLayerKernel";
    }
    /** Default constructor */
    NEStackLayerKernel();
    /** Prevent instances of this class from being copied (As this class contains pointers) */
    NEStackLayerKernel(const NEStackLayerKernel &) = delete;
    /** Prevent instances of this class from being copied (As this class contains pointers) */
    NEStackLayerKernel &operator=(const NEStackLayerKernel &) = delete;
    /** Allow instances of this class to be moved */
    NEStackLayerKernel(NEStackLayerKernel &&) = default;
    /** Allow instances of this class to be moved */
    NEStackLayerKernel &operator=(NEStackLayerKernel &&) = default;
    /** Default destructor */
    ~NEStackLayerKernel() = default;
    /** Initialise the kernel's inputs and output
     *
     * @note Supported input tensor rank: up to 4
     *
     * @param[in]  input       Input tensor. Data types supported: All
     * @param[in]  axis        The dimension to stack the tensors along. It must be smaller than the number of input dimensions.
     * @param[in]  idx_input   Index of the input tensor in the list of tensors to stack.
     *                         All tensors in the list must have the same shape
     * @param[in]  num_tensors Number of tensors to stack
     * @param[out] output      Output tensor. Data types supported: Same as @p input.
     *
     */
    void configure(const ITensor *input, unsigned int axis, unsigned int idx_input, unsigned int num_tensors, ITensor *output);
    /**  Static function to check if given info will lead to a valid configuration of @ref NEStackLayerKernel
     *
     * @note Supported input tensor rank: up to 4
     *
     * @param[in] input       Input tensor info. Data types supported: All
     * @param[in] axis        The dimension to stack the tensors along. It must be smaller than the number of input dimensions.
     * @param[in] idx_input   Index of the input tensor in the list of tensors to stack
     *                        All tensors in the list must have the same shape
     * @param[in] num_tensors Number of tensors to stack
     * @param[in] output      Output tensor info. Data types supported: Same as @p input.
     *
     * @return a status
     */
    static Status validate(const ITensorInfo *input, unsigned int axis, unsigned int idx_input, unsigned int num_tensors, const ITensorInfo *output);
 
    // Inherited methods overridden
    void run(const Window &window, const ThreadInfo &info) override;
 
private:
    const ITensor *_input;
    ITensor       *_output;
    unsigned int   _axis;
    unsigned int   _idx_input;
};
} // namespace arm_compute
#endif /* ARM_COMPUTE_NESTACKLAYERKERNEL_H */