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/*
* Copyright (c) 2020 Arm Limited.
*
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef SRC_CORE_HELPERS_SOFTMAXHELPERS_H
#define SRC_CORE_HELPERS_SOFTMAXHELPERS_H
#include "arm_compute/core/Types.h"
namespace arm_compute
{
namespace softmax_helpers
{
/** Given a softmax axis, this function returns the permutation vector required to put the axis to the front
*
* @note This function assumes a tensor rank <= 4
*
* Axis selects the dimension on which softmax is performed.
* E.g. For input of shape 4x5x6 and axis=1, softmax will be applied to 4x6=24 vectors of size 5.
* Interally softmax kernels is always performed on the first dimension (front dimension), therefore permutation is
* required to put the dimension specified by @p axis to the first dimension.
*
* @param[in] axis Axis on which to perform softmax. Supported: 1, 2, 3 (0 implies no permutation needed)
*
* @return the permutation vector
*/
PermutationVector get_permutation_vector_from_softmax_axis(size_t axis);
} // namespace softmax_helpers
} // namespace arm_compute
#endif /* SRC_CORE_HELPERS_SOFTMAXHELPERS_H */
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