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// Copyright (c) 2022 PaddlePaddle Authors. 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.
#pragma once
#include "paddle/phi/core/dense_tensor.h"
namespace phi {
/**
* @brief Trace Kernel.
* Return the sum along diagonals of the input tensor.
* The behavior of this operator is similar to how `numpy.trace` works.
*
* If Input is 2-D, returns the sum of diagonal.
* If Input has larger dimensions, then returns an tensor of diagonals
* sum, diagonals be taken from the 2-D planes specified by dim1 and
* dim2.
* @param ctx device context
* @param x The input tensor, from which the diagonals are taken
* @param offset offset of the diagonal from the main diagonal.
* Can be bothpositive and negative.
* @param axis1 the first axis of the 2-D planes from which the diagonals
* should be taken. Can be either positive or negative
* @param axis2 the second axis of the 2-D planes from which the diagonals
* should be taken. Can be either positive or negative
* @param out the sum along diagonals of the input tensor
*/
template <typename T, typename Context>
void TraceKernel(const Context& ctx,
const DenseTensor& x,
int offset,
int axis1,
int axis2,
DenseTensor* out);
} // namespace phi