wehub-resource-sync
62 lines
2.4 KiB
C++
62 lines
2.4 KiB
C++
// 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"
|
|
#include "paddle/phi/infermeta/unary.h"
|
|
|
|
namespace phi {
|
|
|
|
/**
|
|
* @brief If ``x`` is a vector (1-D tensor), a 2-D square tensor with the
|
|
* elements of ``x`` as the diagonal is returned.
|
|
* If ``x`` is a matrix (2-D tensor), a 1-D tensor with the diagonal
|
|
* elements of ``x`` is returned.
|
|
*
|
|
* The argument ``offset`` controls the diagonal offset:
|
|
* If ``offset`` = 0, it is the main diagonal.
|
|
* If ``offset`` > 0, it is superdiagonal. If ``offset`` < 0,
|
|
* it is subdiagonal.
|
|
* @param ctx device context
|
|
* @param x The input tensor. Its shape is either 1-D or 2-D.
|
|
* @param offset The diagonal offset. A positive value represents
|
|
* superdiagonal, 0 represents the main diagonal, and a
|
|
* negative value represents subdiagonal.
|
|
* @param padding_value Use this value to fill the area outside the specified
|
|
* diagonal band. Only takes effect when the input is a
|
|
* 1-D Tensor. The default value is 0.
|
|
* @param out The output tensor. A square matrix or a vector.
|
|
*/
|
|
template <typename T, typename Context>
|
|
void DiagKernel(const Context& dev_ctx,
|
|
const DenseTensor& x,
|
|
int offset,
|
|
float padding_value,
|
|
DenseTensor* out);
|
|
|
|
template <typename T, typename Context>
|
|
DenseTensor Diag(const Context& dev_ctx,
|
|
const DenseTensor& x,
|
|
int offset,
|
|
float padding_value) {
|
|
DenseTensor dense_out;
|
|
MetaTensor meta_out(&dense_out);
|
|
DiagInferMeta(x, offset, padding_value, &meta_out);
|
|
DiagKernel<T, Context>(dev_ctx, x, offset, padding_value, &dense_out);
|
|
return dense_out;
|
|
}
|
|
|
|
} // namespace phi
|